Insights on leaching, adsorption–desorption of spirotetramat and its four metabolites on “Third Pole” pollution-free area:Qinghai–Tibet Plateau

IF 5.4 Q2 ENGINEERING, ENVIRONMENTAL
Hongyu Chen , Wei Li , Haixia Zhu, Shuo Shen
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Abstract

The use of pesticides has led to increased soil and water pollution, which has even affected the world's third pole, the Tibetan Plateau. In this study, the adsorption and desorption experiments of spirotetramat on three typical soils were conducted to investigate the migration and leaching risk of pesticides in the Qinghai-Tibet Plateau ecosystem. We used batch equilibrium technique for adsorption-desorption experiments and evaluated leaching risk by computational simulation experiments under laboratory conditions. The Freundlich adsorption constants Kf of spirotetramat in the soils of Haidong, Haixi and Haibei were as follows: At 22.26, 15.13 and 6.85, the maximum adsorption capacity Cmax was 434.80, 217.40 and 169.50 mg kg-1, the average adsorption rates were 77.92, 54.27 and 39.13 %, and the desorption constants (Kf) were 43.27, 22.35 and 11.56, respectively. The hysteresis coefficient HI>1.00 in the soil of Haidong and Haixi, and 0.70<HI<1.00 in the soil of Haibei, indicating that with the increase of temperature, the adsorption capacity of the tested soil for spirotetramat decreases, which increases the migration risk of pesticides. The desorption of spirotetramat in the soil of Haidong and Haixi has a lag. The GUS values of spirotetramat in the soils of Haidong, Haixi and Haibei were 1.15, 1.63 and 1.72, respectively, which were all lower than 1.80, indicating that spirotetramat was a non-leaching pesticide, and the leaching risk of spirotetramat in the soils of Qinghai was small, and the potential harm to groundwater was at a low level.

Abstract Image

对青藏高原 "第三极 "无污染地区螺环酯及其四种代谢物的浸出、吸附和解吸的深入研究
农药的使用导致土壤和水污染加剧,甚至影响到世界第三极青藏高原。本研究通过螺环菌酯在三种典型土壤上的吸附和解吸实验,探讨了农药在青藏高原生态系统中的迁移和淋溶风险。我们采用批次平衡技术进行了吸附-解吸实验,并在实验室条件下通过计算模拟实验评估了浸出风险。螺环酯在海东、海西和海北土壤中的 Freundlich 吸附常数 Kf 如下:在22.26、15.13和6.85条件下,最大吸附容量Cmax分别为434.80、217.40和169.50 mg kg-1,平均吸附率分别为77.92%、54.27%和39.13%,解吸常数(Kf)分别为43.27、22.35和11.56。海东和海西土壤的滞后系数HI>1.00,海北土壤的滞后系数HI<1.00,分别为0.70<和0.70<,说明随着温度的升高,受试土壤对螺虫酯的吸附能力降低,增加了农药的迁移风险。海东和海西土壤对螺虫酯的解吸有一定的滞后性。螺虫酯在海东、海西和海北土壤中的 GUS 值分别为 1.15、1.63 和 1.72,均低于 1.80,表明螺虫酯为非淋溶农药,螺虫酯在青海土壤中的淋溶风险较小,对地下水的潜在危害处于较低水平。
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来源期刊
Journal of hazardous materials advances
Journal of hazardous materials advances Environmental Engineering
CiteScore
4.80
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