Sulphonated azo-dyes as extractive metallochromic reagents.
A survey has been made of analytically useful extractable ion-pair complexes that are formed by the use of a series of metallochromic indicator-metal complexes in conjunction with quaternary ammonium ions. The reagents were o,o'-dihydroxyazo dyes and azo-oxines.
Woodward
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Department of Chemistry University of Arizona Tucson, Arizona 85721, U.S.A.
Freiser
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