关键词: 土壤修复, 农药污染地块, 表面活性剂, 增溶

Abstract: Heterocyclic pesticides were organic pollutants presented in pesticide-contaminated sites， which had stable properties and could be adsorbed on the surface of soil particles for a long time， which made it difficult to repair the site polluted by heterocyclic pesticides. In order to find an effective remediation method for land contaminated by heterocyclic pesticides， the solubilization and elution effects of sodium humate and sodium dodecyl benzene sulfonate （SDBS） on carbendazim and organic matter in soil and CODCr and ammonia nitrogen in leachate were studied by taking a typical heterocyclic pesticide-contaminated site as the research focus. The results showed that 5 mg/L sodium humate had the most significant solubilization effect on carbendazim and organic matter， and its removal rates could reach 81% and 82%， respectively. SDBS had the most significant solubilization effect on carbendazim in soil with a removal rate of 85% at 780 mg/L， and the solubilization effect on organic matter was the most significant at 195 mg/L with a removal rate of 72%. In leachate， 15 mg/L sodium humate had the best effect on CODCr in the initial stage and total leaching process， 5 mg/L sodium humate had the best effect on the total leaching of ammonia nitrogen. Overall， 15 mg/L sodium humate had a better effect than SDBS.

Key words: soil remediation, pesticide contaminated sites, surfactant, solubilization