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.

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http://dx.doi.org/10.1016/0039-9140(73)80172-9DOI Listing

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