GF-AAS Determination of Lead,Cadmium and Cobalt in Daily Necessities

Samples of daily necessities were digested in PTFE vessel with HNO3 and H2O2,and heated in WP 200 LG microwave oven under prescribed program.Ammonium molybdate and diammonium hydrogen phosphate solutions were added as matrix modifiers to the sample solution obtained.Under the optimized experimental conditions,linear relationships between values of absorbance and mass concentration of the 3 elements were obtained in the ranges within 100 μg·L-1 for lead,within 50 μg·L-1 for cadmium and within 20 μg·L-1 for cobalt.Values of detection limit (3S/N) obtained were 6.25,0.50 and 0.65 μg·L-1 respectively.Tests for recovery were made for the 3 elements by standard addition method using 5 different kinds of samples as matrix,giving results of recovery in the ranges of 80%-130%,80%-110% and 92%-112% respectively.