Determination of Anions in High Concentration of Sodium Hydroxide Solutions by Ion Chromatography with Inline Neutralization Method

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Other Title
  • インライン中和−イオンクロマトグラフィーによる高濃度水酸化ナトリウム溶液中の陰イオンの定量
  • インライン中和-イオンクロマトグラフィーによる高濃度水酸化ナトリウム溶液中の陰イオンの定量
  • インライン チュウワ-イオンクロマトグラフィー ニ ヨル コウノウド スイサンカ ナトリウム ヨウエキ チュウ ノ インイオン ノ テイリョウ

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Description

<p>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 μL 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 μg L−1, and the quantification limit (S/N = 10) was 0.63 μg L−1. Chloride ion, chlorate ion and sulfate ion were detected in reagent-grade 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 %.</p>

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 69 (6), 291-298, 2020-06-05

    The Japan Society for Analytical Chemistry

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