Abstract
The temperature and dissolved oxygen concentration in a thermally stratified lake were measured monthly for ten months. Water samples from different depths were pressure-filtered through 0.22-μm pore-diameter filters. The filtrate and filter-trapped suspended matter were analyzed for Mo and Fe. Higher-filtrate Mo concentrations in anoxic water were not caused by dissolution of suspended Fe 2O 3 particles. Low-filtrate Mo concentrations in deep anoxic water during the summer were accompanied by low-filtrate Fe concentrations and accumulation of H 2S, suggesting that the elements coprecipitate as sulfides. Although filtrate Mo and Fe concentrations in anoxic water correlated very strongly, a fraction of the Mo appeared to resist sulfide precipitation.
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