Chelatometric determination of calcium and magnesium in the presence of large amounts of sodium chloride

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  • SATO Hisakuni
    Laboratory for Industrial Analytical Chemistry, Faculty of Engineering, Yokohama National University

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Other Title
  • 多量の塩化ナトリウムと共存するカルシウムとマグネシウムのキレート滴定
  • タリョウ ノ エンカ ナトリウム ト キョウゾンスル カルシウム ト マグネシ

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Description

Calcium is titrated, at first, by ethyleneglycol-bis(2-aminoethylether)-N, N, N', N'-tetraacetic acid (EGTA) with phthalein complexon as an indicator in glycine-KOH buffer at pH 11. The end-point is located at the break point on the photometric titration curve. Magnesium is titrated separately by ethylenediaminetetraacetic acid (EDTA) with Calmagite as an indicator at pH 10. The end-point can be obtained by processing the photometric titration data with a digital computer. The influences of calcium and sodium ions to the EDTA titration of magnesium ion were examined with theoretical calculations and with experimental works. In the present method, calcium and magnesium {(10-410-3) M} can be determined with a relative standard deviation of 1% or less in the presence of 1 M sodium chloride. Present method was applied to the industrial salts.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 25 (9), 616-620, 1976

    The Japan Society for Analytical Chemistry

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