A COMPARISON OF PRECONCENTRATION REAGENTS FOR FLOW-INJECTION ANALYSISFLAME ATOMIC SPECTROMETRY

A small range of new commercially available chelating resins are compa red with a resin prepared in-house in terms of their applicability for on-line preconcentration and matrix separation. The flow injection ma nifold was designed for rapid matrix separation and the resins were te sted for the determination of CuII, ZnII, CdII, MnII and NiII. The res in based on controlled pore glass was found to be better for this rapi d procedure because it did not require conditioning, although the poly mer based resins had better capacities. The commercially available con trolled pore glass based iminodiacetate (IDA) resin had a comparable p erformance to the in-house controlled pore glass 8-hydroxyquinoline (C PG-8-HQ) resin. The IDA resin had a much higher capacity than the 8-HQ , however as with all IDA based resins, some retention of Call was obs erved. The sample throughput was 12 h(-1).