X SUMMARIES OF PAPERS IN THIS ISSUERapid Method for Determining Fluoride in Vegetation Using anIon-selective ElectrodeFluoride was extracted from dried vegetation by stirring with 0.1 N perchloricacid for 20 min at 20 "C. The flu0rid.e content was determined in this extract(pH 1) using the method of standard additions, thus eliminating the need tode-complex fluoride prior to analysis. The presence of up to 2.0% of silicon,0.06y0 of iron, 0.1% of aluminium, 0.7% of magnesium and 1.2% of calciumdid not result in any interferences and recoveries of 98-102y0 were obtained.The fluoride contents of standard saymples determined by this method werehighly correlated (Y = 0.999) with those obtained by reference methods overthe range 4-2000 p g g-l of fluoride in the dry matter.Keywords : Fluoride determination ; fluoride ion-selective electrode ; jluorideJune, 1979in vegetation ; perchloric acid extractionALBERT0 ENRIQUE VILLAEnvironmental Research Department, ALUAR Aluminio Argentino SAIC, 9120Puerto Madryn, Chubut, Argentina.Analyst, 1979, 104, 545-551.Automated Catalytic Method for the Routine Determinationof Molybdenum in Plant MaterialMolybdenum is determined by its catalytic effect on the liberation of iodinefrom iodide by hydrogen peroxide.'The detection limit (twice the standarddeviation of the blank) is 0.01 p.p.m. in plant material, using a 0.25-g sample.Interference from iron is eliminated by preventing any reduction to iron(I1)before complexation with fluoride. High concentrations of salts, othermetals and phosphate do not interfere, and agreement with establishedroutine methods is very good.Keywords Molybdenum determination ; plant material analysis ; automatedcatalytic analysisB.F. QUIN and P. H. WOODSWinchmore Irrigation Research Station, Ministry of Agriculture and Fisheries,Private Bag, Ashburton, New Zealand.Analyst, 1979, 104, 552-559.Determination of the Prostaglandin F2, Content of PharmaceuticalPreparations with Triangle Programmed BromimetricTitration in Flowing SolutionsA survey of the different methods for prostaglandin analysis is given. Theuse of bromine as a reagent for the accurate determination of prostaglandinFz, is indicated from its chemical structure. Several reasons, however, hinderthe use of classical bromimetry.In this paper the application of a new analytical method, the so-calledtriangle programmed titration technique, is described for prostaglandinanalysis. This method permits the simple and effective use of bromine as areagent by performing the titration in a continuous-flow system.The reagentis generated coulometrically during the titration.Methods are described for the determination of the prostaglandin F,,content of different pharmaceutical preparations.Keywords : Prostaglandin F2, determination ; coulometry ; biamperometvy ;triangle programmed bromimetric titration ; flowthrough analysis2s. FEHER, G. NAGY, K. TOTH and E. PUNGORInstitute for General and Analytical Chemistry, Technical University, Budapest,Hungary.and A.TOTHChinoin Pharmaceutical and Chemical Works, Budapest, Hungary.Analyst, 1979, 104, 560-565xii SUMMARIES OF PAPERS I N THIS ISSUEDetermination of Phenindione Using Organic Brominating AgentsJune, 1979Short PaperKeywords : Phenindione determination ; bromination ; titrimetryA. ABOU OUF, M. I. WALASH, M. KIZK and F. BELALFaculty of Pharmacy, Mansoura University, Mansoura, Egypt.Analyst, 1979, 104, 566-568.Application of Difference Spectrophotometry to the Determinationof DipyroneShov,t PaperKeywords : Dipyrone determination ; difference spectrophotometryM. ABDEL-HADY ELSAYED, H. ABDINE and M. E. ABDEL-HAMIDDepartment of Pharmaceutical Analytical Chemistry, Faculty of Pharmacy, Uni-versity of Alexandria, Alexandria, Egypt.Analyst, 1979, 104, 568-572.Spectrophotometric Determination of Cobalt(I1) with2,2'- Pyridil Bis(2 quinolylhydrazone)Short PaperKeywords 2,2'-Pyridil bis-2(quinoi~lhydrazone) reagent; cobalt determina-tion ; alloy analysis ; spectrophotometryH. KULSHRESHTHA, R.B. SINGH and R. P. SINGHDepartment of Chemistry, University of Delhi, Delhi-110007, India.Analyst, 1979, 104, 572-575.Determination of Osmium(VII1) Alone or in Binary Mixtures withSome Group VIII Cations by Pstentiometric Titration of IodideShort PaperKeywords : Osmium( V I I I ) determination ; Potentiometric titration ; silverelectrodeH. KHALIFA, N. T. ABDEL GHANI and M. S. RIZKFaculty of Science, Cairo University, Giza, Cairo, Egypt.Analyst, 1979, 104, 576-579.Gas Chromatographic - Mass Spectrometric Analysis ofPolyethylene Bottle Packed Intravenous Solutions Contaminatedwith N-Ethylaniline from the Rubber Part of the Two-componentClosureCommunicationKeywords ; N-Ethylaniline migration ; rubber disc ; polyethylene plastics ;intravenous solutions ; gas chromatography - mass spectrometryG. A. ULSAKER and G. TEIENNational Centre for Medicinal Products Control, Sven Oftedalsvei 8, Oslo 9, Norway.Analyst, 1979, 104, 580-582xiv SUMMARIES OF PAPERS I N THIS ISSUELuminescence Characteristics of Tubocurarine ChlorideCommunicationKeywovds : Tubocurarine chlovide ; l:wnzinescence characteristicsERNEST B. GIBSON and JAMES €1. TURNBULLJune, 197