Determination Of Anions In High Concentration Of Sodium Hydroxide Solutions By Ion Chromatography With Inline Neutralization Method

BUNSEKI KAGAKU(2020)

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摘要
The determination method of trace anions in high-concentration sodium hydroxide solutions by in-line neutralization-ion chromatography equipped with a neutralization device packed with a strongly acidic cation exchange resin was developed. The removal rate of sodium ions on the neutralization device determined by injecting 20 mu L of 25 % w/v sodium hydroxide was 99.99 % or more. The passed solution from the neutralization device was measured by ion chromatography using the anion concentration column method. The detection limit (S/N = 3) for chloride ions in the presented method was 0.19 mu g L-1, and the quantification limit (S/N = 10) was 0.63 mu g L-1. Chloride ion, chlorate ion and sulfate ion were detected in reagentgrade of sodium hydroxide solutions (concentration; 48 % w/v). The repeatability (RSD, n = 3) for each anion detected was less than 1 %. The proposed method was applied to the determination of anions in an industrial sodium hydroxide solution (concentration; 48 % w/v), and chloride ion, chlorate ion and sulfate ion were quantified with good accuracy. The repeatability (RSD, n = 3) for each anion was also less than 1 %, and the recovery rates for spiked three anions were from 101.1 to 102.6 %.
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关键词
inline neutralization, ion chromatography, industrial sodium hydroxide, chloride ion, sulfate ion
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