Determination of Cr(Ⅲ) and Ultratrace Cr(Ⅵ) in Toy Materials by Co-precipitation Assisted Separation-Ion Chromatography-Inductively Coupled Plasma Mass Spectrometry
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Determination of Cr(Ⅲ) and Ultratrace Cr(Ⅵ) in Toy Materials by Co-precipitation Assisted Separation-Ion Chromatography-Inductively Coupled Plasma Mass Spectrometry
Vol. 34, Issue 6, Pages: 706-710(2015)
作者机构:
1. 广东检验检疫技术中心
2. 广州杰信检验技术服务有限公司
3. 华南理工大学化学与化工学院
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Determination of Cr(Ⅲ) and Ultratrace Cr(Ⅵ) in Toy Materials by Co-precipitation Assisted Separation-Ion Chromatography-Inductively Coupled Plasma Mass Spectrometry. [J]. 34(6):706-710(2015)
DOI:
Determination of Cr(Ⅲ) and Ultratrace Cr(Ⅵ) in Toy Materials by Co-precipitation Assisted Separation-Ion Chromatography-Inductively Coupled Plasma Mass Spectrometry. [J]. 34(6):706-710(2015)DOI:
Determination of Cr(Ⅲ) and Ultratrace Cr(Ⅵ) in Toy Materials by Co-precipitation Assisted Separation-Ion Chromatography-Inductively Coupled Plasma Mass Spectrometry
The sample was extracted with 007 mol/L hydrochloric acid.Migratable chromium in the extract was determined by inductively coupled plasma mass spectrometry(ICP-MS).Some other extract was taken and the high content of interferential positive ions was removed by co-precipitation method with aluminium nitrate.Then Cr(Ⅵ) in the extract was determined by ion chromatography-inductively coupled plasma mass spectrometry(IC-ICP-MS).Cr(Ⅲ) content was obtained by minusing Cr(Ⅵ) content from the total migratable chromium content (Cr(Total)).The method quantitation limit for Cr(Total) and Cr(Ⅵ) reached to 0.01 mg/kg and 0.003 mg/kg,respectively.The method was then validated by conducting standard-addition experiments to the difference categories of toy materials according to Toy Safety Directive 2009/48/EC.The recoveries of Cr(Total) and Cr(Ⅵ) from the standard-addition experiments were in the ranges of 90.2%-101.5% and 96.7%-1067%,respectively, and the inter laboratory relative standard deviations were less than 7.4% and 7.9%,respectively.Therefore,the method was concluded to be accurate and reliable,which could satisfy the requirements of Cr(Ⅲ) and Cr(Ⅵ) in 3 categories of toy materials of Toy Safety Directive.