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| Adsorption of a new insecticide triflumezopyrim on soils |
| Received:March 18, 2019 |
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| KeyWord:Triflumezopyrim;adsorption;free energy;soil |
| Author Name | Affiliation | E-mail | | PENG Jia-hui | College of Chemical and Biological Engineering, Changsha University of Science and Technology, Changsha 410114, China
National Engineering Research Center for Agrochemicals, Hunan Research Institute of Chemical Industry, Changsha 410014, China
Hunan J & F Testing Co. Ltd, Changsha 410014, China | | | OU Xiao-ming | National Engineering Research Center for Agrochemicals, Hunan Research Institute of Chemical Industry, Changsha 410014, China
Hunan J & F Testing Co. Ltd, Changsha 410014, China | | | OU Jiang | National Engineering Research Center for Agrochemicals, Hunan Research Institute of Chemical Industry, Changsha 410014, China
Hunan J & F Testing Co. Ltd, Changsha 410014, China | | | YANG Zhi-fu | National Engineering Research Center for Agrochemicals, Hunan Research Institute of Chemical Industry, Changsha 410014, China
Hunan J & F Testing Co. Ltd, Changsha 410014, China | | | WU Dao-xin | College of Chemical and Biological Engineering, Changsha University of Science and Technology, Changsha 410114, China | daoxinwu@126.com |
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| Abstract: |
| Triflumezopyrim is a novel class of mesoionic insecticides discovered by DuPont Crop Protection, and registered for use on rice, vegetables, and fruits for control of insect pests. In order to provide a reference for setting of reasonable application guidelines and ecological risk assessment of the insecticide, adsorption of triflumezopyrim on three soils, the laterite from Hunan Province, fluvo-aquic soil from Beijing, and terra preta from Jilin Province was studied in the laboratory using high performance liquid chromatography(HPLC)with diode array detector(DAD)according to batch equilibrium method. The experimental results showed that there was a weak sorption of triflumezopyrim on soils. The adsorption isotherms of triflumezopyrim on soils can be described very well by Freudlich equation, and the adsorption coefficient(KF)of triflumezopyrim on the laterite, fluvo-aquic soil, and terra preta was 1.24, 2.02, and 6.63, respectively, and the adsorption free energy(ΔG)was 0.093, 1.642, and 4.438, respectively, indicating that the adsorption largely resulted from the physical adsorption, according to the pesticide environmental test guidelines of China. The adsorption coefficient KF value of triflumezopyrim was influenced by physicochemical properties of soils, and the chemical structure and water solubility of the insecticide itself. Most significant correlation was observed between the KF value of triflumezopyrim and the organic matter and clay content of soils; slight correlation between the KF value of triflumezopyrim and the sand content of soils, and very poor correlation between the KF value of triflumezopyrim and pH value and silt content of soils, suggesting that the organic matter and clay content of soils are important factors affecting the adsorption of triflumezopyrim in water-soil environment system. |
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