PRECONCENTRATION AND INDUCTIVELY COUPLED PLASMA ATOMIC EMISSION SPECTROMETRIC DETERMINATION OF METAL-IONS WITH ONLINE CHELATING ION-EXCHANGE

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 Antaretic 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 mu-g l-1 level and 5% for higher concentrations.