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Field dissipation and environmental hazard assessment of clomazone, molinate, and thiobencarb in Australian rice culture

Version 2 2024-06-04, 05:02
Version 1 2017-05-16, 15:07
journal contribution
posted on 2024-06-04, 05:02 authored by Wendy QuayleWendy Quayle, DP Oliver, S Zrna
The fates of clomazone [2-(2-chlorophenyl)methyl-4,4-dimethyl-3-isoxazolidinone], molinate (S-ethyl hexahydro-1-H-azepine-1-carbothioate), and thiobencarb {S-[(4-chlorophenyl)methyl]diethylcarbamothioate} applied to rice were studied at two locations in New South Wales (Australia). Rates of dissipation (DT50) from floodwaters and soils were measured. Dissipation of the three herbicides from water and soil can be best explained by a first-order decay process. DT50 values for clomazone, molinate, and thiobencarb were 7.2, 5.1, and 3.5 days, respectively, in water and 14.6, 23.9, and >46 days, respectively, in surface soil. Maximum measured concentrations of clomazone, molinate, and thiobencarb in floodwaters were 202, 1042, and 148 μg/L, respectively, taking 18.4, 26.4, and 21.4 days to dissipate to concentrations set to protect aquatic ecosystems. A hazard assessment identified clomazone as presenting a low environmental hazard while molinate and thiobencarb presented a medium environmental hazard when used at registered field rates.

History

Journal

Journal of agricultural and food chemistry

Volume

54

Pagination

7213-7220

Location

Columbus, Ohio

ISSN

0021-8561

eISSN

1520-5118

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

2006, American Chemical Society

Issue

19

Publisher

American Chemical Society

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