HG-ICP-AES Determination of Trace Amount of Lead in Traditional Chinese Herbal Medicine Rhodiola Crenulata with Microwave Assisted Sample Digestion

HG-ICP-AES was applied to the determination of content of lead in rhodiola crenulata.The sample was treated by microwave assisted digestion and cetyltrimethylammonium bromide (CTAB) was used as sensitizing agent.Influential factors,including the conditions of microwave digestion,working parameter of the instrument,amount of potassium borohydride reguired for the hydride generation,and interferences of coexisting ions were studied.Under the optimized conditions,linearity range was kept from 0.27 to 700.0 μg·L-1,with value of detection limit (3σ) of 0.27 μg·L-1 and RSD (n=12) of 1.01%.The proposed method was applied to the analysis of the sample of rhodiola crenulata,giving values of recovery in the range of 98.8%-100.2%.