Determination of trace elements (Cu,Mn,Zn,Cd) in ginger by methods of microwave sample digestion and flame atomic absorption.

Purpose: This test is to analyze the sample,ginger by methods of Wet Digestion and Microwave Digestion,and to determine the content of the four trace elements,Cu and Zn,Cd,and Mn by the means of atomic absorption spectrometry.Method: After the single factor test of mixed acid system,mixed acid ratios,the solid-liquid ratio and digestive time,we are to determine the best single factor levels and carry out the orthogonal experiment in order to ascertain the best condition for wet digestion and microwave digestion adopting the atomic absorption spectrometry;and the next step is to determine the content of trace elements Mn,Cu and Zn,Cd,etc.Results: The best condition for microwave digestion of HNO3-H2O2,Cu is 2∶1,solid-liquid ratio 1∶12,best period for digestion is 14 mins;as for Mn,HNO3-HCl is 6∶1,solid-liquid scale is 1∶8,period for clearing up is 12 min;for Cd,HNO3-H2SO4 is 2∶1,solid-liquid scale is 1∶12,digestion period is 14 min;for Zn,HNO3-HCl is 2∶1,solid-liquid scale is 1∶12,period for clearing up is 12 min.Content of measured in ginger,Cu and Zn,Cd,Mn concentration is repectively 3.41,53.07,40.86,5.15 μg/g;the recovery rate is 95.26%～108.0%,accuracy is 0.2377%～1.258%.Conclusion: The sample can be digested byt the way of microwave digestion fast and easily,economically,and cleared up fully.