April, 1983 SUMMARIES OF PAPERS IN THIS ISSUESolid - Liquid Separation after Liquid - Liquid Extraction:Spectrophotometric Determination of Copper by Extraction of its1- Phenyl-4,4,6- trimethyl- (lH,4H)-pyrimidine-2- thiol intoMolten NaphthaleneviiA selective spectrophotometric method has been developed for the determina-tion of copper after extraction of its l-pheny1-4,4,6-trimethyl-( 1H,4H)-pyrimidine-2-thiol (PTPT) complex into molten naphthalene. The optimumpH range for the extraction is 7.4-11.7. The solid naphthalene containingthe copper - PTPT complex is separated by filtration and dissolved in chloro-form. The absorbance is measured a t 400 nm against a reagent blank. Beer’slaw is obeyed in the concentration range 5.0-60.7 p g of copper in 10 ml ofchloroform solution.The molar absorptivity and sensitivity are 1.23 x lo41 mol-l cm-l and 0.008 11 p.g cm-2, respectively. The interference of variousions has been studied in detail. Conditions have been established for thedetermination of copper in goat liver, human hair and certain alloys.Keywords : Solid - liquid separation ; spectrophotometry ; copper determina-tion ; biological materials analysis ; alloy analysisABDUL WASEY, RAJ KUMAR BANSAL and BAL KRISHAN PURIDepartment of Chemistry, Indian Institute of Technology, New Delhi 110016, India.and MASATADA SATAKEFaculty of Engineering, Fukui University, Fukui 910, Japan.Analyst, 1983, 108, 515-520.Gas Chromatographic - Mass Spectrometric Identification of9,lO-Epoxystearate in Human BloodShort PaperKeywords : Gas chromatography - mass spectrometry ; 9,lO-epoxystearate ; endo-genous component ; bloodGUNNAR A.ULSAKER and GERD TEIENNational Centre for Medicinal Products Control, Sven Oftedals vei 6, Oslo 9, Norway.Analyst, 1983, 108, 521-524.Spectrophotometric Determination of Small Amounts ofNiobium in Steels Using Sulphochlorophenol SShort PaperKeywords ; Niobium determination ; steel analysis ; matrix extraction ; sulpho-chlorophenol S ; spectrophotometryZDENEK CiZEK and VLASTA STUDLAROVACentral Research Institute, Skoda Co., 316 00 Plzeii, Czechoslovakia.Analyst, 1983, 108, 524-528viii SUMMARIES OF PAPERS I N THIS ISSUESpectrophotometric Determination of Cobalt after Coprecipitationof its Morpholine-4-carbodithioate with MicrocrystallineNaphthaleneApril, 1983Short PaperKeywords : Spectrophotometry ; cobalt determination ; morpholine-Ccarbo-dithioate ; GoprecipitationCHAMAN LAL SETHI, ASHOK KUMAR and BAL KRISHAN PURIDepartment of Chemistry, Indian Institute of Technology, New Delhi 110016, India.and MASATADA SATAKEFaculty of Engineering, Fukui University, Fukui, 910, Japan.Annlyst, 1983, 108, 528-530.Spectrophotometric Determination of Some Lanthanides asTetraethylenepentamineheptaacetic Acid ChelatesShort PaperKeywords : Lanthanide determination ; spectroph.otometry ; tetraetlzylene-pentamineheptaacetic acidM.TARAK M. ZAKI, ADEL F. SHOUKRY and MOHAMED B. HAFEZChemistry Department, Faculty of Sciences, United Arab-Emirates University, P.O.Box 15551, Al-Ain, Abu-Dhabi, United Arab Emirates.Analyst, 1983, 108, 531-534.Spectrophotometric Determination of Cerium with MethylthymolBlue in the Presence of Oxalate and Cyanide as Masking AgentsShort PaperKeywords : Cerium determination ; Metlzylthymol Blue ; spectrophotometry ;Pjj'ect of masking agentsAMALIA CABRERA- MARTIN, ROBERTO IZQUIERDO - HORNILLOS,ALBERT0 J.QUEJIDO-CABEZAS and JOSg L. PERAL-FERNANDEZDepartment of Analytical Chemistry, Facultad de Ciencias Quimicas, UniversidadComplutense de Madrid, Ciudad Universitaria, Madrid-3, Spain.Analyst, 1983, 108, 534-537April, 1983 SUMMARIES OF PAPERS IN THIS ISSUEPotentiometric Titration Method for the SimultaneousDetermination of Two Monofunctional Weak Acids of SimilarStrength: Titration to the Initial PotentialShort PaperKeywords : A cid-mixture determination ; potentiometric titration ; titration toinitial potentialHILDA SZALAI and TAMAS L.PAALNational Institute of Pharmacy, POB 450, Budapest 5, H-1372 Hungary.Analyst, 1583, 108, 537-540.Rapid Routine Procedure for the Determination of Anhydrous andHydrated Tripolyphosphate by means of X-ray Powder DiffractionShort PaperKeywords : Tripolyphosphates determination ; X-ray powder difjcactionALESSANDRO MANGIAIstituto di Chimica Generale ed Inorganica, Universiti di Parma, Via M. D’Azeglio 85,43100 Parma, Italy.Analyst, 1983, 108, 540-543.Catalimetric Determination of Iodine in Common SaltShort PaperKeywords : Iodine determi.nation ; common salt analysis ; catalysis ; hexa-chloroantimonate( V ) hydrolysisKAMBHAMPATI SRIRAMAM, BRAHMANDAM S . R.SARMA, AGNI-HOTRAM R. K. VARA PRASAD and KONIDENA KALIDASDepartment of Chemistry, Nagarjuna University, Nagarjunanagar 522 510 (A.P.),India.Analyst, 1983, 108, 543-546.Some Comments on Calibration Proced.uresShort PaperKeywords : Calibration pvocedures ; X-ray fluorescence spectrometryALLAN G. C. MORRISESAB Ltd., Beechings Way, Gillingham, Kent, ME8 6PU.ixAnalyst, 1983, 108, 546-548TUCK IN UNDER FLAP ATHE ANALYST April, 1983 iREADER ENQUIRY SERVICEFor further information about any of the products featured in the advertise- fments in this issue, please write the appropriate A number in one of the 7 iPostage paid if posted in the British Isles but overseas readers must affix 6 ia stamp.boxes below. :;I H I I(Please use BLOCK CAPITALS)NAM E ..................................................... .........................................................................................................OCCUPATION ................................................................................................................................................................. iADDRESS ............................................................................................................................................................................. iSECOND FOLDPostagewill bePaid byLicenseeDo not affix Postage Stamps if posted inGt. 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