Journal
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Volume 30, Issue 11, Pages 29432-29441Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-022-24023-3
Keywords
Chiral uniconazole; SFC-MS/MS; Earthworm-soil microcosm; Enantioselective bioaccumulation; Enantioselective dissipation
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This study investigated the enantioselective bioaccumulation and dissipation of uniconazole enantiomers in an earthworm-soil microcosm. A fast enantioseparation method was established using supercritical fluid chromatography-tandem mass spectrometry. The results showed that the bioaccumulation of uniconazole enantiomers in earthworms increased with time and reached a maximum on the 7th day, while the dissipation in soil was slow. No enantioselectivity was observed in the earthworm-soil microcosm.
In this work, the enantioselective bioaccumulation and dissipation of uniconazole enantiomers in earthworm-soil microcosm were studied. A fast enantioseparation method of uniconazole through supercritical fluid chromatography-tandem mass spectrometry (SFC-MS/MS) was established. The CHIRALCEL OZ-3 column and a mixture of CO2 and methanol (80:20, v/v) were used within 1.0 min to separate uniconazole enantiomers. The recoveries of uniconazole enantiomers in earthworm and soil samples ranged from 83.3 to 113%, and the intra-day and inter-day relative standard deviation values were lower than 11%. In earthworms, the bioaccumulation concentrations of uniconazole enantiomers increased with time and reached the maximum on the 7th day and then decreased. The elimination of uniconazole enantiomers in earthworms followed the first-order kinetics equation, and the elimination half-lives were approximately 7 days. In artificial soil, the dissipation of uniconazole enantiomers was slow, and the dissipation half-lives were both 25.7 days. No enantioselectivity occurred in the earthworm-soil microcosm. These results may reduce the uncertainty of environmental risk assessment for uniconazole.
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