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目的建立离子色谱检测饮用水中草甘膦的方法。方法以IonPacAS19(4 mm)为分析柱,EGC在线产生KOH为淋洗液,抑制电导进行检测,用草甘膦的峰面积进行定量。结果草甘膦的检出限(S/N=3)是0.015 mg/L,线性相关系数是0.999 9(0.05 mg/L~2.0 mg/L);样品加标回收率是97.7%(RSD:0.016%;0.35 mg/L~1.05 mg/L);浓度为0.1 mg/L及0.5 mg/L草甘膦样品溶液分别存放在玻璃瓶和聚丙烯塑料瓶中,连续10 d检测峰面积及保留时间,差异均无统计学意义(P>0.05);F~-等13种阴离子对饮用水中草甘膦的检测无干扰;阳离子Ca~(2+)和Cu~(2+)对其检测无影响;高浓度Cl~-对其检测有一定影响。结论该方法具有灵敏度高,操作简单,重现性好,能够快速准确检测饮用水中草甘膦的浓度。
Objective To establish a method for the determination of glyphosate in drinking water by ion chromatography. Methods IonPacAS19 (4 mm) was used as the analytical column. EGC was used to generate KOH as eluent on-line. The conductance was monitored for inhibition and the peak area of glyphosate was used for quantification. Results The limit of detection (S / N = 3) of glyphosate was 0.015 mg / L and the linear correlation coefficient was 0.999 9 (0.05 mg / L ~ 2.0 mg / L) 0.016%; 0.35 mg / L ~ 1.05 mg / L). The samples of 0.1 mg / L and 0.5 mg / L glyphosate were stored in glass bottles and polypropylene plastic bottles respectively. (P> 0.05). The 13 anions such as F ~ - did not interfere with the detection of glyphosate in drinking water. The detections of Ca ~ (2+) and Cu ~ (2+) No effect; high concentrations of Cl ~ - its detection has a certain impact. Conclusion The method has the advantages of high sensitivity, simple operation, good reproducibility and rapid and accurate detection of glyphosate in drinking water.