Preparation of Open Tubular Solid-Phase Extraction Column with 5-Amino-8-hydroxyquinoline-modified Gold Nanoparticle Phase for the Enrichment of Heavy Metal Ions

Abstract

A 5-amino-8-hydroxyquinoline (AHQ)-modified gold nanoparticle (GNP) layer was fabricated on an inner wall of a silica capillary column by alternatively passing a citrate-stabilized GNP solution and an AHQ solution in a repeating fashion. The observations by a field emission scanning electron microscope showed that the thickness of the resulting GNP layer was about 0.15 µm. This column was then used as an open tubular solid-phase extraction column for cadmium, followed by electrothermal atomic absorption spectrometric determination. The detection limit of 0.009 ng ml^-1 was obtained.