1965 Volume 38 Issue 11 Pages 2010-2011
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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