离子色谱法测定饮用水中高氯酸盐

闫旭; 王瑜; 陈永艳; 吕佳; 张岚

doi:10.13421/j.cnki.hjwsxzz.2020.02.019

离子色谱法测定饮用水中高氯酸盐

Determination of Perchlorate in Drinking Water by Ion Chromatography

摘要

摘要:
采用离子色谱法对饮用水中的高氯酸盐进行检测。
方法水样经0.22 μm聚醚砜微孔滤膜过滤后上机检测，进样量为500 μL，使用IonPac AS20型色谱分析柱，配AERS 500型抑制器，柱温30.0℃，池温35.0℃，使用EGCⅢ型KOH淋洗液自动发生器，设定淋洗液浓度45.0 mmol/L，抑制器电流112 mA，流速1.00 mL/min等浓度淋洗。
结果方法检出限（S/N=3）为2.00 μg/L，定量限（S/N=10）为5.00 μg/L，高氯酸盐浓度在（5.00~140）μg/L范围内具有良好的线性（r=0.999 9）。对实际样品进行5.00、70.0和130 μg/L 3种浓度加标，连续进样6次，相对标准偏差（RSD）为1.21%~2.29%，加标回收率为86.2%~97.2%。
结论本方法快速、便捷、灵敏度高、易推广，可用于生活饮用水中的高氯酸盐的检测。

Abstract:
Objective To determine the content of perchlorate in drinking water by ion chromatography.
Methods The water samples were filtered by 0.22 μm microporous filter membrane and then determined directly on the instrument with a sample size of 500 μL. Chromatography was performed on an IonPac AS20 column and an AERS 500 inhibitor, with a column temperature of 30.0℃ and a pool temperature of 35.0℃. EGC III KOH eluent automatic generator was used to produce the eluent with a concentration of 45.0 mmol/L, and isocratic elution was performed at a suppressor current of 112 mA and a flow rate of 1.00 mL/min.
Results The method detection limit (S/N=3) was 2.00 μg/L, determination limit (S/N=10) was 5.00 μg/L. The results showed that perchlorate had good linearity within the range of (5.00~140) μg/L (r=0.999 9). Three concentrations of 5.00, 70.0, and 130 μg/L were added to the tipe water, samples, then injected continuously six times. The relative standard deviation was 1.21%~2.29%, and the recovery rate of standard addition was 86.2%~97.2%.
Conclusion This method is rapid, convenient, sensitive, and easy to promote, and therefore, it can be used to detect perchlorate in drinking water.

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