Abstract: Detrmination of 15 Rare Earth Elements of Hair Certified Reference Material by Microwave Acid Digestion ICP-MSLiu Husheng;Wang Naifen;Wang Xiaoyan;Liu Ming;Zhang Jing(Public Health College,Beijing Medical University,Beijing 100083,China)Received Abstract:This paper describes the study on 15 ultra trace tare earth elements of hair certified reference material(CRM) by microwave acid digestion.A rapid and complete dissolution of the hair sample was achieved by using a microwave digestion procedure requiring only concentrated nitric acid and hydrogen peroxide.Fifteen ultra trace rare earth elements in hair CRM GBW07601 were determined by ICP-MS.The matrix inhibition effect was eliminated by the addition standard calibration curve.Detection limits for 15 rare earth elements are 0.007-0.026μg/L.Using soil CRM GBW07403 as quality control,the results obtained from this work are in good agreement with the certified values and reference values without separation and enrichment procedures.Keywords:microwave acid digestion,hair,CRM,ICP-MS,quality control,ultra trace REE