酒石酸による鉄の紫外部吸収光度分析

概要

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Ultraviolet absorption spectrum of ferric-tartaric acid complex is studied in order to find the best condition for preparing of the complex salt to be used for analysis of iron. The absorption spectrum of ferric-tartaric acid is stable both in acidic and basic solutions. Variation in pH between 2.5 and 4.8 gives no influence upon the extinction between 350 mμ and 400 mμ, also the variation in pH between 8.0 and 10.9 does not affect the extinction between 260 mμ and 400 mμ. Presence of other elements does not remarkably influence the extinctions, follows Beer's law satisfactorily and remain unchanged for several days. Thus, these extinctions are suitable for rapid estimation of 0-40 p. p. m. of iron. Iron (1-40%) in rocks is determined by this method and the result agreed well with that of volumetric method. Molar ratio of Fe and tartaric acid of the complex salt is considered to be 1:3 according to the determination by continuous variation method.
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