Determination of Heavy Metals and Harmful Elements in Medicine Food Homologous Food by ICP-MS

A method for the determination of heavy metals and harmful elements in medicine food homologous food was established,so as to provide for risk evaluation,standard improvement and quality supervision for the related food. The contents of lead,cadmium,arsenic,mercury and copper in medicine food homologous food were determined by inductively coupled plasma mass spectrometry(ICP-MS). The results showed that the linear relationship of five heavy metal elements was good(r>0.9953),the recovery rate ranged from 82.25% to 115.13%,and the repeatability was also good. The established method was applicable for determining the amount of heavy metals and harmful elements of medicine food homologous food. According to limits of heavy metals and harmful elements for medicine food homologous food such as leech in Chinese Pharmacopoeia,the qualified rate of heavy metals and harmful elements in 17 kinds of 73 batches of medicine food homologous food was 98.90%. Among them,the cadmium exceeded the standard,and the qualified rate was 94.52%. The ICP-MS method used in this paper was suitable for simultaneous determination of many elements in medicine food homologous food. The experiment showed that the contamination of individual elements in a few species was serious. It was recommended to take control of this aspect and improved relevant detection methods and limit standards.