Rapid determination of seven inorganic anions by high pressure ion chromatography in drinking water

doi:10.3724/SP.J.1123.2016.06024

Abstract

Abstract:

A new method was developed for the determination of inorganic anions in drinking water by high pressure ion chromatography (HPIC). Water samples were analyzed directly after filtered by 0.22 μm nylon membrane. Seven anions (F^-, Cl^-, Br^-, NO₂^-, NO₃^-, SO₄^2- and PO₄^3-) were separated well in 5 min by Dionex Integrion HPIC and AS22-Fast-4 μm anion exchange column. In this study, 4.5 mmol/L sodium carbonate and 1.4 mmol/L sodium bicarbonate were used as the mobile phases with the flow rate of 2 mL/min. The limits of detection of the analytes (S/N=3) ranged from 0.007 to 0.07 mg/L, and they all had good linear relationships (r≥0.999) in a wide range with good relative standard deviations (RSDs≤0.48%, n=8). The recoveries of the seven anions in drinking water ranged in 91.4%-109.7% with RSDs of 0.30%-0.45% (n=5). The developed method was applied to analyze the drinking water samples from seven tap waterworks. The results showed that six anions were detected in these samples, and Cl^-, NO₃^- and SO₄^2- were the predominant anions. The method is simple, rapid, accurate, reliable, and suitable for the rapid determination of common anions in water samples.

Key words: anions, drinking water, high pressure ion chromatography (HPIC), rapid determination

CLC Number:

O658

SONG Xiaowei, GAO Lihong, SHI Yali, CAI Yaqi, LI Renyong. Rapid determination of seven inorganic anions by high pressure ion chromatography in drinking water[J]. Chinese Journal of Chromatography, 2016, 34(10): 968-971.

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