Comparison of three digestion methods for determination of lead and cadmium in milk and dairy products

Background: Toxic metals enter the human food chain through water, soil, and plants. High consumption of dairy products makes it necessary to measure their concentrations in milk its products. Methods: In this study, four samples products, including milk, dough, yogurt, cream were selected. They spiked with 0, 20, 40, 60 μg/kg lead (Pb) cadmium (Cd) separately. all samples, concentration these was determined using graphite furnace atomic absorption spectroscopy (GFAAS) after microwave, wet, dry ashing digestion methods. To select best method, recovery percentage, linearity increasing concentrations, relative standard deviation (RSD), limit detection used. Results: According results, RSD measurements less than 5%. The instrument for Pb Cd 0.188 0.157 μg/L, respectively. efficiency digested by three methods between 75.7% 120%. index R2 , microwave method 90 110% Pb-spiked Cd-spiked samples. Conclusion: Considering indexes,