New Spectrophotometric Determination of Chromium and Cobalt with Disodium Ethylenediaminetetraacetate

Abstract

The light absorptions of complexes between EDTA and various metallic ions were measured by using Beckmann model DU spectrophotometer and it was found that a new double complex consisting of EDTA, Cr_2O_7^ and Co_ had strong absorbancy. Utilizing the nature of this complex spectrophotometric determinations of chromium and cobalt were investigated and 5~30γ/ml of chromium and 10~80γ/ml of cobalt could be determined under certain conditions. The composition of this complex was suggested to be (Co-EDTA)_7Cr_2O_7

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