Abstract
SUMMARYCladophora glomeratawas exposed to CH3203HgCl at concentrations of 10, 50, and 100 μg/liter of water. Formalin‐killed alga was exposed to a concentration of 50 μg CH3203HgCl/liter. Uptake was monitored at 2 and 12 hr, and days 1, 2, 4, 8, and 16. At the end of this period, theCladophorawas placed in uncontaminated water, and release of methylmercury was monitored at 1, 2, 4, 8, and 16 days. Sorption occurred at all concentrations, and the live algal material accumulated more methylmercury than the dead alga, at equal exposure concentrations. Accumulation of methylmercury by the liveCladophorapeaked on or near the second day for all exposure concentrations, suggesting that the uptake rate was independent of methylmercury concentration in the water. Uptake was greatest at the 50 μg/liter exposure. Desorption was nominal during the 16‐day release period. The mechanisms of methylmercury uptake byCladophoraare discussed.
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