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Adsorption and Desorption of Carbendazim and Thiamethoxam in Five Different Agricultural Soils

Han, Lingxi, Ge, Qiqing, Mei, Jiajia, Cui, Yanli, Xue, Yongfei, Yu, Yunlong, Fang, Hua
Bulletin of environmental contamination and toxicology 2019 v.102 no.4 pp. 550-554
adsorption, agricultural soils, carbendazim, cation exchange capacity, desorption, hysteresis, soil organic matter, sorption isotherms, thiamethoxam
The adsorption and desorption behaviors of carbendazim (CBD) and thiamethoxam (TMX) were systematically studied in five different agricultural soils. The adsorption and desorption isotherms of CBD and TMX in the five different soils were fitted well by the Freundlich model. The Freundlich adsorption coefficient (Kfᵃᵈˢ) and Freundlich desorption coefficient (Kfᵈᵉˢ) of CBD in the five different soils were 1.46–19.53 and 1.81–3.33, respectively. The corresponding values of TMX were 1.19–4.03 and 2.07–6.45, respectively. The adsorption affinity and desorption ability of the five different soils for CBD and TMX depended mainly on soil organic matter content (OMC) and cation exchange capacity (CEC). Desorption hysteresis occurred in the desorption process of CBD and TMX in the five different agricultural soils, especially for TMX. It is concluded that the adsorption–desorption ability of CBD was much higher than that of TMX in the five different agricultural soils, which was attributed to soil OMC and CEC.