吸光度比法による弱酸,弱塩基および塩類の定量

概要

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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%. 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, S : the weight of the sample taken (mg). C : the equivalent of the sample (mg/ml). f : the normality factor of the standard solution. V' : the volume of the standard solution added (ml). 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, χ1 and χ2 : the lower and the upper limits of the suitable range of χ. z1 and z2 : the lower and the upper limits of the probable content. 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.
社団法人日本分析化学会の論文