Chemical fractionation of Cadmium in natural water from Parana river at Corrientes-Argentine.

PELLERANO, R. G., ROMERO, C. H., ACEVEDO, H. A., VÁZQUEZ, F. A.

Journal of the Argentine Chemical Society

Asociación Química Argentina

Lugar: Buenos Aires; Año: 2007 vol. 95 p. 41 - 50

0365-0375

Parana river (Spanish Río Paraná), the second longest river in South America is a very important source of water in Argentina. The present paper proposes a technique that combines Solid Phase Extraction (SPE) with Solid Phase Spectrophotmetry (SPS) for cadmium fractionation in natural water. The concentrations of cadmium bound to humic substances and of free metal ions were determined of their sorption-elution on the chromatographic support resin (Silica C18). Cadmium determination is based on Solid Phase Spectrophotometry (SPS) with 1-(2-pyridylazo)-2-naphtol (PAN) sorbed on anionic resin. It was optimized using Response Surface Methodology (RSM) based on sequential experimental Doehlert design. Recoveries were guarantied for all samples studied. The detection limit (DL) was 1.0 mg L-1 for Cd(II). The precision for 10 replicate determinations at 10 mg L-1 cadmium levels was 3.2% relative standar deviation (RSD).