Journal of Ecology and Rural Environment ›› 2020, Vol. 36 ›› Issue (7): 930-937.doi: 10.19741/j.issn.1673-4831.2019.0284

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Degradation and Adsorption of Four Non-agricultural Pesticides and Simulation of the Environmental Fate.

GUO Min1, ZHOU Lin-jun1, JI Gui-xiang1, WU Wen-zhu1, SHI Li-li1,2   

  1. 1. Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, Nanjing 210042, China;
    2. Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Nanjing 210044, China
  • Received:2019-04-24 Published:2020-07-18

Abstract: The hydrolysis, photolysis and adsorption behavior of s-bioallethrin, cypermethrin, spinosad and emamectin benzoate were systematically studied through in-laboratory simulation experiment, and the fate and transport fluxes of the 4 non-agricultural pesticides in environmental matrix were estimated using the Equilibrium Criterion (EQC) model based on the experimental data. The results show that at pH 4, 7 and 9, the hydrolysis half-life (t0.5) of s-bioallethrin was 77.00, 57.80 and 4.41 d; the t0.5 of cypermethrin was >180, 40.80 and 5.64 d; the t0.5 of spinosad was >180, >180 and 6.03 d; and the t0.5 of emamectin benzoate was >180, >180 and 46.20 d, respectively. The hydrolysis rates of the 4 non-agricultural pesticides were gradually enhanced with the increases of temperature and pH. Under the irradiation of xenon lamp, the photolysis half-life of cypermethrin, s-bioallethrin, emamectin benzoate and spinosad was 0.100, 0.738, 1.720 and 6.130 h, respectively. Molecule structure and physico-chemical characteristics were determinative factors affecting their photolysis rates. The adsorptions of 4 non-agricultural pesticides fit with Freundlich equation well in three soils, and pH, organic matter contents, cation exchange capacity and solubility in water significantly affected the adsorption. The predicted results show that soil is the dominant sink of cypermethrin, spinosad and emamectin benzoate, and holds more than 95.0% of these 3 non-agricultural pesticides under steady state and equilibrium conditions. The amounts of s-bioallethrin left in soil, water and air were 70.1%, 18.2% and 10.8%, respectively.

Key words: non-agricultural pesticide, hydrolysis, photolysis, adsorption, EQC model

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