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Sci. 11 13 Sofia Bulgaria). Rautschke R. Probleme der spurenanalytik (Martin- Luther-Univ. Sekt. Chem. DDR-4050 Halle/S. Wein- bergweg 16 Germany). Grobenski Z. What did we learn in AAS from ICP and vice versa? (Bodenseewerk Perkin-Elmer GmbH Postfach 10 1 1 64 D-7770 Uberlingen Germany). Laqua K. Glow discharges-versatile excitation sources for optical multi-element spectral analysis of solids (Dort- mund Griiber Weg 2 Germany).Slickers K. A. Spectroflame-ICP-spark ablation system LISA (Spectro Analytical Instruments GmbH D-4190 Kleve Boschstr. 10 Germany). Fodor P. Bertenyi S. Limitations of sample introduction by illustration of grape-products analysis (Univ. Horticul- ture Food Ind. Chem. Dept. 1 1 14 Budapest Villdnyi ut 3 I Gureli L. Albayrak S. Uzmen R. Determination of trace rare earth elements in nuclear fuels (Cekmece Nucl. Res. Training Cent. P K1 Havaalani Istanbul Turkey). Budiir B. Hudnik V. Matrix effects in an argon inductively coupled plasma (Boris KidriE Inst. Chem. Ljubljana Yugoslavia). Gogala A. Can optical emission spectrometry be a self- standing tool in quality assurance? (Litostroj 6 1000 Lju- bljana DjakoviEeva 36 Yugoslavia).Hungary).222R JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY AUGUST 199 1 VOL. 6 9 1x2732. GomiSEek S. Strdko V. Veber M. Preconcentration methods in atomic spectroscopy (Fac. Nat. Sci. Technol. Univ. Ljubljana 6 1000 Ljubljana Murnikova 6 Yugosla- via). 91K2733. Hudnik V. Budit B. Application of ICP atomic emission spectrometry in the analysis of various materials (Boris KidriE Inst. Chem. Lujbljana Yugo- slavia). 91/C2734. Pavloid B. V. Marinkovif; M. D. Recent investigations of the U-shaped DCP source and its applications in spectro- chemical analysis (Fac. Technol. Metall. Univ. Belgrade Karnegijeva 4 1 1000 Belgrade Yugoslavia). 91K2735. Dokkal B. Direct analysis of powdered materials by ICP- OES-suspension sampling technique (Ustav Anal.Chem. CSAV Leninova 82 CS-611 42 Brno Czechoslovakia). 91K2736. Ddekalovh H. D&kal B. Komhk J. Novotny I.,Che- mica1 modifiers for the determination of selenium by graphite furnace AAS (Vqzkumny Ustav. Vet. Ukaistvi Hudcova 70 CS-62 1 32 Bmo Czechoslovakia). 91K2737. Eckschlager K. Properties of spectral methods from the point of view of information theory (Czech. Acad. Sci. Inst. Inorg. Chem. Prague Czechoslovakia). 91lC2738. Feriantllc E. Determination of rare earth elements by ICP- AES in the presence of barite (Geol. Enterprise SpiSskd Novd Ves Czechoslovakia). lC2739. FiSera M. Hladky Z. Rhvh J. Determination of arsenic by ETAAS and elimination of matrix effects (Chem. Works J. Dimitrov 836 05 Bratislava Czechoslovakia)./C2740. Flbritin K. Limiting criteria in spectrography (Fac. Metall. Tech. Univ. KoSice Czechoslovakia. K274 1. Gergely S. Chromium determination by the ICP-OES method using a spectra accumulation technique (Dept. Anal. Chem. Slovak Tech. Univ. Radlinskeho 9 812 37 Bratislava Czechoslovakia). /C2742. Havranovsi H. Determination of sodium in a new additive for unleaded gasoline by flame AAS (Vqskumny ostav pre Ropu a Uhl’ovodikovt Plyvy ViEie Hrdlo 824 17 Bratis- lava Czechoslovakia). 91/C2743. Helsin V. Hetko Z. Loskotovsi I. Analyses of ?tee1 wires on optical emission spectrometers (Tiineckt Zelezdrny s.P. 739 70 Tiinec Czechoslovakia. 9 1x2744. Hlavhtek I. Hlavhtkovai I. Determination of boron in boron-alloyed steels by inductively coupled plasma atomic emission spectrometry (Chem.Lab. Poldi United Steelworks Pnimyslovd ul. 272 62 Kladno Czecho- slovakia). /C2745. HlaviitkovA I. HlavBtek I. Utilization of inductively coupled plasma atomic emission spectrometry (ICP-AES) to analysis of titanium alloys and their master alloys (Chem. Lab. Poldi-SONP United Steelworks Pnimyslova ul. 272 62 Kladno Czechoslovakia). /C2746. Holhyovai G. Mathemy M. Matrix effects in the deter- mination of Cd by the ETAAS method (Dept. Hyg. Epid. Fac. Med. Univ. P. J. SafArik KoSice Czechoslovakia). /C2747. k i c k y V. Toman J. ICP-OES determination of rare earth elements (REE) in their ores and concentrates (UNIGEO State Estab. Lab. Cent. Brno Polni 23/25 Czechoslovakia). /C2748. Kirsch M. Application of ICP spectrometry for routine analyses of metal alloys (Dept.Metall. Inst. Res. Dev. Povaiskt Strojdme Povaiskd Bystrica Czechoslovakia). /C2749. LUiment V. Inter-element correction for boron determina- tion in Fe and Co alloys by ICP-AES (Inst. Phys. SAS Dubravckd casta 9 Bratislava Czechoslovakia). 9 1 ~ 2 7 5 0 . Koller L. Excitation temperature radial distribution in the d.c. arc device by MarinkoviC (Dept. Chem. Tech. Univ. KoSice Czechoslovakia). 91K2751. Kopecky J. Bernas M. Homan J. Tiirk P. Proko- povsi H. Spectral plate evaluation by means of a semi- conductor image sensor (CCD) (CVUT Elektrotech. Fak. Prague Czechoslovakia). 911C2752. KoSiIi M. Korpei t. Feriantik E. Some problems in the determination of rhenium by ICP-AES in geological samples (Geol. Priesk. h i t . Podnik Spiiskd Nova Ves Czechoslovakia).91K2753. Kotrly S. Approaches to the margins of analytical informa- tion limit of detection and limit of determination (Dept. Anal. Chem. Univ. Chem. Technol. 532 10 Pardubice Czechoslovakia). 91/C2754. Krakovskri E. Utilization of a Weta 82 tungsten atomizer for the determination of rare earth elements (Dept. Chem. Tech. Univ. KoSice Czechoslovakia). 91/C2155. Kriirik P. Msisilko R. Mcha S. Determination of some noble metals in waste waters using the Philips PV 8065 emission spectrometer (Lab. At. Spectrom. Inst. Chem. Technol. Prague Czechoslovakia). 9 1/C2756. Martiny E. Medv& J. Rojkovi6 I. Problems of rare earth elements determination in the Permian silicate rocks from the Western Carpathians by atomic spectroscopic methods (Geol.Inst. Slovak Acad. Sci. Bratislava Czechoslovakia). /C2757. Mathemy M. Origination and development of atomic spectrochemistry in Slovakia (Fac. Metall. Tech. Univ. KoSice Czechslovakia). K2758. Musil J. Direct analysis of the ‘difficult’ biological samples by means of ICP-AES (Inst. Landscape Ecol. CSAV Ceskt Budiijovice Czechoslovakia). /C2759. Nevoral V. Determination of traces of vanadium in mineral waters (Inst. Balneolog. Res. Czechoslovakia). 91K2760. Paukert T. RubeSka I. Weiss D. Determination of REE by ICP optical emission spectrometry after organic solvent extraction (Geol. Surv. Prague MaIostranske n. 19 1 182 1 Prague 1 Czechoslovakia). 9 1x276 1. PlieBovsksl N. hltt!s P. Correlation study of internal standardization in inductively coupled plasma atomic emission spectrometry (Fac.Metall. Tech. Univ. KoSice Czechoslovakia). 9 1/C2762. Polakovitovh J. Kubovd J. Some problems of determina- tion of Ta Nb Hf and Zr in geological samples by ICP- OES (Geol. Inst. Fac. Natl. Sci. Komensky Univ. Mlynskd Dolina 842 1 5 Bratislava Czechoslovakia). 9 1/C2763. ReitznerovA E. Determination of trace elements As Bi Pb Sb and Sn in high quality copper by AAS method (Res. Lab. Metal Mater. Tech. Univ. KoSice Czechoslovakia). 91K2764. RiSovh J. Hladkf Z. FiSera M. Determination of some essential and trace elements in brain by ICP-OES and AAS methods (Fac. Chem. Technol. Slovak Tech. Univ. Dept. Anal. Chern. Radlinskeho 9 812 37 Bratislava Czecho- slovakia). 91/C2765. Rubeska I. Paukert T. Determination of platinum group elements using fire-assaying with collection into NiS but- tons (Geol.Surv. Prague Malostranske n. 19 1 182 1 Prague 1 Czechoslovakia). 91K2766. Rybkovi g. Situation in the research of rare earth elements according to the bibliographic data in the period 198 1-1 988 (Fac. Metall. Tech. Univ. KoSice Czecho- slovakia). 9 1/C2767. Sokolovh B. Direct determination of trace metals in hydrocracker feed by the ICP-AFS method (Lab. Element. Anal. Dept. Quality Control Slovnaft Bratislava Czecho- slovakia). 911C2768. StreSko V Veber M. GomiSPek S. Determination of trace elements in waters by AAS after on-line preconcentra- tion (Geol. Inst. Fac. Nat. Sci. Komensky Univ. 84215 Bratislava Mlynskd Dolina Czechoslovakia). 9 l/C2769. Zdenek S. Determination of chromium in biological materials by methods of atomic spectroscopy-present situation problems and perspectives (Fac.Agron. Univ. Agric. CS-165 2 1 Prague 6-Suchdol Czechoslovakia). 9 l/C2770. Splhacek R. Method development for determination of lead zinc cadmium and copper in milk and dairy products with graphite furnace atomic absorption spectrometry (Vyskumny Ustav Potravinarsky Bratislava Czecho- slovakia).JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY AUGUST 199 1 VOL. 6 223R 9 l/C277 1. Toman J. ICP-OES in organic solvents (UNIGEO State Establishment Lab. Cent. Brno Polni 23/25 Czecho- slovakia). 9 1x2772. Vida S. F16rih K. Solairikovd M. Testing of the spectral line pairs for the analytical calibration of LMA steels (Res. Testing Inst. East-Slovak. Metall. Works KoSice Czecho- slovakia).91/C2773. Vinklerovd s. Luzar O. Spectroflame-ICP and its utiliza- tion in the laboratory (Res. Inst. NHKG Ostrava Czecho- slovakia). 9 1x2774. bmberyovd M. Vatkovd M. Smirnovd L. Electrothermal atomization of metal chelates for analytical application (Dept. Anal. Chem. Fac. Sci. Komenskjr Univ. 842 15 Bratislava Czechoslovakia). 9 112 775. 91/2776. Jerrow M. Marr I. Cresser M. S. Magnesium as a modifier for the determination of barium in offshore oil- well waters by direct current plasma atomic emission spectrometry and flame atomic absorption spectrometry Analyst 1991 116 141. (Dept. Chem. Univ. Aberdeen Meston Walk Old Aberdeen AB9 2UE UK). Volynsky A. Tikhomirov S. Elagin A. Proposed mecha- nism for the action of palladium and nickel modifiers in electrothermal atomic absorption spectrometry Analyst 1991 116 145.(V.I. Vernadsky Inst. Geochem. Anal. Chem. USSR Academy of Sciences 19 Kosygin St. 1 17975 Moscow USSR). Papers 9 112775-9 1lC2898 were presented at the 199 1 European Winter Conference on Plasma Spectrochemistry Dortmund Germany 14th- 18th January 199 1. 91/C2777. 91/C2778. 91/C2779. 9 1/C2780. 91/C278 1. 91lC2782. 91lC2783. 91lC2784. 9 1 lC278 5. 9 l/C2786. 9 1 lC278 7. 91lC2788. humans P. W. J. M. Signal-to-noise and signal-to- background from confusion to fusion! (Philips Res. Labs. P.O. Box 80.000 5600 JA Eindhoven The Netherlands). Hieftje G. M. Plasma diagnostic techniques for under- standing and control (Indiana Univ. Dept. Chem. Bloom- ington IN 47405 USA). Bol’shov M. A.Applications of laser-induced fluorescence in spectrochemistry (Inst. Spectrosc. USSR Acad. Sci. 142092 Troitzk Moscow USSR). Nickel H. Characterization of metallic and ceramic high- temperature materials for energy systems by means of atomic spectroscopy (Forschungszent. Julich GmbH Inst. fur Reaktorwerkstoffe Lehrstuhl Reaktorwerkstoffe Bren- nelemente RWTH Aachen Postfach 19 1 3 5 170 Jiilich Germany). Oechsner H. SNMS-a plasma based method for solids mass spectrometry (Dept. Phys. Inst. Surf. Thin Film Anal. Univ. Kaiserslautern D-6750 Kaiserslautern Germany). Horlick G. Plasma mass spectrometry for elemental analysis (Dept. Chem. Univ. Alberta Edmonton Alberta T6G 2G2 Canada). Mermet J.-M. Sampling of metals for inductively coupled plasma spectrochemistry (Lab.Sci. Anal. Univ. Lyon I 69622 Villeurbanne Cedex France). Sam-Medel A. Role of plasma spectrochemistry in clinical and biological analysis a challenge called speciation (Dept. Phys. Anal. Chem. Fac. Chem. Univ. Oviedo Spain). Pliko E. Evaluation of different approaches to correction of background and/or spectral interferences (Geol. Inst. Comenius Univ. Mlynskfi Dolina 842 15 Bratislava Czechoslovakia). Berndt H. Schaldach G. Hydraulic high pressure nebuli- zation a new aerosol generation and an on-line sample pretreatment system (Inst. Spektrochem. angew. Spek- trosc. Bunsen Kirchhoff Str. 11 D-4600 Dortmund Ger- many). Dittrich K. Nagora B. Niebergall K. Matrix interference in ETV-ICP-AES (Univ. Leipzig Sect. Chem. Anal. Cent. Leipzig 0 70 10 Germany). Satyanarayana H.Sikoo B. M. Determination of rare earth elements (REE) yttrium and scandium in geological materials and rare earth concentrates using inductively coupled plasma emission spectrometry (Chem. Lab. At. 91/C2789. 9 1lC2790. 91K2791. 91x2792. 91lC2793. 9 1lC7294. 91K2795. 91lC2796. 9 1x2797. 9 1 K279 8. 91x2799. 9 1 /C2800. 91lC2801. 91fC2802. 91lC2803. 9 1/C2804. 91lC2805. Min. Div. Dept. At. Energy Begumpet Hyderabad 5000 16 India). Zairav Gv. -tor T. Derecskei B. Direct analysis of aluminium oxide using an ETVD-ICP method with gaseous halogenization (Eotvos Univ. Budapest Hungary Tech. Univ. Budapest Hungary). Cassagne P. Johnson T. J. Routh M. W. Selection of analytical lines for use in inductively coupled plasma atomic emission spectrometry-a novel approach to the way out of the nightmare (ARL Appl.Res. Lab. En Vallaire CH- 1024 Ecublens Switzerland). Steffan I. Vujicic G. Influence of alcohols on plasma discharge performances (Inst. Anal. Chem. Univ. Vienna A-1090 Vienna Waenringerstr. 38 Austria). Montaser A. Clifford R. H. Sohal P. Dual-beam light- scattering interferometry for simultaneous measurements of droplet-size and velocity distributions of aerosols produced by new ultrasonic nebulizers (Dept. Chem. George Wash- ington Univ. Washington DC 20052 USA). van Voen F. H. de Loos-Vollebregt M. T. C. Power of Kalman filtering for data reduction in ICP-AES (Lab. Anal. Chem. Delft Univ. Technol. de Vries van Heystplantsoen 2 2638-RZ Delft The Netherlands). Yang J.-f. Zeng X.-j. Matrix interferences from elements with different ionization potentials in inductively coupled plasma atomic emission spectrometry (Changchun Inst.Appl. Chem. Acad. Sin. Changchun 130022 China). Moenke-Blankenburg L. Giinther D. Schumann T Quantification in LM-ICP-AES (Martin-Luther-Univ. Halle-Wittenberg Dept. Chem. Weinbergweg 16 0-4050 Halle/S Germany). Sansoni B. Panday V. K. Present state of instrumental multi-element analysis by ICP atomic fluorescence spectro- metry with hollow cathode lamp excitation (Dept. Chem. Anal. Res. Cent. Julich GmbH D-5170 Julich-1 Ger- many). Vertes A Baiazs L. Gijbels R. Crater and plume formation in laser-solid interaction (Univ. Antwerp Dept. Chem. Univ. l. B-2610 Wilrijk Belgium). Steers E. B. M. Leis F. Excitation processes in a Grimm-type glow discharge lamp with and without supple- mentary microwave excitation (DECAP Polytech North London Holloway London N7 6DB UK).Winchester M. R. Marcus R. K. Emission characteristics of a pulsed r.f. glow discharge atomic emission source (Dept. Chem. Howard L. Hunter Chem. Labs. Clemson Univ. Clemson SC 29634- 1905 USA). Ronan G. Clark J. Wheeler D. The use of magnetically confined electron beam enhanced glow discharge for the direct bulk analysis of insulating and conducting samples (VG MicroTrace Ion Path Rd. Three Winsford Cheshire CW7 3BX UK). Sommer D. Grunenberg D. Koch K. H. SNMS and GD- OES for steel surface analysis a comparative study (Hoesch Stahl AG Postfach 10 50 42 D-4600 Dortmund Ger- many). Hunault P. Le Marchand A Brenner I. S. Recent developments in GD-ES instrumentation and methodology for bulk and surface analysis (Jobin Yvon (ISA) 16-18 Rue du Canal Longjumeau Cedex 91 163 France).Xhoffer C. Van Borm W. Van Grieken R. Jacob W. Broekaert J. Study of exhaust aerosols in slurry nebuliza- tion inductively coupled plasma atomic spectrometry for ceramic powders (Dept. Chem. Univ. Antwerp (ULA) Universiteitsplein 1 B-26 10 Antwerp-Wilrijk Belgium). Kuss H.-M. Mueller M. Bossmann D. Trace element determination in steel samples by means of ICP-MS (Univ. Duisburg Dept. Anal. Chem. Duisburg Germany). Jakubowski N. Feldmann I. Stuewer D. Berndt H. Schaldach G. Hydraulic high pressure nebulization-ap- plication of a new nebulization system for ICP-MS (Inst. Spektrochem. Angew. Spektrosk. Postfach 10 13 52 D- 4600 Dortmund 1 Germany).224R JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY AUGUST 1 99 1 VOL.6 91/C2806. Okamoto Y. Shimam S. High sensitivity microwave- induced plasma mass spectrometry for trace element analy- sis (Cent. Res. Lab. Hitachi Kokubunji Tokyo 185 Japan). 9 1/C2807. Vzlllkopf U. Analysis of solid microsamples using ETV- ICP-MS (Bodenseewerk Perkin-Elmer GmbH D-7770 herlingen Postfach 10 1 1 64 Germany). 91/C2808. Sullivan J. J. Quimby B. D. Bandemer T. Stable isotopes in gas chromatography using an atomic emission detector (Hewlett-Packard P. 0. Box 900 Avondale PA 1931 1 USA). 9 1 /C2809. Shuttleworth S. Spatially resolved elemental analysis of ceramic materials by LA-ICP-MS (VG Elemental Ion Path Rd. Three Winsford Cheshire CW7 3BX UK). 91/C28 10. Horlick G.Stewart M. Automated solution sample preparation for inductively coupled plasma spectrometry (Dept. Chem. Univ. Alberta Edmonton Alberta T6G 2G2 Canada). 91/C28 11. Brill M. Heraeus W. C. Cassagne P. High precision measurements in the precious metals industry with induc- tively coupled plasma atomic emission spectrometry (Her- aeusstrasse 12-1 4 D-6450 Hanau 1 Germany). 9 K 2 8 12. Wok Ad. Uitbeijerse E. Inorganic multi-element analysis using inductively coupled plasma atomic emission spectro- metry according to the contract laboratory program (CLP) quality control regulations (Baird Europe B.V. Produk- tieweg 30 2382 PC Zoeterwoude The Netherlands). 91K2813. LobirIski R. Broekaert J. A. C. Tschgpel P. Inductively coupled plasma atomic emission spectroscopic determina- tion of trace impurities in Zr02 powder (Max-Planck Inst.Metallforsch. Lab. Reinststoffanal. D-4600 Dortmund 1 Germany). 9 1x28 14. Revesz R. Hasty E. Microwave sample preparation utilizing temperature feedback control (CEM P.O. Box 200 Matthews NC 28 106 USA). 91/C2815. Brenner I. B. Le Marchand A. Optimization of intensity measurement and acquisition in multi-element sequential analysis by ICP-AES-variable resolution and mathemati- cal modes of measurement drastically improves S/B ratios (Jobin Yvon (ISA) 16-18 Rue du Canal Longiumeau Cedex 9 1 163 France. 91/C2816. Brenner I. B. Gautherin J. C. Le Marchand A. Lavenir E. Samuel O. Lagave X. Rapid analysis of complex materials by ICP-AES-application of elemental tracers for rapid analysis of high solid and viscous materials (Jobin Yvon (ISA) 16-18 Rue du Canal Longiumeau Cedex 9 1 163 France).91/C2817. Campbell M. Vandecasteele C. Dams R. Application of isotope dilution techniques to the accurate and precise determination of lead in reference materials by inductively coupled plasma source mass spectrometry (Lab. Anal. Chem. Univ. Gent Inst. Nuc. Sci. Proef- tuinst. 86 B-9000 Gent Belgium). 91/C2818. C a d M. Mermet J.-M. Considerations of the practical determination of limits of detection in inductively coupled plasma atomic emission spectrometry (Lab. Sci. Anal. Univ. Lyon I 69622 Villeurbanne Cedex France). 91K2819. Dixon A. Gregson D. Hutton R. C. Potter D. Normali- zation of mass response function in ICP-MS (VG Elemen- tal Ion Path Rd. Three Winsford Cheshire CW7 3BX UK).9K2820. Ediger R. D. Fredeen K. J. Automatic interpretation of ICP-MS spectra using heuristic-based methods (Perkin- Elmer 761 Main Ave. Norwalk CT 08659-0219 USA). 91X2821. Eid M. A. Fakhry A. A. Eid K. A. Broekaert J. A. C. Selection of analysis lines for spectrometric determination of REE in phosphates (Phys. Dept. Natl. Res. Cent. Dokki Cairo Egypt). 91IC2822. Fecher P. ICP emission with an ultrasonic nebulizer-a routine tool for analysing food samples? (Landesuntersu- chungsamt Gesundeit. Nordbayern Henkestrasse 9- 1 1 8520 Erlangen Germany). 91/C2823. Fredeen K. J. Denoyer E. R. Hager J. W. Laser sampling ICP-MS methods development strategies (Perkin-Elmer 761 Main Ave. Norwalk CT 06859-0219 USA). 91/C2824. Horlick G. Qin F. Characterization of high frequency signal fluctuations in inductively coupled plasma atomic emission spectrometry (Dept.Chem. Univ. Alberta Ed- monton Alberta T6G 2G2 Canada). 91/C2825. Chomet S. Trassy C. Imbert J. L. Study of alkaline interference at low concentration in ICP by optical spectros- copy and mass spectroscopy (Sew. Cent. D’anal. CNRS-BP 22-6930 Vernaison France). 91/C2826. Ivaldi J. C. Slavin W. Analytical testing procedures for inductively coupled plasma atomic emission spectrometry (Perkin-Elmer 76 1 Main Ave. Norwalk CT 06859-0237 USA). 91/C2827. Montaser A. Tan H. Ishii I. Nam H. Analytical and fundamental characteristics of the Delsi-Nermag mass spectrometer interfaced to a versatile ICP system (Dept. Chem. George Washington Univ. Washington DC 20052 USA).91/C2828. Niilte J. Applications of a flow injection device for sequential ICP instruments (Bodenseewerk Perkin-Elmer GmbH Postfach 10 11 64 D-7770 ijberlingen Germany). 91IC2829. Routh M. W. Cassagne P. Johnson T. J. Influence of sample introduction temperature stabilization in ICP-AES (ARL Applied Research Laboratories En Vallaire CH- 1024 Ecublens Switzerland). 91K2830. Samuel O. Gautherin J. C. Le Marchand A. Wallerand C. -re E. Polyscan ICP spectrometers-scanning poly- chromators for problem solving in multi-element analysis (Jobin Yvon (ISA) 16-18 Rue du Canal Longjumeau Cedex 9 1 163 France). 91/C2831. Goudzwaard M. P. de Loos-Vollebregt M. T. C. Charac- terization of noise in inductively coupled plasma atomic emission spectrometry (Delft Univ. Technol. Lab.Anal. Chem. De Vries van Heystplantsoen 2,2628 RZ Delft The Netherlands). /C2832. Verrept P. Vandecasteele C. Dams R. Electrothermal vaporization for sample introduction in ICP-AES with automatic background correction (Lab. Anal. Chem. Inst. Nucl. Sienc. Univ. Ghent Proefruinstraat 86 B-9000 Gent Belgium). /C2833. Rudolph O. Wundrack A. Low-noise high sensiti- vity-atomic emission spectroscopy with TEP-excitation source (Gesellschaft Anal. Atomspektrosk. Me0 technik mbH Am Bahnnof 413315 Bad Durrenberg 0-4203 Ger- many). /C2834. Walsh A. Analysis of difficult matrices by high resolution ICP-MS (VG Elemental Ion Path Rd. Three Winsford Cheshire CW7 3BX UK). K2835. Yang J.-f. Piao Z.-x. Zeng X.-j Studies on derivative techniques in inductively coupled plasma atomic emission spectrometry (Changchun Inst.Appl. Chem. Acad. Sin. Changchun 130022 China). 91/C2836. Yates D. A. Fredeen K. J. Salit M. L. Collins J. B. Automated background Correction techniques in ICP spec- troscopy (Perkin-Elmer 76 1 Main Ave. Norwalk CT 91/C2837. Denoyer E. R. Fredeen J. Application of laser sampling ICP-mass spectrometry to environmental analysis (Perkin- Elmer 761 Main Ave. Norwalk CT 06859-0219 USA). 9 1/C2838. Gercken B. Barnes R. M. Combination of size exclusion chromatography and ICP-MS for blood speciation analysis of lead and other trace elements (Dept. Chem. Univ. Massachusetts GRC Towers Amherst MA 01003 USA). 9 1 /C2839. Scholze H. Stephanowitz H. Hoffmann B. Determina- tion of B Al Si Zn Mo and W in concentrated alcalic solutions with an ICP spectrometer Spectro- flame (Inst.Chem. Technol. Rudower Chaussee 5 0- 1 199 Berlin Germany). 91K2840. Tang Y.-o. Du Y. Zhu M.-h. Shao J.-c. Liu C. Air-argon ICP for organic solution analysis spectro- 06859-02 19 USA).JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY AUGUST 199 1 VOL. 6 225R scopic characters and analytical proformance (East China Inst. Chem. Technol. Anal. Res. Center Shanghai 200237 China). 9 1/C284 1. Feldmann I. Jakubowski N. Stuewer D. Improvement of pneumatic nebulization in ICP-MS by desolvation (Inst. Spektrochem. Angew. Spectroskop. Postfach 10 13 52 D- 4600 Dortmund 1 Germany). 911C2842. BelQzs L. Vertes A. Gijbels R. Absorption and emission mechanisms in laser generated plumes (Univ. Antwerp Dept. Chem. Universiteitsplein 1 B-26 10 Wilrijk Bel- gium).9 1x2843. Bol’shakov A. A. Golovenkov N. V. Laser-induced fluores- cence analysis of inorganic species in the gaseous phase (Inst. Phys. Leningrad State Univ. Petrodvorets Lenin- grad 198904 USSR). 9 VC2844. Bol’shakov A. A. Golovenkov N. V. Stepwise plasma-laser fluorescence detection of gas impurities (Inst. Phys. Lenin- grad State Univ. Petrodvorets Leningrad 198904 USSR). 91lC2845. Broekaert J. A. C. Brushwyler K. R. Bricker T. Hieftje G. M. Investigations at a jet-assisted glow discharge lamp for optical emission spectrometry (Indiana Univ. Dept. Chem. Bloomington IN 47405 USA). 91/C2846. Clark J. Ronan G. Greb U. Wheeler D. The effects of cryo-cooling and plasma cell geometry on the performance of GDMS (VG Microtrace Ion Path Rd.Three Winsford Cheshire CW7 3BX UK). 9K2847. Eberhardt K. Buchert G. Hermann G. Trautmann N. Microwave-induced plasma operated at atmospheric and low pressure as an ion source for a mass separator (Inst. Kernchemie Univ. Mainz Fritz-StraBmann-Weg 2 D- 6500 Mainz Germany). 91K2848. Fujimori H. Matsui T. Izumi S. Hsueh Y. M. Detection of fine particles in liquids by a laser breakdown method (Energy Res. Lab. Hitachi 1 168 Moriyama Hitachi Ibarak 3 16 Japan). /C2849. HergenrMer R. Niemax K. Continuous wave field ioniza- tion laser spectroscopy (Inst. Spektrochem. angew. Spec- trosk. (ISAS) D-4600 Dortmund 1 Germany). /C2850. Hunault P. Chewier M. Passetemps R. Application of GD-ES (glow discharge emission spectrometry) for the direct analysis of non-conducting materials and coatings (16-18 Rue du Canal Longjumeau Cedex 91 163 France)./C285 1. Jenett H. Effects of instrumental parameters on quantifica- tion and depth resolution in secondary neutral mass spectrometry (Inst. Spektrochem. angew. Spektrosk. Post- fach 101352 D-4600 Dortmund 1 Germany). 91lC2852. BNS~ J. Uebbing J. Sdorra W. Leis F. Niemax K. OES measurements at laser-produced plasmas re-heated by a second pulse laser (Inst. Spektrochem. Angew. Spektros- kop. Bunsen-Kirchhoff-Str. 1 1 D-4600 Dortmund 1 Ger- many). 91/C2853. Lunvov 0. S. Maximov D. E. Oshemkov S. V. Rud- nevsky A. N. Determination of metal traces by laser- excited fluorescence method with hot hollow cathode atomization (Inst. Phys. Leningrad Univ. Leningrad USSR). 91K2854. Lazik C. Marcus R. K.Influence of anode geometry in radiofrequency glow discharge emission spectrometry (Dept. Chem. Howard L. Hunter Chem. Labs. Clemson Univ. Clemson SC 29634-1905 USA). 91/C2855. Cable P. R. Marcus R. K. Ion sampling considerations for an r.f. glow discharge source with external sample mount geometry (Dept. Chem. Howard L. Hunter Chemical Labs. Clemson Univ. Clemson SC 29634-1905 USA). 91/C2856. Milton D. Raith A. Ronan G. Analysis of metals and alloys using quadrupole-based glow discharge mass spectro- metry (VG MicroTrace Ion Path Rd. Three Winsford Cheshire CW7 3BX UK). 91K2857. Funtov V. N. Nemets V. M. Petrov A. A. Soloviov A. A. Peculiarities of the isotope composition spectroscopic de- tection in a gas discharge plasma (Inst. Phys Leningrad Univ. Leningrad 198904 USSR).9K2858. van Straaten M. Vertes A. Gijbels R. Modelling of atomization processes in a glow discharge ionization cell (Univ. Antwerp Dept. Chem. Universiteitsplein 1 B-26 10 Wilrijk Belgium). 911C2859. Ronan G. Milton D. Wheeler D. Raith A. Quantitative depth profile analysis using the VG GloQuad (VG Micro- Trace Ion Path Rd. Three Winsford Cheshire CW7 3BX UK). 91/C2860. Vieth W. Huneke J. C. Influence of source configuration and discharge conditions on GDMS analytical perform- ance (Charles Evans & Associates 301 Chesapeake Dr. Redwood City CA 94063 USA). 911C2861. Del Monte Tamba M. G. Tomellini R. Lo Piccolo E. Study of the kinetics of sputtering of pure metals and alloys under glow discharge conditions (Cent. Sviluppo Mater. Via Caste1 Romano 100-102 00129 Rome Italy).91/C2862. Miller K.-H. Beckmann B. Oechsner H. Analysis of insulating materials by the high frequency mode of secon- dary neutral mass spectrometry (Dept. Phys. Inst. Surf. Thin Film Anal. Univ. Kaiserslautern D-6750 Kaiserslau- tern Germany). 911C2863. Hoffmann E. Liidke Ch. Skole J. Simultaneous multi- element determination of toxic elements in airborne dust by FANES (Cent. Inst. Opt. Spectrosc. Berlin Germany). 91/C2864. Kisnimote T. Wenzel N. GroBe-Wilde F. Liipke G. Marowsky G. Investigation of C02 laser plasmas by coherent anti-Stokes Raman scattering (CARS) (Siemens AG Forschungslab. D-8520 Erlangen Germany). 91/C2865. Pangav V. K. Dadmun J. T. Sansoni B. Instrumental multi-element analysis by ICP atomic fluorescence using hollow cathode lamps influence of mineral acid and salt concentration (Cent.Lab. Chem. Anal. Res. Cent. Julich Postfach 19 13 D-5 1 70 Julich Germany). 9 1/C2866. Gunther D. Kammel J. Moenke-Blankenburg L. LM- ICP-AES-tandem technique for direct solid analysis of conducting and non-conducting materials (Martin-Luther- Univ. Halle-Wittenberg Dept. Chem. Weinbergweg 16,O- 4050 Halle Germany). 91/C2867. Wennrich R. Niebergall K. Nguyen H. Th. Dittrich K FANES and ICP-AES with laser ablation REE analysis in solid samples (Univ. Leipzig Sekt. Chem. WB Analytik Talstr. 35 0-70 10 Germany). 91K2868. Hoffmann V. Jaknbowski N. Stahlberg U. Stuewer D. Investigations comparing the analysis of massive and compacted metallic materials by glow discharge mass spectrometry (GDMS) (Inst.Spektrochem. Angew. Spek- troskop. Postfach 10 13 52 W-4600 Dortmund 1 Ger- many). 9 1 /C2869. Gries W. Siipitz W. Tilch J. Laser-excited atomic fluorescence spectrometry-application to the determina- tion of palladium (Laser Anal. Res. Tempelhofer Ufer 23-24 W- 1000 Berlin 6 1 Germany). 9 1 /C2870. Bauer G. Wegscheider W. Ortner H. M. Estimation of errors and limits of detection in ICP-OES using univariate and multivariate calibration (Inst. Anal. Chem. Micro- Radiochem. Graz Univ. Technol. Technikerstrasse 4 A- 80 10 Graz Austria). 9 1 /C287 1. Bliidorn W. Burba P. Jiiger H. Trace element determina- tion in contaminated soil solutions and landfill leachates by atomic spectrometry a comparison of different preconcentration procedures (Spectro Anal. In- strum. Kleve Germany).91/C2872. Miema J. Ramsza A. P. Investigation of some analytical parameters and spectral characteristics of MIP spectrome- try with wet aerosol introduction (Cent. Lab. M.C.S. Univ. 20-03 1 Lublin Poland). 91/C2873. Senron H. ICrieg M. Wienke D. Improvement of the detection limits for the trace element determination in A1203 by thermochemical reactions and nonlinear blank correction (Friedman-Schiller Univ. Jena Inst. Anorgan. Anal. Chem. D-0-6900 Jena Germany). 9 1IC2874. Jonkers Ch. Janssens K. Van Espen P. Simultaneous multi-element analysis of steel using glow discharge mass226R JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY AUGUST 1991 VOL. 6 spectrometry (Cent. Micro- Trace Anal. Dept. Chem. Univ. Antwerp Universiteitsplein 1 B-26 10 Wilrijk Bel- gium).9 1/C2875. Niitzold C. Z. Quillfeldt W. ICP-instrument approach with fibre optics PLASMAQUANT 100 (Jenoptik Carl Zeiss JENA GmbH Geschaftsbereich Opt. Anal. 0-6900 Jena Germany). 911C2876. Niebergall F. Wennrich R. Multi-element trace analysis in penicillin G by ICP-AES (Univ. Leipzig Sekt. Chem. WB Anal. Talstr. 35 Leipzig 0 7010 Germany). 911C2877. Chaplygina N. I. Popandopulo Yu. I. Grazhulene S. S. Elimination of the matrix element influence in ICP-OES analysis of high purity Zn and Cd (Inst. Microelectron. Technol. Problems USSR Acad. Sci. 142432 Chernogo- lovka USSR). 911C2878. Caroli S. Violante N. Quaglia M. G. Lopez A. Trace elements as potential markers for identifying the geographi- cal origin of addictive drugs (1st. Super. Sanita Dept.Appl. Toxicol. Viale Regina Elena 299 00161 Rome Italy). 1C2879. Caroli S. Coni E. Fornarelli L. Falconieri P. Assessment of reference values for trace elements in human milk (1st. Super. Sanita Dept. Appl. Toxicol. Viale Regina Elena 299 0016 Rome Italy). 1C2880. Shabani M. B. Masuda A. A study of on-line preconcen- tration of ultra-trace levels of rare earth elements in complex matrices and sea-water using phosphate base complex immobilized on XAD-4 amberlite by means of ICP-MS (Dept. Chem. Fac. Sci. Univ. Tokyo Hongo 113 Tokyo Japan). 911C288 1. Nickel H. Zadgorska Z. Optimization of electrothermal vaporization of impurity elements in Sic powder using inductively coupled plasma atomic emission spectrometry (Inst. Reactor Mater. Res. Cent. Julich P.O. Box 1913 5 170 Julich Germany). 911C2882.Xu L.q. Schramel P. Determination of gold in sludge and soil by sequential ICP after preconcentration and separation with thiol-cotton fibre (Inst. okologische Chem. GSF D- 8042 Neuherberg Germany). 9 11C2883. Wiinsch G. Seubert A. HPLC trace-matrix separation procedures for Mo and W and their use with ICP-OES (Univ. Hannover Inst. Inorg. Chem. Callinstr 9 D-3000 Hannover 1 Germany). 9 1/C2884. Wisbrun R. Niessner R. Laser induced breakdown spec- troscopy for detection of heavy metals in environmental samples (Inst. Water Chem. Tech. Univ. Munich Mar- chioninistr. 17 D-8000 Munchen 70 Germany). 91/C2885. van Veen E. H. Tiggelman J. J. Wassink A. P. Kalter A. Determination of trace elements in uranium by ICP-AES using Kalman filtering (Lab.Anal. Chem. Delft Univ. Technol. de Vries van Heystplantsoen 2 2628 RZ Delft The Netherlands). 9 1K2886. Steffan I. Vujicic G. ICP-AES analysis of non-conductive powders after spark ablation (Inst. Anal. Chem. Univ. Vienna A- 1090 Vienna Waenringerstr. 38 Austria). 9 1 /C2887. Schramel P. Xu L.q. Knapp G. Application of an on-line preconcentration system in simultaneous ICP-AES (Inst. Okologische Chem. GSF D-8042 Neuherberg Germany). 911C2888. Sanz-Medel A. Shchez Uria E. Menendez A. Cotrino J. Quintero M. C. On-line chemical pretreatments for direct and indirect analysis of iodide by plasma atomic emission spectrometry (Dept. Phys. Anal. Chem. Univ. Oviedo Spain). 911C2889. Richts U. Broekaert J. A. C. Tschiipel P. Tiilg G. Comparative study of a Beenakker cavity and a surfatron in combination with electrothermal evaporation from a tung- sten coil for microwave plasma optical emission spectrome- try (Inst.Spektrochem. Angew. Spektrosk. (ISAS) Postfach 10 13 52 D-4600 Dortmund 1 Germany). 9 11C2890. Vereda Alonso E. Garcia de Torres A. Sanchez Rojas F. Can0 Pavh J. M. Determination of nickel by ICP spectrometry involving a prior extraction with 1,5-bis(di-2- pyridyl methylene) thiocarbonohydrazide into methyl iso- butyl ketone and butyl alcohol. A comparative study (Dept. Anal. Chem. Fac. Sci. Univ. Miilaga 29071 Miilaga Spain). 911C2891. Leiterer M. Ettig St. Griin M. Determination of heavy metals in soils and sewage sludges by inductively coupled plasma atomic emission spectrometry-investigations on matrix effects (Inst.Plant Nutr. Ecotoxicol. Jena Naum- burger Stralje 978 Jena 9 Germany). 911C2892. Lathen C. Docalkal B. Broekaert J. A. C. Tschiipel P. Tiilg G. Determination of trace elements in a silicon carbide powder (Inst. Spektrochem. Angew. Spektrosk. (ISAS) Postfach 10 1 3 52 D-4600 Dortmund 1 Germany). 911C2893. Krause P. Meyberg F. Dannecker W. Application of ICP-OES and ICP-MS to the analysis of airborne pariculate matter determination of trace elements and matrix charac- terization (Univ. Hamburg Inst. Anorg. Angew. Chem. Martin-Luther-King-Platz 6 D-2000 Hamburg 13 Ger- many). 911C2894. Krause P. Hamester M. Dannecker W. Analysis of weathered sandstones using laser ablation inductively coup- led plasma mass spectrometry (Univ. Hamburg Inst. Anorg. Angew.Chem. Martin-Luther-King-Platz 6 D-2000 Hamburg 13 Germany). 9 l/C2895. Uitbeijerse E. Klok A. Simultaneous analysis of hydride forming and non-hydride forming elements with ICP (Baird Europe B.V. Produktieweg 30 2382 PC Zoeter- woude The Netherlands). 911C2896. Wiinsch G. Knobloch S. Luck J. Bliidorn W. Enrich- ment procedure for water analysis to fulfil the EPA detection limits with ICP-AES (Univ. Hannover Inst. Anorgan. Chem. Callinstr. 9 D-3000 Hannover Ger- many). 911C2897. Gross R. Platzer B. Leitmer E. Schalk A. Sinabell H. Zach H. Knapp G. Atomic emission gas chromatographic detection chemical and spectral interferences in the stabil- ized capacitive plasma (SCP) (Graz Tech. Univ. Dept. Anal. Chem. Micro- Radiochem. Technikerstr. 4 A-8010 Graz Austria).911C2898. Funtov V. N. Nemets V. M. Soloviov,A. A. Spectroscopic measurements in gas chromatography (Inst. Phys Lenin- grad Univ. Leningrad 198904 USSR). Papers 9 112899-9 112928 were presented at the Winter Conference on Flow Injection Analysis Scottsdale AZ USA 6th-9th January 199 1. 9 11C2899. Tyson J. F. Flow injection techniques for preconcentration and matrix isolation in atomic spectrometry (Dept. Chem. Univ. Massachusetts Amherst MA 0 1003 USA). 911C2900. McIntosh S. Li Z. Slavin W. Hergenreder R. Determi- nation of hydride forming elements in various matrices using flow injection atomic absorption spectrometry (Per- kin-Elmer Norwalk CT 06859-0219 USA). 9 1/C290 1. Peski E. F. Automated analyser for the determination of mercury in geological materials (Bonder-Clegg North Vancouver B.C.Canada). 911C2902A. Lancaster H. L. RiiiiCka J. Christian G. D. Preconcen- tration techniques in FIA using sorbent extraction with atomic spectroscopy (Univ. Washington Dept. Chem. Seattle WA 98 195 USA). 911C2902B. Denoyer E. R. Hergenreder R. Georgitis S. Vollkopf U. Using flow injection analysis with ICP mass spectrome- try (Perkin-Elmer 761 Main Ave. Norwalk CT 06859- 02 19 USA). 911C2903. del Barrio S. Vergara A. Valle F. J. Application of the ICP-AES technique to the simultaneous multi-element geochemical analysis optimization of instrumental para- meters (Inst. Tecnol. Geominero Spain). 911C2904. Fariiias J. C. Barba M. F. Inter-element effects in inductively coupled plasma spectrometry (Inst. Ceriimica Vidrio Arganda del Rey Madrid 28500 Spain).911C2905. Sainchez Uria E. Menendez A. Sanz A. New achieve- ments in the use of on-line separations with an ICP-AES detector for the determination of non-metallic elements (Dpto. Quim. Fis. Anal. Fac. Quim. Oviedo 33006 Spain).JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY AUGUST 199 1 VOL. 6 227R 91/C2906. Sad& M. Lao C. Cotrino J. Spectra acquisition and treatment in a surfatron-MIP (Dpto. Fis. Aplic. Cbrdoba 1407 1 Spain). 91/C2907. Mora J. Hemandis V. Canals A. Thermospray nebulizer preliminary studies for the introduction of organic solutions into an ICP (Dpto. Quim. Anal. Alicante 03071 Spain). 91/C2908. Benavides M. T. Saez M. Cotrino J. Fundamental physical properties of a surfatron-MIP (Dpto. Fis. Aplic. C6rdoba 1407 1 Spain).91/C2909. Basadre M. I. Jouineau M. Study and control of interfer- ences in an ICP (organic solvents introduction). (Dpto. Quim. Anal. Fac. Quim. Univ. Santiago de Compostela Spain). 91/C29 10. Sang R. Latest instrumental developments in ICP emission spectrometry (Chemicontrol S. L. Avda. Pedro Diez 25 Madrid 280 19 Spain). 91/C2911. Barrios V. Canals A. Hemandis V. Design of a high efficiency pneumatic nebulizer for ICP-AES (Dpto. Quim Anal. Univ. Alicante Alicante 0307 1 Spain). 91/C2912. Canto J. Menendez A. Sanchez Uria E. Sanz Medel A. The use of on-line separation techniques for the determina- tion of Sb and Zn electrolysis liquids by ICP (Dpto. Quim. Fis. Anal. Fac. Quim. Oviedo 33006 Spain). 9 1/C29 1 3. Camuiia J. F. Mendndez A. Sanchez Uria E. Sanz Medel A.Liquid-liquid on-line extraction for the determination of ultratraces of A1 using an ICP as the detection system (Dpto. Quim. Fis. Anal. Univ. Oviedo Oviedo 33006 Spain). 91/C2914. Salit M. L. Duffy M. L. Yates D. A. Druszkowski E. Bradley A. F. Advanced internal standard techniques in ICP-AES (Perkin-Elmer Hispania La Mas6 2 Mirasierra Madrid Spain). 9K2915. Fariiias J. C. Barba M. F. Preparation of standard solutions to be used in inductively coupled plasma spectro- metry (Inst. Cerimica Vidrio Arganda del Rey Madrid 22500 Spain). 9 1 /C29 16. Martinez-Lebrusant Ch. Ortega P. Barba M. F. Refrac- tory materials characterization by ICP (Inst. Cerimica Vidrio Arganda del Rey Madrid 28500 Spain). 91/C2917. Rodriguez A. Garcia J. I. Sanz Medel A. Indirect determination of fluoride in waters by liquid chromato- graphy with fluorimetric and ICP detection (Dpto.Quim. Fis. Anal. Univ. Oviedo Oviedo 33006 Spain). 91/C2918. Sbchez M. I. Lux& M. P. Garcia N. Fdas M. Chromophoric element control in raw materials used in the production of white clinker by ICP spectrometry (Inst. CC. Eduardo Torroja (CSIC) C/Serrano Galvache dn. Madrid 8033 Spain). 91/C2919. Fariiias J. C. Barba M. F. Analytical study of advanced 9 1 /C292 9 1 /C292 ceramic materials with Ti-Zr matrix by ICP spectrometry (Inst. Cerdmica Vidrio Arganda del Rey Madrid 28500 Spain). . Quintero M. C. Saez M. Cotrino J. MendzdeG A. Sainchez Uria J. E Sanz Medel A. Determination of iodine and iodides by AES in a microwave plasma (surfa- tron-MIP) (Dpto. Fis. Aplic.Fac. Cienc. Cdrdoba Spain). . Cenera M. L. Navarro A. G6meg J. Montoro R. Determination of As in tinned mussels with dry mineraliza- tion with ICP-AES detection (Inst. Agroquim. Technol. Aliment. Jaime Roig 1 I Valencia 46010 Spain). 91/C2922. Vddes-Hevia C. Fernbdez M. L. Blanco E. Diaz M. E. Sam Medel A. Direct analysis of Co and Cr in commercial glass introducing the sample in the solid phase as a slurry into an ICP (Dpto. Quim Fis. Anal. Univ. Oviedo Oviedo 33006 Spain). 9 1 /C2923. Viillkupf U. Sancho A. Determination of hydride-forming elements by flow injection analysis with ICP-MS detection (Bodenseewerk Perkin-Elmer GmbH Postfach 101 164 D- 7770 Uberlingen Germany). 9 1 /C2924. Viillkopf U. Modern application of ICP-MS (Bonden- seewerk Perkin-Elmer GmbH Postfach 101 164 D-7770 Uberlingen Germany).91/C2925. Gomez A. Dorado M. T. Gutidrrez I. Application of the ablation-ICP technique to the analysis of Fe-V based products (Cent. Nac. Invest. Metal. Avda. Gregorio del Amo Madrid 8 Spain). 91/C2926. Gpez-Molinero A. Anzano J. M. Martinez M. C. Castillo J. R. Determination of erbium in optic fibre forerunners by ICP-AES (Dpto. Quim. Anal. Fac. Cienc. Univ. Zaragoza Zaragoza 50009 Spain). 91/C2927. Pintor R. Villarreal A. Upez-Molinero A. Castillo J. R Multi-elemental determination in geological material by inductively coupled plasma spectrometry (Opto. Quim. Anal. Fac. Cienc. Univ. Zaragoza Zaragoza 50609 Spain). 9 1 /C2928. Garcia N. Sanchez M. I. L u h M. P. Frias M. The use of ICP-AES and UV-visible spectrophotometry to deter- mine Fell and Fell1 in silicate rocks (Inst. C.C. Eduardo Torroja (C.S.I.C.) C/Serrano Galvache s/n Madrid 28033 Spain).