草甘膦的亚硝基化单扫描示波极谱法测定及其应用  

Single Sweep Oscillopolarographic Technique for the Determination of Glyphosate after Derivatization with Sodium Nitrite

作　　者：孙楠[1] 胡宝祥[1] 莫卫民[1] 

机构地区：[1]浙江工业大学化学工程与材料学院,杭州310032

出　　处：《农药》2007年第9期609-611,共3页Agrochemicals

基　　金：浙江省分析测试基金资助项目(02189)

摘　　要：草甘膦与亚硝酸钠在室温下发生亚硝基化反应,得到其亚硝基化衍生物N-亚硝基-N-膦酸甲基甘氨酸,在盐酸-醋酸钠(pH0.7)介质中该衍生物于-0.81V(vs.SCE)处产生一个灵敏的极谱波,其二阶导数峰峰电流I与草甘膦质量浓度在1.2×10-4～6.0×10-2g/L范围内呈良好的线性关系(r=0.9965,n=9),检测下限为9.6×10-5g/L(S/N=3),9次测定6.0×10-3g/L草甘膦相对标准偏差(RSD)为1.7%。该法简单、快速,可用于制剂与土壤样品中草甘膦的测定。A single sweep oscillopolarographic method for the determination of glyphosate has been proposed for the first time. At room temperature,glyphosate was converted to N-nitroso-N-（phosphonomethyl）glycine after derivatization with NaNO2. This N-nitroso derivative of glyphosate exhibited a sensitive cathodic peak at -0.81 V（vs. SCE） in HCl-NaAc buffer （pH 0.7）. The linear concentration range of application was 1.2×10^-4-6.0×10^-2 g/L of glyphosate,with a relative standard deviation of 1.7% （for a level of 6.0×10^-3 g/L） and a detection limit of 9.6×10^-5 g/L. The method was applied to the determination of glyphosate in the formulations and soil samples.

关 键 词：草甘膦 亚硝基化 单扫描示波极谱法 

分 类 号：TQ450.7[化学工程—农药化工]