Isolation and partial characterization of forest floor and soil organic sulfur. Fitzgerald, J. W. Biogeochemistry, 1985.
Isolation and partial characterization of forest floor and soil organic sulfur. [pdf]Paper  abstract   bibtex   
The formation of organic sulfur from inorganic sulfate was investigated in hardwood forest floor and mineral horizons. All samples converted sulfate-sulfur into a non-salt extractable form which was recoverable only under conditions which release organic matter. This conversion was inhibited by azide, by erythromycin, candicidin, chloramphenicol and tetracycline. The form of sulfur generated in the O2 forest floor layer and in A1-horizon soil was characterized as having an average C:N:S ratio of 103:6:1. The ester sulfate content of the O2 extract was about 60%. Reduction yielded lower estimates of ester sulfate for two of the three soil extracts analyzed. The electrophoretic heterogeneity of all extracts suggests that some may contain stable ester linkages that hydrolyze only after prolonged treatment and that the standard procedure for hydriodic acid reduction may provide conditions of temperature and contact time with the acid which are insufficient for the release of sulfate from these esters.

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