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    不同消解方法对火焰原子吸收光谱法测定乳制品中无机元素含量的影响

    Effect of Different Methods of Sample Digestion on the FAAS Determination of Inoganic Elements in Dairy Products

    • 摘要: 取鲜奶及酸奶样品分别用3种不同的消解方法(即常规湿法酸消解法、微波加热酸消解法和干法消解法)做预处理。在所得最终的试样溶液中分别用火焰原子吸收光谱法测定其中6种无机元素(即钙、镁、铜、锌、铁及锰)。试验结果表明:采用微波加热酸消解法处理的样品,6种元素的回收率可达94.5%~100.0%高于其他两种方法的回收率最高值,相关测定值的相标准偏差(n=6)在1.9%~4.2%之间。因此,用火焰原子吸收光谱法测定乳制品中无机元素含量时,用微波加热酸消解法处理样品的效果较好。

       

      Abstract: Samples of fresh milk and yoghurt were pre-treated separately by 3 different methods of sample digestion, i.e., the conventional wet acid digestion, the microwave assisted acid digestion and the dry ashing method, and the final sample solutions were used for FAAS determination of 6 inorganic elements, i.e., Ca, Mg, Cu, Zn, Fe and Mn. As shown by the analytical results, the highest recovery of 94.5%-100.0% was obtained by the microwave assisted sample digestion method and values of RSD′s (n=6) obtained were in the range of 1.9%-4.2%. Hence, the microwave assisted digestion of samples of dairy products was preferred rather than the other 2 methods.

       

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