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Dissipation of Herbicide Methiozolin and Its Metabolites in Aerobic Sediment–Water Systems

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Abstract

Methiozolin is a novel herbicide for controlling annual bluegrass. After applying 14C labelled methiozolin in two sediment (clay loam and sand)-water systems under aerobic conditions, its distribution, half-life, and metabolites within 300 days were investigated. The mass balance ranged within 92.0%–104.4% of applied radioactivity (AR). Radioactivity in the water declined sharply from 94.4% to 0.5% AR, while in the sediment it increased to 83.9% AR at 14 days before declining to 9.1% AR. The volatiles were minimal (< 0.5% AR), and the evolved labelled CO2 accounted for up to ~ 33.4% AR. From Radio-HPLC analysis, labelled methiozolin in water decreased from 108.9% to 0% AR, while a maximum of 15.1% AR remained in the sediment at the end. Eight metabolites were detected, all at minor levels and accounting for < 5.5% AR. The half-life of labelled methiozolin in the total sediment–water systems were 50.7 and 38.7 days for clay loam and sand, respectively.

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Acknowledgements

The authors wish to thank the Moghu Research Center for providing reference standards.

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Correspondence to Jeong-Han Kim.

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Kim, JH., Seo, JS., An, JY. et al. Dissipation of Herbicide Methiozolin and Its Metabolites in Aerobic Sediment–Water Systems. Bull Environ Contam Toxicol 105, 656–664 (2020). https://doi.org/10.1007/s00128-020-02976-w

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  • DOI: https://doi.org/10.1007/s00128-020-02976-w

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