Indirect spectrophotometric determination of indium with copper ethylenediaminetetraacetate

Copper ethylenediaminetetraacetate shows a light absorption at 700750 mμ. The molar absorptivity is 91 at pH 4.3. At pH 4, apparent formation constants, log K, for CuY2- and InY- are 10.36 and 16.5, respectively, where Y is an ethylenediaminetetraacetate anion. Consequently, the following reaction (...

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Bibliographic Details
Published inBUNSEKI KAGAKU Vol. 13; no. 5; pp. 429 - 433
Main Authors ONISHI, Hiroshi, NAGAI, Hitoshi
Format Journal Article
LanguageJapanese
Published The Japan Society for Analytical Chemistry 05.05.1964
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Summary:Copper ethylenediaminetetraacetate shows a light absorption at 700750 mμ. The molar absorptivity is 91 at pH 4.3. At pH 4, apparent formation constants, log K, for CuY2- and InY- are 10.36 and 16.5, respectively, where Y is an ethylenediaminetetraacetate anion. Consequently, the following reaction (replacement or displacement) takes place : In3++ CuY2-_??_ InY-+Cu2+. Therefore, indium can be determined by measuring the decrease in absorbance of CuY2- at 740 mμ. The decrease in absorbance was measured by measuring the absorbance of a reagent blank containing CuY2- alone against a sample solution containing indium. CuY2- was prepared by mixing equal moles of Cu2+ and ethylenediaminetetraacetic acid disodium salt. Commercially available copper ethylenediaminetetraacetate also serves the purpose. At pH 4.3, using 100 mg of Na2CuY·4H2O, 5 to 20 mg of indium in 25 ml can be determined with good precision. Apparent molar absorptivity for indium is -65.
ISSN:0525-1931
DOI:10.2116/bunsekikagaku.13.429