The results of a study into the persistence of triphenyltin (=fentin) acetate in soil are presented. The fungicide is degraded biologically 50% being decomposed in 140 days. The photochemical degradation of fentin acetate into inorganic tin via diphenyltin and monophenyltin compounds also is demonstrated. The leaching of fentin acetate in soil and its effect on soil nitrification is discussed.

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A range of Chromosorbs and Tenax-GC have been compared with regard to their efficiency as adsorbents for volatile odorous compounds using a very simple model system. When desorption was accomplished by solvent elution using acetone, Chromosorb 103 provided the best recoveries of those investigated (between 90 and 95%). I n situations where thermal lability of trapped compounds is not a problem, use of Tenax-GC and thermal desorption a t about 250 "C would be recommended on the basis of this survey, during which this approach consistently provided recoveries greater than 96% from small sample volumes. The latter procedure was applied to the analysis of an industrial malodour from an animal rendering factory, and using gas chromatographymass spectrometry over 35 compounds (92% of the total odour sample) were positively identified. I n particular, a range of alkylthiophenes may be characteristic of this particular odour.

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