Abstract
Abstract The lampricide, 3-trifluoromethyl-4-nitrophenol (TFM), was added to three lined, sedimented ponds to determine the fate of this chemical and its effect on the benthos of quiescent waters. Two ponds were treated with the commercial formulation and the third was treated with purified TFM. Water column, sediment and benthos samples were taken regularly but not necessarily simultaneously. The initial distribution of TFM in the water column was monitored as was the rate of disappearance of TFM which was calculated to be 0.068 day-1. Appreciable concentrations of TFM were found in the sediment over the two weeks following treatment, with only trace concentrations detected 117 days after treatment. No known decomposition products of TFM were detected in the water or sediment samples. Only the oligochaete and mollusc populations decreased after treatment, but they had returned to levels in the control pond within a year after addition of the chemical.
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