Spectroscopy and Spectral Analysis, Volume. 33, Issue 8, 2211(2013)
Indirect Determination of Cr(Ⅲ) and Cr(Ⅵ) in Milks by Hydride Generation-Fluorescence Spectrometry
In the medium of 3 mol·L-1 hydrochloric acid, Cr(Ⅵ) oxidized As(Ⅲ) to be As(Ⅴ), the As(Ⅲ) content, which was left over, was determined by hydride generation-fluorescence spectrometry, giving that it was inversely proportional to Cr(Ⅵ) content. Based on the same principle and combined with potassium permanganate oxidation of Cr(Ⅲ) to be Cr(Ⅵ), the Cr(Ⅲ) was, therefore, determined. The sample digestion procedures and co-existing ions which might have interference were investigated. The instrumental operation parameters, reaction acidity and other influence factors were studied. Under optimum operation conditions, a good linear relationship was obtained in the range of 4.0~20 μg·L-1 Cr. The detection limit of the method was 2.5 μg·L-1. When the method was applied to milk analysis, a relative standard deviation(RSD, n=6) of 1.6%~2.7% was found. The recovery was 96.5%~104.2%.
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ZHANG Li-ying, TAN Fang-wei, LU Jian-ping, TANG Yan-kui. Indirect Determination of Cr(Ⅲ) and Cr(Ⅵ) in Milks by Hydride Generation-Fluorescence Spectrometry[J]. Spectroscopy and Spectral Analysis, 2013, 33(8): 2211
Received: Dec. 13, 2012
Accepted: --
Published Online: Aug. 12, 2013
The Author Email: Li-ying ZHANG (zhangli_ying@yahoo.com.cn)