Determination of Lead in Water of Parana River by Solid Phase Spectrophotometry

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

Chemia Analityczna

Polish Chemical Society and the Committee on Analytical Chemistry of Polish Academy of Sciences

Lugar: Warsaw; Año: 2007 vol. 52 p. 501 - 510

0009-2223

The present paper proposes a procedure for lead determination in water samples by solid phase spectrophotometry (SPS). It is based on the reaction of Pb(II) ion with 2-(5-Bromo-2-pyridylazo)-5-(diethylamino)phenol (5-Br-PADAP) immobilized over an anion-exchange resin, giving a coloured complex, and the subsequent absorbance measuring of coloured compound directly at the solid phase. The method provided a detection limit of 2.4 µg L-1 and a sample throughput of 2 h-1. The relative standard deviation (R.S.D.) was 1.7% for a Pb(II) concentration of 10.0 µg L-1. The calibration graph obtained was linear with a correlation coefficient of 0.9995, at levels near the detection limits up to at least 100 µg L-1. This method was successfully applied to the determination of Pb(II) in natural superficial waters from Parana River in Argentine.