ANALAO 108 (1 285) 425-552 (1 983) April 1983THE ANALYSTTHE ANALYTICAL JOURNAL OF THE ROYAL SOCIETY OF CHEMISTRY42544345245746447047648148549250551 051 5CONTENTSKinetic, Static and Stirring Errors of Liquid Junction Reference Electrodes-Donald P. BrezinskiAnalytical Use of the Kinetics of Complex Formation : Simultaneous Determination of Iron andCobalt by Differential Kinetic Methods-L. Ballesteros and D. PBrez-BenditoImprovements t o the Oxygen Flask Combustion Procedure for Assay of Halogenated OrganicCompounds-Duncan Thorburn Burns and Binod K. MaitinEvaluation of Equivalence Points in the Potentiometric Titration of Mixtures of Halides-DuncanThorburn Burns, Binod K. Maitin and Gyula SvehlaFlow Injection Voltammetric Determination of Nitrate After Reduction t o Nitrite-Arnbld G.Fogg,Antoine Y. Chamsi and Mohamed A. AbdallaFully Automatic Flow Injection System for the Determination o f Uranium at Trace Levels in OreLeachates-Thomas P. Lynch, Arthur F. Taylor and John N. WilsonVolatilisation of Zirconium, Vanadium, Uranium and Chromium Using Electrothermal Carbon CupSample Vaporisation into an Inductively Coupled Plasma-Kin C. Ng and Joseph A. CarusoElectrothermal Atomisation Atomic-absorption Spectrophotometric Determination of Chrom-ium(VI) in Urine by Solvent Extraction Separation w i t h Liquid Anion Exchangers-ClaudiaMinoia, Ambrogio Mazzucotelli, Alessandro Cavalleri and Vincenzo MingantiUse of Laser Raman Spectrometry for a Quantitative Study of the Urea Synthesis under ProcessConditions.A Feasibility Study-Martin van Eck, Johannes P. J. van Dalen and Leo de GalanDistribution of Zinc Amongst Human Serum Proteins Determined by Affinity Chromatography andAtomic-absorption Spectrophotometry-John W. Foote and H. Trevor DelvesSpectrofluorimetric Determination and Thin-layer Chromatographic Identification of Selenium inFoods-Teresa Moreno-Dominguez, Concepcion Garcia-Moreno and Abel MarinB-FontChromatographic Seperation of Chlorinated Hydrocarbons Using Columns of Silica Gel o f VaryingDegrees o f Porosity and Activation-Vittorio Contardi, Renzo Capelli, Gilda Zanicchi and Marco DragoSolid - Liquid Separation after Liquid - Liquid Extraction : Spectrophotometric Determination ofCopper by Extraction of i t s 1 -Phenyl-4,4,6-trimethyl-(l H,4H)-pyrimidine-2-thiol into MoltenNaphthalene-Abdul Wasey, Raj Kurnar Bansal, Bal Krishan Puri and Masatada SatakePart 1.SHORT PAPERS521 Gas Chromatographic - Mass Spectrometric Identification of 9,lO-Epoxystearate in Human Blood-Gunnar A.Ulsaker and Gerd Teien524 Spectrophotometric Determination ofw Small Amounts of Niobium in Steels Using Sulphochloro-phenol S-ZdenBk &iek and Vlasta Studlarova528 Spectrophotometric Determination o f Cobalt after Coprecipitation o f i t s Morpholine-4-carbodi-thioate with Microcrystalline Naphtha!ene-Charnan La1 Sethi, Ashok Kumar, Bal Krishan Puri andMasatada Satake531534537540543546549552Spectrophotometric Determination o f Some Lanthanides as TetraethylenepentamineheptaaceticAcid Chelates-M.Tarek M. Zaki, Abdel F. Shoukry and Mohamed B. HafezSpectrophotometric Determination of Cerium w i t h Methylthymol Blue in the Presence o f Oxalateand Cyanide as Masking Agents-Amalia Cabrera-Martin, Roberto Izquierdo-Hornillos, Albert0 J.Quejido-Cabezas and Jose L. Peral-FernandezPotentiometric Titration Method for the Similtaneous Determination of Two Monofunctional WeakAcids of Similar Strength : Titration t o the Initial Potential-Hilda Szalai and Tames L. PaelRapid Routine Procedure for the Determination of Anhydrous and Hydrated Tripolyphosphate bymeans of X-ray Powder Diffraction-Alessandro MangiaCatalimetric Determination of Iodine in Common Salt-Kambharnpati Sriramam, Brahmandam S. R.Sarma, Agnihotram R.K. Vara Prasad and Konidena KalidasSome Comments on Calibration Procedures-Allan G. C. MorrisBOOK REVIEWSERRATASummaries of Papers in this hue-Pages iii, iv, v, vi, vii, viii, ixPrinted by Heffers Printers Ltd Cambridge EnglandEntered as Second Class at New York, USA, Post OfficNEWSTAINLESS STEELCERTIFIED REFERENCEMATERIALSavailable fromBUREAU OF ANALYSEDSAMPLES LTDFor full details of these, and for copiesof new catalogue of all CRMs suppliedby BAS, write, telephone or telex to:BAS Ltd., Newham Hall, Newby,Middlesbrough, Cleveland, TS8 9EATelephone: Middlesbrough 31 721 6Telex: 587765 BASRIDA202 for further information. See page xCOMPUTERS IN AUTOMATION ANDLABORATORY MANAGEMENTThe 5th Summer School ofAutomatic Chemical AnalysisA residential course at the University of Sussex,Falmer, Brighton, England.10th to 15th July 1983For the past four years this highly acclaimed coursehas been held at the University College of Swansea.The new venue will provide an opportunity to2xpand the scope of the course while retaining theproven format which includes a balanced mixtureof theory, practice and personal tuition.The programme will include lectures, tutorials andpractical sessions on the following broad topics:AutomationComputingData handlingManagementMicro-electronicsDetailed information and registration forms from:The 5th Summer School ofAutomatic Chemical Ana I ysis,176A North View Road,London, N8 7NB.England.A201 for further information.See page xSITUATIONS VACANTAppllcatlons are lnvlted for appolntment to the abovepost wlth effect from 1 February 1984.The University wishes to appoint a sclentlst wlth anestablished research record to take responslblllty forthe further development of research and teachlng Inthis recently created department. Candidates currentlyDccupylng either academic or non-academlc positlonsshould have a wide knowledge of modern Instrumentalmalysls and thls requlrement wlll be of primeimportance In maklng the selectlon for the post.Appointment, dependlng on quallflcatlons and:3xperlence, wlll be made on the salary scalei?23 109-R24 045 x 1 035-R30 255 per annum, todependants at UCT, generous study leave prlvlle es, aqouslng subsldy scheme subject to State regula#ons,pension fund, medlcal ald and group llfe assurance..4ppllcants should submlt a currlculum vitae statlngpresent salary, research Interests and publlcatlons, thedate duty could be assumed and the names andaddresses of three referees whom the Unlverslty mayIon should be obtalned from Mlss Jsltles Office, Chlchester House, 278ondon WClV 7HE, or from the ReglstrarThe Unlverslty's policy Is not torace or religion. FurtherInformation on thedlscrlmlnate on the grounds of sex,lmplernentatlon of thlspollcy Is obtainableFOR SALEX-RAY FLUORESCENCE SYSTEMFOR SALEPhilips PW 1410 X-ray FluorescenceSystem, 10 years old, for sale. Includes inaddition to normal specification a fivecrystal changer, Goniometer, Control Unitand Helium Flush.Apply to the Chief Executive, BritishCeramic Research Association Limited.Telephone No. 0782 45431