John Wiley & Sons, Ltd.

Degradation rate of sodium fluoroacetate in three New Zealand soils

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The degradation rate of sodium fluoroacetate (SFA) was assessed in a laboratory microcosm study incorporating three NZ soil types under different temperature (5, 10 or 20 °C) and soil moisture (35% or 60% water holding capacity) conditions using OECD Guideline 307. A combination of non‐labelled and radio‐labelled 14C‐SFA was added to soil microcosms, with sampling and analysis protocols for soil, soil extracts and evolved CO2 established using liquid scintillation counting and liquid chromatography – mass spectrometry. Degradation products of SFA and their rates of formation were similar in the three soil types. The major degradation pathway for SFA was through microbial degradation to the hydroxyl metabolite, hydroxyacetic acid, and microbial mineralization to CO2 which constituted the major transformation product. Temperature, rather than soil type or moisture content, was the dominant factor affecting the rate of degradation. Soil treatments incubated at 20 °C displayed a more rapid loss of 14C‐SFA residues than lower‐temperature treatments. The transformation half‐life (DT50) of SFA in the three soils increased with decreasing temperature, varying from 6 to 8 d at 20 °C, 10 to 21 d at 10 °C and 22 to 43 d at 5 °C. Environ Toxicol Chem © 2014 SETAC

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