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The disappearance of stable-isotope-labeled formate in freshwater sediment from Lake Vechten was studied by gas chromatography-mass spectrometry. Both deuterium- and (sup13)C-labeled formate were removed from pore water at a high rate (400 (plusmn) 35 [standard deviation] and 1,700 (plusmn) 600 (mu)M h(sup-1), respectively), with concomitant formation of nonlabeled formate. The removal rate of labeled and nonlabeled formate amounted to 240 (plusmn) 15 and 400 (plusmn) 40 (mu)M h(sup-1), respectively. The formation of nonlabeled formate is explained by isotopic exchange due to the activity of formate dehydrogenase rather than by the turnover of formate.

Evidence for Isotopic Exchange during Metabolism of Stable-Isotope-Labeled Formate in a Methanogenic Sediment