[目的]对草甘膦钠盐和二甲胺盐水剂中的钠离子和二甲胺盐离子进行定量分析。[方法]用Dionex Ion Pac CS12A阳离子分析柱和电导检测器,外标法定量分析草甘膦钠盐和二甲胺盐离子。[结果]钠离子和二甲胺盐离子的变异系数均为1.1%,平均回收率为99.5%和100.2%。[结论]该方法操作简便、灵敏,结果可靠。 [Objective] To quantitatively analyze sodium ion and dimethylamine salt in glyphosate sodium salt and dimethylamine salt water agent. [Method] The Dionex Ion Pac CS12A cation analytical column and conductivity detector were used for the quantitative analysis of glyphosate sodium salt and dimethylamine salt ion by external standard method. [Result] The coefficients of variation of sodium ion and dimethylamine salt were both 1.1% and the average recoveries were 99.5% and 100.2% respectively. [Conclusion] The method is simple, sensitive and reliable.