February, 1979 SUMMARIES OF PAPERS I N THIS ISSUESpectrophotometric Determination of Dequalinium Chloride inPharmaceutical PreparationsShort PaperKeywords : Dequalinium chloride determination ; spectrophotometry ; picricacidC. P. LEUNG and S. Y. KWANGovernment Laboratory, Oil Street, North Point, Hong Kong.Analyst, 1979, 104, 143-146.VSpectrophotometric Determination of Isoprenaline Sulphate andMethyldopa Using ChloranilShort PaperKeywords : Isoprenaline sulphate determination ; methyldopa deterinination ;chloranil reagent ; spectrophotometry ; charge-transfer complexMOHAMED A. KORANY and ABDEL-A212 M. WAHBIFaculty of Pharmacy, University of Alexandria, Alexandria, Egypt.Analyst, 1979, 104, 146-148.Spectrophotometric Determination of Microgram Amounts ofHydroquinone, Pyrogallol and ResorcinolShort PaperKeywords : Hydroquinone determination ; pyrogallol determination ; resorcinoldetermination ; spectropJzotometvic microdetermination ; sodium carbonateQ.S. USMANI, M. M. BEG and I. C. SHUKLADepartment of Chemistry, TJniversity of Allahabad, Allahabad, India.Analyst, 1979, 104, 148-151.Simple Procedure for the Determination of Total Carbon and itsRadioactivity in Soils and Plant MaterialsShort PapevKeywords ; Soil organic carbon determination ; plant carbon determination ;I4C radioactivity nzeasuvement ; chromic acid digestionR. C. DALALUniversity of New England, Armidale, N.S.W. 2351, Australia.Analyst, 1979, 104, 151-154.Determination of Lead in Columbite Concentrates byAtomic- absorption Spectrometry After Sulphide SeparationSJzort PaperKeywords : Lead determination ; columbite concentrates ; atomic-absorptionspectrometry ; sulphide separationC.CHOWGeological Survey Laboratory, P.O. Box 1015, Ipoh, West Malaysia.Analyst, 1979, 104, 154-156vi SUMMARIES OF PAPERS I N THIS ISSUEDirect Determination of Calcium, Magnesium and Zinc inLubricating Oils and Additives by Atomic-absorptionSpectrometry Using ii Mixed Solvent SystemShort PaperFcbvuary, 1979Keywords : Lubricating oil analysis ; calcium determination ; magnesiumdeterwination ; zinc determination ; atomic-absovption spectvometvyZSUZSA WITTMANNHungarian Oil and Gas Research Institute, VeszprCm, Hungary.Analyst, 1979, 104, 156-160.Spectrophotometric Determination of Iron by Synergistic Extractionwith Isonitrosobenzoylacetone and PyridineShort PaperKeywords : Synergistic ivon extvactiosa ; iron determination ; spectrophotometry ;alloy analysis ; asonitrosobenzo3,lacetoneB. J.DESAI and V. M. SHINDEDepartment of Chemistry, Shivaj i Univcrsity, Kolhapur 41 6 004, India.Analyst, 1979, 104, 160-163.Potentiometric Method for the Rapid Determination of Sulphatein the Presence of Chromium(V1)Short PaperKeywords : Sulphate determinatzon ; barium ion-selective electrode ;chromium( V I ) ; potentiowefryR. PRASADlnco Europe Limited, European Research and Development Centre, Wiggin Street,Birmingham, B 16 OA J.Analyst, 1979, 104, 164-167.Determination of Thiocyanates by Thermal Decomposition ofSilver ThiocyanateSJzort PapevKeywords : Thiocyanate determinaticn ; tliermal decomposition of silver thio-cyanate ; halide and thiocyanate determinationA. CYGANSKI and T. MAJEWSKIInstitute of General Chemistry, Technical University, ul. Zwirki 36, 90-924 L6di,Poland.Analyst, 1979, 104, 167-171.Selective Determination of Arsenic( 111) and Arsenic(V) byAtomic- absorption Spectrophotometry Following Arsine GenerationCommu nicationKeywovds: Arsenic (111) and arsenic ( V ) selective determination; atomic-absorption spectvophotometry ; hydvide generationSUSUMU NAKASHIMAInstitute for Agricultural and Biological Sciences, Okayama University,Kurashiki-shi, Okayama 710, Japan.Analyst, 1979, 104, 172-173