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A rapid and sensitive method for the determination of mercury in urine is described. It is based upon wet digestion of 1-ml samples of urine by potassium permanganatesulphuric acid a t room temperature overnight, reduction of mercury(I1) to metallic mercury by tin(II), evaporation of mercury vapour from the solution by an air current a t room temperature and determination of mercury by cold-vapour atomic-absorption measurement a t 253.7nm. Mercury determination on digested samples can be carried out a t the speed of about 1 sample minute-l. The amounts of chemicals and of glassware needed are much less than those required for the dithizone method. Detection limit is 2 ng of mercury in 1 ml of urine. The proposed method has been compared with dithizone analysis in a series of urine samples with fairly good results.Chemical interference from various substances is discussed. 21, 475.

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aromatic hydrocarbons in the occupational environment: A review with special reference to benzo[a]pyrene measurements in Swedish industry. Scand j work environ health 8 (1982) 1-19. A review is given of measurements of polycyclic aromatic hydrocarbons (PAH) in the work environment in general with emphasis upon Swedish measurements of benzo[a]pyrene not previously published in international literature. Finally, epidemiologic investigations on PAHexposed workers, as well as threshold limit values for PAH, are discussed.

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