Effect of Different Methods of Sample Digestion on the FAAS Determination of Inoganic Elements in Dairy Products

Samples of fresh milk and yoghurt were pre-treated separately by 3 different methods of sample digestion,i.e.,the conventional wet acid digestion,the microwave assisted acid digestion and the dry ashing method,and the final sample solutions were used for FAAS determination of 6 inorganic elements,i.e.,Ca,Mg, Cu,Zn,Fe and Mn.As shown by the analytical results,the highest recovery of 94.5%—100.0%was obtained by the microwave assisted sample digestion method and values of RSD s(n = 6) obtained were in the range of 1.9%—4.2%.Hence,the microwave assisted digestion of samples of dairy products was preferred rather than the other 2 methods.