Abstract
Poly(chlorotrifluoroethylene) resin (PCTFE) was found to adsorb some metal complexes, such as the complexes of Cd(II), Cu(II), Fe(III), Mn(II), Ni(II), and Zn(II) with 8-quinolinol and of Ag(I), Cd(II) and Cu(II) with Bismuthiol II (Bis II), and ion-associate complexes of Cd(II), Cu(II) and Zn(II) with 8-quinolinol-5-sulfonic acid (SOx) with tetrabutylammonium cation (TBA+). The retention capacities of the resin for the Ox and Bis II complexes were greater than those of the ion-associate complexes with SOx. By a column method using 1.0g of the resin, Cu(II), Fe(III) and Ni(II) were quantitatively concentrated as their Ox-complexes at pH 8 and a flow rate of 100ml min-1, and Ag(I) and Cu(II) complexes with Bis II at pH 2 and a flow rate of 220ml min-1. The metal-Ox complexes were easily eluted with methanol, the SOx complexes with 0.1% tetrabutylammonium chloride (TBAC)-methanol solution, and the Bis II complexes with a 0.1% TBAC-acetone solution. A direct introduction of these organic eluates to a nebulizer of atomic absorption spectrometer improved the measurement sensitivity. The proposed method was applied to an analysis of trace metals in a tap-water sample.
