Chinese Journal of Chromatography

Chinese Journal of Chromatography

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Application of High Performance Anion Exchange Chromatography for Trace Analysis of Polarizable Anions

MO Shumin1,2, LIANG Lina1, CAI Yaqi1, MOU Shifen1, WEN Meijuan2   

  1. 1. State Key Laboratory of Environmental Chemistry and Ecotoxicity, Research Center for Eco-Environmental Sciences, The Chinese Academy of Sciences, Beijing 100085, China; 2. Department of Chemistry, University of Science and Technology Beijing, Beijing 100083, China
  • Received:2004-11-01 Revised:1900-01-01 Online:2005-11-30 Published:1987-12-25

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Abstract:

Polarizable anions such as Br-, S2O2-3, I- and SCN- were separated using 45 mmol/L sodium hydroxide solution as the mobile phase on a high hydrophilic IonPac AS16 column. With a pulsed amperometric detector, the detection limits were 0.5, 0.2, 0.05 and 2 μg/L (25.0 μL injected, signal-to-noise ratio of 3) for Br-, S2O2-3, I- and SCN-. The relative standard deviation (RSD) range of trace anions was from 0.8% to 3.7% (n=9). Under the same chromatographic conditions, these anions were also determined using a suppressed conductivity detector and the detection limits were 1, 1, 2 and 10 μg/L (25 μL injected, signal-to-noise ratio of 3), respectively. The RSD range was from 0.9% to 4.7% (n=9). Comparing a pulsed amperometric detector with a conductivity detector, the former is 2 to 40 times more sensitive than the latter. For the determination of polarizable anions, a pulsed amperometric detector has higher selectivity, precision and sensitivity.

Key words: polarizable anions, pulsed amperometric detector, suppressed conductivity detectorI
, high performance anion exchange chromatography