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The diazo component of o-hydroxy heterocyclic azo compounds showed a remarkable effect on the retention of their neutral complexes of iron and nickel as a precolumn derivatizing reagent in the separation of metal ions by RP-HPLC using an octadecyl-bonded silica gel column. High resolutions of iron and nickel complexes were obtained with pyrimidyl derivatives. Acetonitrile-water or acetone-water was...
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