UV-改进目标因子分析法对混用除草剂4组分的同时测定

Simultaneous Determination of Four-Components in Mixed Herbicides by Modified Target Factor Analysis-UV Spectrophotometry

组分间存在交互作用的 4种除草剂组成的混合样采用UV 目标因子分析法进行同时测定 ,结果相对误差较大。同样实验条件下 ,引入一个非零截距因子 ,进行改进目标因子分析 ,结果令人满意。改进目标因子分析 UV法 ,不经分离对 4种除草剂同时测定的回收率分别为百草枯 99 4 7%～ 10 2 0 2 %、氰草津 98 93%～ 10 2 75 %、异丙甲草胺 98 13%～ 10 2 6 5 %、莠去津 97 4 2 %～ 10 3 2 0 %。4种除草剂回收率的标准偏差分别为百草枯 1 16 %、氰草津 1 84 %、异丙甲草胺 1 84 %、莠去津 2 5 5 %。实验结果表明 ,改进目标因子分析方法对此类混用除草剂的同时测定具有较高的准确度和精密度。

In this paper, the modified target factor analysis-UV spectrophotometry method is established for simultaneous determination of paraquat CL, cyanzine, metolachlor and atrazine in mixed herbicides. The experimental results show that the recovery of each herbicide by MTFA is more accurate than by TFA. The recovery of paraquat CL ranges from 99.47% to 102.02%, of cyanzine 98.93%-102.75%, of metolachlor 98.13%-102.65% and of atrazine 97.42%-103.20%, with SD for the four components to be 1.16%, 1.84%, 1.84% and 2.55% respectively. All in all, the modified target factor analysis method can be used to determine accurately mixed herbicides which exhibits intrinsic interaction among components.