关键词: font-size:medium, ">ICP-MS；微波消解；谷精草；重金属及有害元素

Abstract: Objective：To establish a method for the determination of Pb，Cd， As，Hg and Cu residues in Eriocaulon buergerianum by inductively coupled plasma mass spectrometry (ICP-MS).Methods： After microwave digestion, germanium (72Ge)， indium (115In) and bismuth (209Bi) were used as internal standard to determine the residues of the above five elements by ICP-MS method. Results:The residual amounts of Pb， As， Cu and Hg and harmful elements in the samples determined by ICP-MS method were all lower than the conventional limits of heavy metals and harmful elements in plant traditional Chinese medicine. The residual amount of Cd was 0.43-1.10 mg·kg-1， with an average value of 0.78 mg·kg-1. Among them， Cd residues of 5 batches of samples exceeded 1.0 mg·kg-1， which exceeded the requirements of the standard，and existed serious security risks.The correlation coefficients of the standard curves of each element were 0.999 6-1.000 0， with precision RSD of 0.9%-2.2%， reproducibility RSD of 1.1%-2.3% and stability RSD of 1.0%-2.4%， showing good accuracy. Conclusion： The method is accurate and reliable， with little interference， high sensitivity and stable result， which is suitable for the determination of residual amounts of heavy metals and harmful elements in Eriocaulon buergerianum.

Key words: font-size:medium, ">ICP-MS；Microwave digestion；Eriocaulon buergerianum；Heavy metals and harmful elements