腐殖质和膨润土对有机磷农药吸附的色谱测定法  

Adsorption of organophosphorus pesticides on bentonite and humus by Chromatography

作　　者：朱丽珺[1] 张维[2] 胡辉[2] 张金池[2] 

机构地区：[1]南京林业大学理学院,江苏南京210037 [2]南京林业大学森林资源与环境学院,江苏南京210037

出　　处：《南京林业大学学报（自然科学版）》2011年第5期143-146,共4页Journal of Nanjing Forestry University：Natural Sciences Edition

基　　金：国家林业局"948"项目(2008-4-40);江苏省自然科学基金重点项目(BK2001208)

摘　　要：膨润土和腐殖质是土壤的重要组成成分,拥有复杂的结构和多种功能基团,对农药具有强烈的吸附作用。笔者采用AE.SE-54毛细管气相色谱法,以正十四烷为内标,对毒死蜱和三唑磷2种有效成分进行分析和定量;采用平衡法研究膨润土和腐殖质对毒死蜱和三唑磷的吸附规律。结果表明,方法标准偏差在0.15～0.61之间,变异系数在0.98～1.51%之间。毒死蜱的回收率为89.33%～124%,检出限为1.14×10-11 g/g;三唑磷的回收率为97%～116%,检出限为1.39×10-11 g/g。毒死蜱和三唑磷在腐殖质上的吸附均大于膨润土,并可用Freundlich模型和Langmuir模型拟合,膨润土对2种农药的等温吸附只可用Langmuir模型拟合。Bentonite and humus are very important parts in soil.They can adsorb pesticides intensively because of their complicated structure and many functional groups.Chlorpyrifos and triazophos were quantitatively analyzed by internal standard method using AE.SE-54 capillary column and n-tetradecane as the internal standard substance.The adsorption of chlorpyrifos and triazophos on bentonite and humus was studied by using the equilibrium oscillometry.The results showed that standard deviations were between 0.15 and 0.61;coefficients of variation were between 0.98 % and 1.51 %;the recoveries of chlorpyrifos and triazophos were between 89.33 %—124 % and 97 %—116 % respectively;the detect limits were 1.14×10-11 g/g and 1.39×10-11 g/g,respectively.Humus had great adsorption capacity than bentonite.The adsorption of chlorpyrifos and triazophos fitted well with the Langmuir equation on bentonite.On the other hand,it fitted well with both Freundlich equation and Langmuir equation on humus.

关 键 词：毒死蜱 三唑磷 腐殖质 膨润土 吸附 

分 类 号：S714[农业科学—林学] S153