PRECONCENTRATION AND SEPARATION OF METAL-IONS USING A PYRIDAZINE DERIVATIVE IMMOBILIZED GLASS-BEADS

We synthesized a metal chelating sorbent by immobilizing a pyridazine derivative on glass beads and investigated the adsorption and separati on behavior of the beads for metal ions. The beads were synthesized by reacting glass beads (amino-aryl-CPG) with 3-chloropyridazine-6-carbo xylic acid hydrazide in toluene at 110-degrees-C for 12 h. The exchang e capacity of the beads for copper determined by a batch method was ab out 0.1 mmol g-1 (glass beads). The beads reacted with various metal i ons in several solutions of differing pH, and the degree to which the metal ions coordinated to the pyridazine derivative was indicated by a color change. Using a column method, metal ions were selectively reta ined, and then quantitatively and separately eluted from the beads by a stepwise elution employing several eluents, including hydrochloric a cid. A column packed with the beads was successfully used to determine trace metal ions in both tap- and rain-water samples.