Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
The Spectrophotometric Determination of Chromium with 2-Hydroxy-1-(2-hydroxy-4-sulfo-1-naphthylazo)-naphthalein (Sodium Salt)
Katsuya UesugiYukiteru Katsube
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1965 Volume 38 Issue 11 Pages 2010-2011

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Abstract

A spectrophotometric method for the determination of traces of chromium (III) with 2-hydroxy-1-(2-hydroxy-4-sulfo-1-naphthylazo)-naphthalein has been described. Beer’s law is obeyed up to 1.2 p. p.m. of chromium. The spectrophotometric sensitivity is 0.0013 μg. Cr/cm2 based on an absorbance of 0.001 unit at 630 mμ. The accuracy and precision are satisfactory. The interference of foreign ions can be avoided by 8-hydroxyquinoline chloroform extraction or by acetylacetone chloroform extraction.

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