A solvent extraction-atomic absorption technique for the simultaneous determination of low concentrations of iron, nickel, chromium and manganese in drinking water.
A simple and rapid method has been developed for the extraction of Fe, Ni, Cr and Mn in drinking water samples with a new reagent, pentamethylene dithiocarbamate, into methyl isobutyl ketone (MIBK) and their subsequent determination by atomic-absorption spectrometry. The extraction has been carried out at a high aqueous: organic phase ratio to achieve a 35-fold preconcentration factor. Extraction parameters and interference factors are discussed. The precision based on replicate analyses is between 3 and 10% for a concentration range of 2-250 microg/l. of the four metals. The detection limits (3sigma) for Fe, Ni, Cr and Mn are 0.30, 0.36, 0.40 and 0.22 microg/l., respectively, corresponding to a metal concentration of 0.50 microg/l.
Babu
D R
DR
Department of Chemistry, Sri Venkateswara University, Tirupati 517502, India.
Naidu
P R
PR