John Wiley & Sons, Ltd.

Amelioration of acidic soil increases the toxicity of the weak base carbendazim to the earthworm Eisenia fetida

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Amelioration of acidic soils is a common practice and may affect the bioavailability of an ionizable organic pollutant to organisms. The toxicity of the weak base carbendazim to the earthworm (Eisenia fetida) was studied in an acidic soil (pH‐H2O, 4.6) and in the ameliorated soil (pH‐H2O, 7.5). The results indicated that the median lethal concentration (LC50) of carbendazim for E. fetida decreased from 21.8 mg/kg in acidic soil to 7.35mg/kg in the ameliorated soil. To understand why carbendazim toxicity to the earthworm was increased by the amelioration, we measured the carbendazim concentrations in the soil pore water and found increased carbendazim concentrations in the pore water, resulting in increased toxicity of carbendazim to earthworms. The increased pore concentrations result from decreased adsorption because of the effects of pH and calcium ions. Environ Toxicol Chem © 2013 SETAC

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