A ternary complex system for the reversed-phase chromatography of chromate

A new ternary complex system was described. At pH 4.8 diphenylcarbazon formed ternary complexes with metal ions (Cr(VI) and V(V)) and hexadecyltrimethyl ammonium bromide (cetyltrimethyl ammonium bromide, CTAB). The ternary complex of chromate was separated from that of vanadate by means of liquid chromatography using a mobile phase of acetonitrile-acetone-water (85:5:20, vv) containing 0.002 M CTAB. The analytical sensitivity of the complex of chromate could be raised further if the medium of the injection solution is transferred in methanol by solid-phase extraction.