| 几种低分子量有机酸对红壤中DDTs类物质释放动力学的影响 |
| 摘要点击 1578 全文点击 1067 投稿时间：2005-09-24 修订日期：2005-11-28 |
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| 中文关键词 有机酸 滴滴涕 动力学 释放 |
| 英文关键词 organic acids DDTs kinetic release |
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| 中文摘要 |
| 采用自行设计的动力学试验装置,系统研究了3种低分子量有机酸(草酸、酒石酸和柠檬酸)和水对红壤中滴滴涕(DDTs)类物质的释放动力学行为.结果表明:10 mmol/L的低分子量有机酸可使DDTs类物质的释放百分率相对于水提高15～18个百分点,特别在淋洗液的前250mL更为明显.水对DDTs类物质的释放动力学数据可用表观一级动力学方程很好拟合(R2>0.99,p<0.000 1),说明DDTs的释放可能以土壤矿物表面扩散为主,而有机酸存在体系中的该类物质的释放却更好符合抛物线方程、双常数方程,说明低分子量有机酸的存在使DDTs的释放机理复杂化,这可能与有机酸对矿物的溶解、对矿物表面固有有机质结构的干扰有关. |
| 英文摘要 |
| The kinetic release behavior of DDTs from red soil with three kinds of low-molecular-weight(LMW) organic acids solution and water leaching was investigated by kinetic device designed.The results show that the release percentage of DDTs from red soil by LMW organic acid can increase by 15%～18% more than that by water,especially for the initial 250 mL leaching solution.When using water as leaching solution,the data of release kinetics of DDTs from red soil conformed to the apparently first dynamics equation(R2>0.99,p<(0.000 1)),it implied that the surface diffuse of soil mineral is primary release mechanism of DDTs from red soil in water leaching system.The kinetic release behavior of DDTs in LMW organic acid leaching system can be described by parabola diffuse equation,double constant equation or Elovich equation.It implied that the LMW organic acids induced the complication of the release mechanisms of DDTs from red soil,this maybe related to the dissolution of soil mineral surface and structure change of inherent organic material that coating onto the soil mineral surface induced by LMW organic acid. |
