Citation: CHEN Dong, WANG Xiao-Wei, ZHAO Rong, SHAO Bin, WANG Zheng, WU Guo-Hua, XUE Ying. Simultaneous Determination of Trivalent Chromium and Hexavalent Chromium in Duplicate Diet by HPLC-ICP-MS[J]. Chinese Journal of Analytical Chemistry, ;2015, 43(12): 1901-1905. doi: 10.11895/j.issn.0253-3820.150703 shu

Simultaneous Determination of Trivalent Chromium and Hexavalent Chromium in Duplicate Diet by HPLC-ICP-MS

1.
Beijing Center for Preventive Medical Research, Beijing 100013, China

Corresponding author: CHEN Dong,
Received Date: 4 September 2015
Available Online: 14 October 2015
Fund Project: 本文系2014年度首都卫生发展科研专项基金资助项目(No.首发2014-4-1014) (No.首发2014-4-1014)

A method was developed for the determination of different valence states of chromium in duplicate diets. Samples were dried with freeze drying machine, then added to the microwave tube with 5% tetrabutyl ammonium hydroxide solution and digested for 30 min at 120℃. Finally, the extracts were made up to 25 mL, then centrifugated. The supernatant liquor was collected and filtered for further analysis by HPLC-ICP-MS. The linearity range was 0.5-50μg/L, and the correlation coefficients were above 0.999. The limits of detection of Cr(Ⅲ) and Cr(Ⅵ)(S/N=3) were 0.32, 0.35μg/kg and the limits of quantitative(S/N=10) were 1.00μg/kg. The recoveries were 80.7%-90.3% at spiked level between 20μg/kg and 200μg/kg with relative standard deviations under 5%. The proposed method was successfully used to detect Cr(Ⅲ) and Cr(Ⅵ) in 60 duplicate diets. The concentrations of Cr(Ⅲ) were 9.22-139μg/kg and the concentrations of Cr(Ⅵ) were 8.74-182μg/kg with average concentrations of 36.8μg/kg and 43.6μg/kg, respectively.
- High performance liquid chromatography-inductively coupled plasma-mass spectrometry,
- Microwave digestion,
- Food,
- Chromium,
- Valence state
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