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 hexade cyltrimethyl ammonium bromide (cetyltrimethyl ammonium bromide, CTAB). The ternary complex of chromate was separated from that of vanadate b y means of liquid chromatography using a mobile phase of acetonitrile- acetone-water (85:5:20, v/v) containing 0.002 M CTAB. The analytical s ensitivity of the complex of chromate could be raised further if the m edium of the injection solution is transferred in methanol by solid-ph ase extraction.