铅污染对青紫泥田土壤中苄嘧磺隆降解的影响  

Effects of Pb Pollution on Degradation of Bensulfuron-methyl in a Purple Clayey Paddy Soil

作　　者：吴建军[1] Zaffar Malik 贾继元[1] 汪海珍[1] 徐建明[1] 

机构地区：[1]浙江大学环境与资源学院浙江省亚热带土壤与植物营养重点研究实验室,杭州310029

出　　处：《科技通报》2009年第5期684-688,共5页Bulletin of Science and Technology

基　　金：国家重点基础研究发展计划973项目(No.2005CB121104);国家自然科学基金项目(40371062;40425007);浙江省自然科学基金项目(Y504128;Y306275)

摘　　要：在实验室培养条件下,研究了Pb对苄嘧磺隆除草剂在青紫泥田土壤中的残留和消失动态。结果表明Pb抑制了土壤中苄嘧磺隆的降解,使残留量提高、消失率降低。至培养结束(第180天)时,不同Pb浓度处理下土壤中的残留量在0.18～0.57 mg·kg-1之间,消失率在91%～97%之间。苄嘧磺隆降解随培养时间的变化符合一级反应动力学方程,降解半衰期为33.2-57.2天。分析表明,300 mg·kg-1可能是Pb严重抑制苄嘧磺隆降解的临界浓度,而500 mg·kg-1则可能是Pb强烈抑制苄嘧磺隆降解的上限浓度。上述结果对制定土壤环境重金属容量标准具有较好的参考意义。A laboratory incubation experiment was conducted to study the effects of Pb pollution on residue and dissipation dynamics of bensulfuron-methyl herbicide in a purple clayey paddy soil. The results showed that Pb inhibited degradation of bensulfuron-methyl and thereby increased the amount of residue and decreased the dissipation rate of the herbicide. At the end of incubation,the residual amount of bensulfuron-methyl varied between 0.18-0.57 mg.ks^-1 in the soil with various Pb concentrations,and the dissipation rate varied between 91-97%. The relationship between residual amount and incubation time was well fitted to the first-order kinetic equation,and the half-life varied between 33.2-57.2 days. It is considered that 300 mg.kg^-1 of Pb may be the critical concentration significantly inhibiting the degradation of bensulfuron-methyl,while 500 mg.kg^-1 of Pb may be the up limit concentration strongly inhibiting the degradation of bensulfuron-methyl in the soil. Above results would be significant to establish environmental capacity standard for heavy metals in the soil.

关 键 词：铅 苄嘧磺隆 残留量 消失率 半衰期 

分 类 号：X131.3[环境科学与工程—环境科学]