AbstractMathematical simulations of the dissipation of triclopyr butoxyethyl ester in a model aquatic system representing a shallow, static pond were conducted. Aqueous hydrolysis, sorption to bottom sediment, hydrolysis in sediment and photolysis were considered in predicting aqueous concentration‐time profiles. Potential concentrations in Coho salmon were evaluated as part of the model based on rate constants for uptake, hydrolysis and elimination as determined in laboratory investigations conducted in another study. Predicted chemical concentrations in the fish were then related to toxicity data to estimate aqueous concentrations in the model environment required to give a toxic response. In general, the simulations showed that the ester concentration in the pond water would decline, with an approximate half‐life of 6 to 24 h. Initial ester concentrations of 1.0 to 1.5 mg/L in this simulated pond environment would be required to result in chemical concentrations in fish above toxic threshold lev
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