Ion chromatography of selenite and selenate using column packing with poly(vinyl alcohol) gel

ISOZAKI Akinori, YOSHIKAWA Kenji, NAGASHIMA Hisomu

doi:10.2116/bunsekikagaku.53.25

A method for the determination of 9 inorganic anions was investigated by ion chromatography using a poly(vinyl alcohol) column (Shodex IC SI-90 4E) with suppressed conductivity detection. The optimal mobile phase was 6.0 mM sodium tetraborate and 20.0 mM boric acid for the simultaneous determination a mixture of anions (F⁻, Cl⁻, NO₂⁻, Br⁻, NO₃⁻, SeO₃²⁻, HPO₄²⁻, SO₄²⁻, SeO₄²⁻) under the following conditions: flow rate, 0.8 ml/min; scavenger, 12.5 mM sulfuric acid; column temperature, 40°C. The 9 anions were efficiently separated in about 20 minutes. Calibration curves from the peak areas of 9 anions were linear with high correlation coefficients of more than 0.999, and the relative standard deviations (RSD) of the peak areas were about 1% from 10 repeated measurements. The limit of detection was from 1∼30 ng/ml for 7 anions, 28 ng/ml for SeO₃²⁻ ion, and 17 ng/ml for SeO₄²⁻ ion. This method was applied to the determination of selenium in organic selenium compounds. The content of selenium by this method was in good agreement with that calculated from the molecular formula. It was found that selenium in an absorbent from the combustion of a sample exists only in the selenite form.<br>

Ion chromatography of selenite and selenate using column packing with poly(vinyl alcohol) gel

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