FAAS DETERMINATION OF HEAVY METAL IONS IN GROUND WATER AFTER PRECONCENTRATION BY ION-EXCHANGE

Heavy metal ions, including Cu~(2+) Co~(2+) Ni~(2+) Cd~(2+) Zn~(2+) Fe~(3+) Mn~(2+) Bi~(3+) Sb(Ⅲ,Ⅴ) and Pb~(2+), were preconcentrated on an ion-exchange column filled with 30ml of 732~# strong acidic cation exchange resin from a sample solution of pH 6. Flow-rate of sample solution during the adsorption process was 4.0ml·min~(-1). Above mentioned ions was then eluted from the resin with 70ml of 2.4mol·L~(-1) HCl at a flow-rate of 1.0ml·min~(-1). The eluant was diluted to 100ml in a volumetric flask, and the metal ions were determined by FAAS. Working conditions of instrument were described in detail. Recoveries obtained by standard addition method were in the range from 972% to 103.5%.