Abstract
The performance of six 2-quinolylazo compounds (HL) as precolumn derivatizing reagents for reversed-phase high-performance liquid chromatographic separation of metal ions using an ODS column was studied. Four metal ions were detected as [Fe IIL 2], [Co IIIL 2] +, [NiL 2] and [Cu IIL] +, respectively. Addition of thiocyanate ion to the mobile phase enhanced the retention of [Cu IIL] + to give a better separation from the solvent peak, compared with other anions. Phenol derivatives afforded a shorter analytical time than naphthol derivatives. Replacement of acetonitrile by acetone as organic modifier reduced the retention of Fe, Ni and Co more than that of a free ligand and Cu, and induced the change of elution order from Cu, Co, HL, Ni, Fe to Co, Cu, Ni, Fe, HL.
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