【摘 要】
：
The contents of Cr(Ⅲ) and Cr(Ⅵ) in chromium-enriched foodstuffs were determined by graphite furnace atomic absorption spectrometry (GF-AAS), to make an accura
【机 构】
：
Tianjin Enter-Exit Inspection and Quarantine Bureau, Tianjin, P. R. China
【出 处】
：
2011食品安全技术与标准国际研讨会暨AOAC中国区年会
论文部分内容阅读
The contents of Cr(Ⅲ) and Cr(Ⅵ) in chromium-enriched foodstuffs were determined by graphite furnace atomic absorption spectrometry (GF-AAS), to make an accurate evaluation of the quality, including the nutrition and toxicity. Thenoyltrifluoracetonate (TTA) was used to form volatile complex with Cr(Ⅲ), separated from Cr(Ⅵ) as a vapor in the heated graphite furnace. The effects of sample digestion mode, pH, concentration of TTA, sonication time & temperature, and atomization conditions on the separation of Cr(Ⅲ) and Cr(Ⅵ) were investigated. The contents of both Cr(Ⅲ) and Cr(Ⅵ) in selected chromium-enriched foodstuffs were determined ,and the data indicated that the contents of Cr(Ⅵ) were all below its maximum contaminant level (MCL) available.
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