Citation: NI Zhanglin, TANG Fubin, QU Minghua, MO Runhong. Determination of trivalent chromium and hexavalent chromium in dried edible fungi by microwave ashing-liquid chromatography with inductively coupled plasma mass spectrometry[J]. Chinese Journal of Chromatography, ;2014, 32(2): 174-178. doi: 10.3724/SP.J.1123.2013.09047 shu

Determination of trivalent chromium and hexavalent chromium in dried edible fungi by microwave ashing-liquid chromatography with inductively coupled plasma mass spectrometry

1.
Research Institute of Subtropical Forestry, Chinese Academy of Forestry; Quality Testing Center for None-wood Forest Products of State Forestry Administration (Hangzhou), Fuyang 311400, China

Corresponding author: TANG Fubin,
Received Date: 29 September 2013
Available Online: 27 November 2013
Fund Project: 国家林业公益性行业科研专项课题(201304705,201204414). (201304705,201204414)

An analytical method using liquid chromatography with inductively coupled plasma mass spectrometry (LC-ICP-MS) for the determination of trivalent chromium (Cr(Ⅲ)) and hexavalent chromium (Cr(Ⅵ)) in dried edible fungi was established. Edible fungi sample was ashed by a microwave ashing system and Na₂EDTA was added to the ashing sample to stabilize the Cr(Ⅲ). An anion exchange column (250 mm×4.6 mm, 10 μm) with a 60 mmol/L nitric acid (pH 9.3) solution as mobile phase was used for the separation and using ICP-MS as a detector for the determination of trivalent chromium and hexavalent chromium. The calibration curves were linear in the range of 0.5-50 μg/L and the correlation coefficients were 0.9999 for Cr(Ⅲ) and Cr(Ⅵ). The average recoveries of Cr(Ⅲ) and Cr(Ⅵ) ranged from 78.0% to 90.7% with the relative standard deviations (RSDs, n=6) less than 4%. The limits of quantification (LOQ) of Cr(Ⅲ) and Cr(Ⅵ) were 0.5 μg/L. The method is efficient, reliable and sensitive, and can meet the requirement for the determination of Cr(Ⅲ) and Cr(Ⅵ) in dried edible fungi.
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沈阳化工大学材料科学与工程学院沈阳 110142