termine the amount of ester polymer additives in distillate fue:.oils. A large number of ahtracts pertain to the determination of lead in gasolines. Five of the references 5ted make use of the chelatometric tit:-ation. Cipriano (2fC) extracts t’he lee,d as directed in ASTM D 526, then titrates with ethylenediaminetetraacetic acid (EDTA) using Eriochrome black T indicator. Escolar and Castro (27C) treat the sample with a soluticn of chlorine in carbon tetrachloride, cxt,ract lead with water, then tit,rate (:helatometrically. Koyama, Taguchi, ar.d Eguchi (69C) have devised a procedure in which T E L is decomposed with a sclution of bromine in carbon tetrachloride, the lead extracted with nitric acid, and titrated with EDTA. Riquelnie (88C) extracts the lead frcm the gasoline by refluxing with concentrated h;rdrochloric acid, adds nitrilotriacetic acid t,o chelate the lead, and titrates the excess acid with sodium hydroxide. Zlall (119C) employs electrolysis in twcl stages to remove the lead from the gasoline, then determines the lead content by one of three procedures: by weighing the anode; by stripping the anode rind titrating with EDTA; or by strippirg the anode and determining lead photometrically wit.h diphenylcarbazone. A cooperative testc ing program was carried out by laboratories in six member countries of IS0 on ASThl D 526-61, the Gost 63-52 modified by the Russians, and Gost 63-52 further modified by the Americans. The results are discussed by Siniramed and Renzanigo (fOOC‘). Farkas and Fodor (28C) determine TEL in gasoline by means of absorption of tritium bremsst’rahlung. Dagnall and West (24C) have examined the effects of extraneous ions, solvents, and flame height on the determination of lead by atomic absorption spectroscopy. Three sources have used x-ray fluorescence spectroscopy for t’he determination of lead. Szeiman (1OSC) determines small amounts of lead in 3 to 4 minutes. Guiin (38C) uses an iron rod as an internai intensity reference to compensate fcsr the effects of differences in absorpticln between samples. Ilasegawa, Kaji:
