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1、中国科技论文在线http://www.paper.edu.cn#苯达松在三种典型土壤中的吸附与淋溶**戴庆丽，马鑫，吴祥为，唐俊，李学德，花日茂（安徽农业大学资源与环境学院，安徽省农产品安全重点实验室）5摘要：为明确苯达松在土壤中的吸附迁移规律，采用批量平衡振荡法和土柱淋溶法研究了苯达松在安徽宣城红壤、亳州潮土和砀山砂土中的吸附及淋溶特性，探讨了土壤理化性质对苯达松在土壤中吸附、淋溶行为的影响。吸附结果表明，苯达松在不同pH的宣城红壤、亳州潮土和砀山砂土中的吸附特性更符合线性方程，Kd值分别为0.981-1.096、0.611-0.882和100.455-0.566，吸附性大小次序为：
2、砀山砂土＜亳州潮土＜宣城红壤。土壤有机质含量、土壤粘粒与苯达松的土壤吸附性呈明显正相关性；苯达松在3种供试土壤中的吸附自由能为-1-2.040~-3.297kJ•mol，表明吸附机理主要是物理吸附。土柱淋溶结果表明，苯达松在土壤中具有较强的淋溶性，苯达松分别在砂土、潮土和红壤中25-30、25-30、15-20cm深度淋溶滞留量最大，淋溶性大小为：砀山砂土＞亳州潮土＞宣城红壤，与吸附试验结果相一致。农15田土壤中苯达松对地下水污染具有潜在风险，应引起足够重视。关键词：苯达松；吸附；淋溶；土壤AdsorptionandleachingofbentazoneinthreesoilsDaiQ
3、ingli,MaXin,WuXiangwei,TangJun,LiXuede,HuaRimao20(SchoolofResorucesandEnvoronment,KeylabofAnhuiAgro-producessafety)Abstract:Tostudytheadsorptionandleachingbehaviorofbentazoneinsoil,Xuanchengredsoil,BozhoualluvialsoilandDangshansandysoilwereconductedtoinvestigatetheeffectofsoilpropertiesontheadso
4、rptionandleachingofbentazoneusingbatchequilibriummethodandsoilcolumnleachingmethod.TheresultsshowedthattheadsorptionofbentazoneeindifferentpH25valueofXuanchengredsoil,BozhoufluvoaquicsoilandDangshansandysoilwerealsoconformedtothelinearequation,Kdvaluesrangedfrom0.981-1.096,0.611-0.882and0.455-0.
5、566,respectively.TheadsorptioncapacitieswereXuanchengredsoil>Bozhoualluvialsoil>Dangshansandysoil.TheKdvalueswerewellcorrelatedtoorganicmattercontentsofthesoilandsoilclay.Moreover,theadsorptionfreeenergyofbentazoneinthreetestedsoilsranged30from-2.040~-3.297kJ•mol-1,indicatedthattheadsorptioncoul
6、dbelargelyattributedtothephysicaladsorption.Inthesoilcolumn，theresultsshowedthattheleachingcapacityofbentazonewasobviousandthemaximumcontrationsofbentazoneeinXuanchengredsoilcolumn,BozhoualluvialsoilcolumnandDangshansandysoilcolumnwereinthedepthof25-30,25-30,15-20cm,respectively.Theleachingabili
7、tyofthreesoilswasXuanchengredsoil＜Bozhoualluvialsoil＜35Dangshansandysoil，whichwasinaccordancewiththeadsorptioncapacity．Thesesresultsindicatedthatapplicationofbentazonemightresultintheriskofgroundwater.Keywords:bentazone;adso
