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Extra info for Environmental chemistry, Vol. 1. A review of the recent literature concerning the organic chemistry of environments published up to mid-1973

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Gocke, Arch. , 1970, 67, 285. W. S. Gardner and G. F. Lee, Environ. Sci. , 1973, 7, 719. Environmental Organic Chemistry of Rivers and Lakes 27 Evidence concerning the effect of bacteria on the amino-acid composition was obtained by Gocke12from a comparison of a bacteria-free algal culture with a similar culture contaminated with bacteria. The amino-acid pattern differed qualitatively and quantitatively. In the pure culture aspartic acid (9; R = HO,CCH,) and glutamic acid (9; R = H02CCH,CH2) were dominant , whereas the contaminated culture was dominated by serine and glycine, as in the lakes examined.

In a review of compounds identified in natural waters, sediments, sewage, and soils, Vallentyne, stated that there had been little investigation into the detailed composition of particulate matter, which constitutes less than 10% of the organic carbon in normal lakes and rivers but up to 60 % in turbid rivers, corresponding to concentrations of particulate carbon up to 10 mg I-l. The only compounds identified were carbohydrates obtained by hydrolysis of cellular material. More recent studies concerned with the release of dissolved organic material by bacterial attack on algae have reported the yield of the residual refractory material as a measure of the amount of carbon being added to the sediments.

Hooper in ‘Advances in Organic Geochemistry 1971’, ed. H. R. von Gaertner and H. Wehner, Pergamon Press, Oxford, 1972, pp. 277-291. A. Nissenbaum, M. J. Baedecker, and I. R. Kaplan, Geochim. Cosrnochim. Acfa, 1972, 36,709. 45The other isomer has also been detected in an oligotrophic sediment. ’ Aromatic hydrocarbons were detected but not identified in earlier studies. They have been found in rural soils and are not thought to be entirely derived from atmospheric f a l l - o ~ t . 34 Other components of the branched/cyclic fraction for which a microbial origin has been suggested50 include 10-methyl branched C , , and CIS acids and the cyclopropanoid acids dihydrosterculic (23a) and lactobacillic (23b).

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