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The applicability of the silver sulfate-acid dichromate oxidation (chemical oxygen demand) method for determining the carbon-bound electron compositions of microbial cells, substrates, and metabolic by-products was evaluated. An approach for approximating the carbon-bound electron composition of microbial cells from CHN data is also presented. Ten aliphatic and aromatic carboxylic acids, 17 amino acids, and 8 sugars generally gave 96 to 101% (mainly -98%) recovery with 0.0625 N dichromatedoi:10.1128/aem.37.2.237-243.1979 fatcat:yagmw74pcfhi7e6d4ckxfwy3ru