Shea P J, Machacek T A, Comfort S D
University of Nebraska-Lincoln, Lincoln, NE 68583-0915, USA.
Environ Pollut. 2004 Nov;132(2):183-8. doi: 10.1016/j.envpol.2004.05.003.
High pesticide concentrations in soil from spills or discharges can result in point-source contamination of ground and surface waters. Cost-effective technologies are needed for on-site treatment that meet clean-up goals and restore soil function. Remediation is particularly challenging when a mixture of pesticides is present. Zerovalent iron (Fe0) has been shown to promote reductive dechlorination and nitro group reduction of a wide range of contaminants in soil and water. We employed Fe0 for on-site treatment of soil containing > 1000 mg metolachlor, > 55 mg alachlor, > 64 mg atrazine, > 35 mg pendimethalin, and > 10 mg chlorpyrifos kg(-1). While concentrations were highly variable within the windrowed soil, treatment with 5% (w/w) Fe0 resulted in > 60% destruction of the five pesticides within 90 d and increased to > 90% when 2% (w/w) Al2(SO4)3 was added to the Fe0. GC/MS analysis confirmed dechlorination of metolachlor and alachlor during treatment. Our observations support the use of Fe0 for ex situ treatment of pesticide-contaminated soil.
农药泄漏或排放导致土壤中农药浓度过高，可能会造成地下水和地表水的点源污染。需要采用具有成本效益的现场处理技术，以实现清理目标并恢复土壤功能。当存在多种农药混合物时，修复工作尤其具有挑战性。零价铁（Fe0）已被证明可促进土壤和水中多种污染物的还原脱氯和硝基还原。我们使用Fe0对含有超过1000毫克异丙甲草胺、超过55毫克甲草胺、超过64毫克莠去津、超过35毫克二甲戊灵和超过10毫克毒死蜱/千克的土壤进行现场处理。虽然在堆积土壤中浓度变化很大，但用5%（w/w）Fe0处理在90天内导致五种农药的降解率超过60%，当向Fe0中添加2%（w/w）硫酸铝时，降解率提高到超过90%。气相色谱/质谱分析证实处理过程中异丙甲草胺和甲草胺发生了脱氯反应。我们的观察结果支持使用Fe0对受农药污染的土壤进行异位处理。
