鱼藤酮在3种土壤中的吸附-解吸附特性

为了综合评价鱼藤酮在土壤环境中的吸附-解吸附特性，采用批量平衡法，系统研究了鱼藤酮在砂壤土、黏壤土及壤土3种农业土壤中的吸附-解吸附行为。结果表明，鱼藤酮在3种土壤中的吸附-解吸附行为符合Freundlich模型 (R2≥0.946 8)，吸附常数 (K_f-ads) 在1.52~11.39之间，吸附能力为:黏壤土 > 砂壤土 > 壤土；而解吸附常数 (K_f-des) 在1.02~4.55之间，解吸附强弱次序为壤土 > 黏壤土 > 砂壤土。鱼藤酮在砂壤土、黏壤土和壤土3种土壤中有机碳吸附常数 (K_OC) 分别为982、101 7和219，而滞后系数 (H) 分别为0.687 3、0.556 9和0.892 3，表明鱼藤酮在黏壤土及砂壤土中移动性较弱，有正迟滞作用，而在壤土中移动性较强，无迟滞作用。该研究将对鱼藤酮的环境风险评估具有一定的理论指导意义。

Adsorption and desorption behavior of rotenone in three different soils

Static equilibrium experiments were conducted to investigate the adsorption and desorption behavior of rotenone in three different agricultural soils including sandy loam, clay loam and loam. All adsorption and desorption isotherms could be best described by the Freundlich model (R2≥0.946 8). The results showed that the adsorption constant (K_f-ads) of rotenone in three soils were from 1.52 to 11.39. The order of the adsorption capacity of the soils to rotenone was: clay loam> sandy loam> loam. The desorption constant (K_f-des) of rotenone were from 1.02 to 4.55. The order of the desorption capacity was: loam> clay loam> sandy loam. The organic carbon distribution constant (K_OC) of rotenone in three soils were 982, 1 017 and 219 while the hysteresis index (H) were 0.687 3, 0.556 9 and 0.892 3, respectively. The research indicated that rotenone was not easy to migrate in clay loam and sandy loam which exhibits hysteresis. On the contrast, it can migrate easily in loam with no hysteresis. The research provides theoretical guidance for the safety evaluation of rotenone in soils.