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Hydrolysis and Photolysis of Diacylhydrazines-Type Insect Growth Regulator JS-118 in Aqueous Solutions under Abiotic Conditions

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Abstract

JS-118 is a diacylhydrazines-type insect growth regulator which is now used extensively in China. The hydrolysis and photolysis of the pesticide JS-118 in aqueous solutions have been assessed under natural and controlled conditions in this project. Hydrolysis experimental results show that JS-118 is quite stable in aqueous solutions in dark, with no significant variations be observed in degradation under various conditions. Abiotic hydrolysis is relatively unimportant compared to photolysis. The rate of photodecomposition of JS-118 in aqueous solutions follows first-order kinetics both in UV radiation and natural sunlight. The degradation rates are faster under UV light than sunlight, with the half-lives (t 1/2 = ln2/k) of 6.00–10.85 min and 6.63–10.16 day, respectively. Under UV light, two major photoproducts are detected, and tentatively identified according to HPLC-MS spectral information as N-t-butyl-N-(3,5-dimethylbenzoyl) and 3,7-dimethyl-benzoatedihydrofuran. The corresponding photolysis pathways of JS-118 are also proposed. The results obtained indicate that direct photoreaction is an important dissipation pathway of JS-118 in natural water systems.

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Acknowledgment

This work was supported by the financial support of National Natural Science Foundation of China (No. 20777078).

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Authors and Affiliations

  1. School of Applied Science, University of Science and Technology Beijing, 100083, Beijing, China

    J.-Y. Hu, C. Liu, Y.-C. Zhang & Z.-X. Zheng

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  1. J.-Y. Hu
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  2. C. Liu
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  3. Y.-C. Zhang
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  4. Z.-X. Zheng
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Correspondence to J.-Y. Hu.

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Hu, JY., Liu, C., Zhang, YC. et al. Hydrolysis and Photolysis of Diacylhydrazines-Type Insect Growth Regulator JS-118 in Aqueous Solutions under Abiotic Conditions. Bull Environ Contam Toxicol 82, 610–615 (2009). https://doi.org/10.1007/s00128-009-9654-3

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  • DOI: https://doi.org/10.1007/s00128-009-9654-3

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