ICP-AES Determination of Micro Amounts of Cu,Zn,Co and Mn in Chinese Herbal Medicines with Micro-wave Assisted Sample Digestion

Four inorganic elements (i.e.Cu,Zn,Co and Mn) in 5 different Chinese herbal medicines,i.e.,mother chrysanthemum,chrysanthemum,dandelion,eriobotrya japonica and cicada slough,by ICP-AES was described in this paper.Samples were digested with HNO3 and H2O2 and heated in microwave digestion oven.Precision and recovery were tested on the base of a sample of mother chrysanthemum,and values of recovery ranged from 96.0% to 106.5% were obtained,while values of RSD′s (n=6) found were less than 2%.Values of detection limit (3S/N) for Cu,Zn,Co and Mn found were 0.011,0.018,0.001 1 and 0.024 mg·L-1 respectively.