ELIMINATION OF SODIUM INTERFERENCE IN PHOTOMETRIC DETERMINATION OF LEAD IN FLAMELESS ATOMIC ABSORPTION SPECTROPOTABLE WATER BY MATRIX MODIFICATION

Abstract

A flameless atomic absorption spectro photometric method which provides a useful, rapid, direct,accurate and precise determination of lead in water and uses matrix modifying reagent consisting of ammonium nitrate and ammonium dihydrogen phosphate is reported. The interference due to sodium salt is minimized by the presence of ammonium ions. Presenee of phosphate helps in charring of samples at higher temperatures without the loss of lead. Sample treatment is minimum and preconcentration is not required which reduces the time of analysis and risk of contamination. The minimum detection limit of the method is 1 MUg pb per litre.