Preconcentration and inductively coupled plasma atomic emission spectrometric determination of metal ions with on-line chelating ion exchange

Abstract

An on-line preconcentration method utilizing a microcolumn of XAD-2 resin functionalized with 1-(2-thiazolylazo)-2-naphthol has been developed. Preconcentration factors of 125 were easily obtained for injection times of 5 min. The detection limit ranged between 2 ng l^–1 for Mn and 40 ng l^–1 for Ni. The resin has been used to preconcentrate Cd, Cu, Fe, Mn, Ni and Zn from river water and Antarctic sea-water (Ross Bay) prior to their determination by inductively coupled plasma atomic emission spectrometry. The precision of the technique is around 10% relative standard deviation at concentrations below the µg l^–1 level and 5% for higher concentrations.