Anaerobic Oxalate Degradation: Widespread Natural Occurrence in Aquatic Sediments

摘要: Significant concentrations of oxalate (dissolved plus particulate) were present in sediments taken from a diversity aquatic environments, ranging 0.1 to 0.7 mmol/liter sediment. These included pelagic and littoral two freshwater lakes (Searsville Lake, Calif., Lake Tahoe, Calif.), hypersaline, meromictic, alkaline lake (Big Soda Nev.), South San Francisco Bay mud flat salt marsh. The concentration several plant species which are potential detrital inputs these ranged 5.0% (wt/wt). In experiments with litter bags, the content Myriophyllum sp. samples buried decreased 7% original value 175 days. This suggests that detritus is source within sediments. [14C]oxalic acid was anaerobically degraded 14CO2 all sediment types tested, higher rates evident than studied. turnover time added [14C]oxalate less 1 day Searsville total did not vary significantly between therefore appear be controlling rate degradation. However, depth profiles mineralization dissolved closely correlated sediments; both greatest surface (0 5 cm) depth. (9.1 μmol/liter sediment) only 3% extractable (277 at surface. results suggest anaerobic degradation widespread phenomenon may limited by