Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 65, Issue 42, Pages 9200-9207Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jafc.7b03679
Keywords
soil dissipation; herbicide; benzobicyclon; benzobicyclon hydrolysate; rice; pesticide
Funding
- California Rice Research Board [RP-5]
- Donald G. Crosby Endowment in Environmental Chemistry
- William G. Golden Jr. and Kathleen H. Golden International Agriculture Fellowship
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The herbicide benzobicyclon (BZB; 3-(2-chloro-4-(methylsulfonyl)benzoy1)-2-phenylthiobicyclo[3.2.1] oct-2-en-4-one) has recently been approved for use on California rice fields by the United States Environmental Protection Agency (U.S. EPA). Hydrolysis of BZB rapidly forms the active compound, benzobicyclon hydrolysate (BH), whose fate is currently not well understood. A model California rice soil was used to determine BH soil dissipation. The pK(a) and aqueous solubility were also determined, as experimental values are not currently available. Sorption data indicate BH does not bind tightly, or irreversibly, with this soil. Flooding resulted in decreased BH loss, indicating anaerobic microbes are less likely to transform BH compared to aerobic microorganisms. Temperature increased dissipation, while autoclaving decreased BH loss. Overall, dissipation was slow regardless of treatment. Further investigation is needed to elucidate the exact routes of loss in soil, though BH is expected to dissipate slowly in flooded rice field soil.
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