离子色谱法测定饮用水中的8种阴离子

Detection of Eight Anions in Water by Ion-chromatography

利用MIC型离子色谱仪,对饮用水中F-、Cl-、NO2-、NO3-、PO43-和SO42-阴离子进行检测。采用Supp 5～4.0 mm*150 mm离子色谱柱,3.2 mol/L碳酸钠和1.0 mol/L碳酸氢钠淋洗液,抑制型电导检测。结果表明,利用这个离子色谱的最佳条件可以对饮用水中的8种阴离子同时准确快速地定性定量检测。F-、HCOO-、Cl-、NO2-、Br-、NO3-、PO43-和SO42-的相对标准偏差为:1.588%～3.270%,检出限为:0.012 mg/L～5.076 mg/L,回收率为:94.0%～105.2%。实验结果发现有水样中的F-含量超出国家标准。

8 kinds of drinking water were measured with the MIC ion chromatography. The chromatography conditions were used as follows： Supp 5-4.0 mm＊150 mm anion column, effluent of 3.2 mol/L sodium carbonate and 1.0 mol/L sodium bicarbonate and suppressed conductivity detection. The contents of F, HCOO, Cl, NO2, Br, NO3, PO43- and SO42 in drinking water were determined by ion chromatography （IC） . This method can determine the contents of eight kind of anions aqueous sample quickly and accurately. The relative standard deviations of the above eight kind of anions were 1.588%-3.270%, and the detection limits were 0.012 mg/L-5.076 mg/L while the percent recovery were 94.0%-105.2%. The results showed that the F- content of one mineral water sample exceeded the limit of the national standards.