Quantitative determination of weak acids, weak bases and their salts by the absorbance ratio method

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Other Title
  • 吸光度比法による弱酸, 弱塩基および塩類の定量
  • キュウコウドヒホウ ニ ヨル ジャクサン , ジャク エンキ オヨビ エンルイ ノ テイリョウ
  • Difference quantitative determination. II
  • 差定量法の研究 (第2報)

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Description

The absorbance ratio method was applied to the quantitative determination of 35 kinds of substances (poly-basic inorganic acids and their salts, alkali salts of organic acids, weak bases and their hydrochlorides, sulfamines and amino acids), which were difficult to be determined precisely by ordinary direct titrations. The determinations were carried out easily, rapidly and accurately, and the standard deviations for all substances tested were within 0.1%.<BR>The determination procedure is as follows : A sample solution is prepared according to Table I, absorbances at λ1 and λ2 are measured, and the γ value is calculated from formula (1). Then the χ value is estimated from the γ value and the working curve which is obtained from Table II, and the content z is calculated from formula (5), where, <BR>S : the weight of the sample taken (mg).<BR>C : the equivalent of the sample (mg/ml).<BR>f : the normality factor of the standard solution.<BR>V' : the volume of the standard solution added (ml).<BR>The standard solution is usually added with a whole pipet, and then the range of S is given by formula (3) and Table II, where, <BR>χ1 and χ2 : the lower and the upper limits of the suitable range of χ.<BR>z1 and z2 : the lower and the upper limits of the probable content.<BR>If the weight of sample is not within the range of S, the pipet or the buret shown in Fig. 1 is successfully used in place of a whole pipet.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 17 (6), 683-703, 1968

    The Japan Society for Analytical Chemistry

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