Abstract
The analysis of sulfur-containing and sulfur-free compounds of known stoichiometry are discussed, and an explanation to account for the observation that the presence of sulfur can cause low yields of hydrogen and large errors in isotopic ratios determined for samples analyzed by the Stump and Frazer methods unless special precautions are exercised are presented. Samples analyzed were glucose, the amino acids, phenylalanine and methionine, and thiourea. Yields of N/sub 2/ and CO/sub 2/ for the samples were close to the theoretical values in all cases. The hydrogen yields for the sulfur-containing samples analyzed were significantly lower than the expected values. A modification of the standard procedure to increase the hydrogen yields is described, and the results presented in the study demonstrate the importance of analyzing control samples of known stoichiometry whose chemistry closely approximates the unknown sample.
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