融点降下法による純度の簡易測定法(<特集>医薬品の分析)

概要

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In this study, melting curve which shows the relationship between temperature and light transmittance of the sample, was obtained by use of a Mettler FP-1 automatic melting point instrument. Temperature was elevated at a rate of 0.02 K/min near the beginning of melting. In the presence of reference material, the purity of a sample could be evaluated from the comparison of melting point lowering rates of the sample and the reference material. On the other hand, in the absence of the reference, the purity of a sample could be evaluated by a modified comparative method. This method is based on the result that the melting point of a pure substance coincides with the temperature of intersecting point of two lines, which are obtained by plotting melting points and half changed points of melting curves of samples containing known ratios of contaminant.
社団法人日本分析化学会の論文
1986-03-05