Solid phase extraction of trace amounts of lead derivatized with 8-hydroxyquinoline using a GC stationary phase mini-column packed with chromosorb 105

Abstract

In this study, the commercially available GC stationary phase Chromosorb 105 was studied for preconcentration of Pb2+. The experiments showed that the trace amounts of Pb2+ found in tap water, river water, and bottled natural mineral water samples react with 8-hydroxyquinoline to form a complex at pH 8.0, and can be retained on a mini-column packed with Chromosorb 105, then eluted with 2.0 mL of 0.2 mol L-1 HNO3. The conditions for the quantitative and reproducible preconcentration, elution, and subsequent GFAAS determination were studied. A quantitative recovery (above 95%) for Pb2+ from 200 mL of tap water, river water, and bottled natural mineral water samples with a sensitivity enhancement of 100 was obtained. In this study, a highly sensitive, simple methodology for the preconcentration and GFAAS determination of trace amounts of lead in natural water samples was established, resulting in a detection limit of 39 ng L-1 (3 sigma).