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Determination of chlorite,chlorate and perchlorate in water by ion chromatography

WANG Hui-xia;Hubei Provincial Institute for Food Supervision and Test;  
Objective To establish an analysis method for the determination of chlorite,chlorate and perchlorate in water by gradient elution- ion chromatography. Methods The target analytes were separated using high capacity and strong hydrophilic Ion Pac AS19 anion column,detected with suppressed conductivity detector,and KOH was used as eluent at the flow rate of1. 0 ml / min. To directly inject 200 μl samples through 0. 22 μm micro filtration membrane. Results This method could effectively isolate chlorite,chlorate,perchlorate and other ions. The calibration curve showed good linearity when the concentration of chlorite,chlorate and perchlorate was among the rage of 0. 015 mg / L- 1. 0 mg / L. The correlation coefficients were greater than 0. 999,and the recoveries were among 93. 0%- 103. 5%. The relative standard deviations( RSDs) were ≤3. 07% with the detection limit( S / N = 3) of 5 μg / L. Conclusion The method is sensitive,accurate,fast,simple and it is suitable for the simultaneous detection of chlorite,chlorate and perchlorate in water.
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