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淀粉及其制品中铅含量测定及方法比较

Lead Contents Determination in Starch and Its Products and the Methods Comparison

  • 摘要: 为探究不同前处理、检测方法对淀粉及其制品中铅含量测定结果的影响,选取淀粉和淀粉制品样品,分别经湿法消解和微波消解处理后,采用国家标准中石墨炉原子吸收光谱法(GFAAS)、电感耦合等离子体质谱法(ICP-MS)和火焰原子吸收光谱法(FAAS)测定铅含量,从方法的回收率、精密度、经济性等方面评估不同前处理、检测方法的推广使用价值。结果表明:两种前处理方法回收率均较好,微波消解法比湿法消解精密度更好;ICP-MS测定的铅含量值显著高于GFAAS(P<0.05),ICP-MS的精密度、回收率较GFAAS更优,样品中的铅含量低于FAAS的检测限,均无法测定;各种淀粉制品中的铅含量普遍高于淀粉。除FFAS外,两种检测方法以及两种前处理方法均符合此类样品的检测要求,可根据精密度要求、实验室条件等选择最佳前处理和检测方法。

     

    Abstract: In order to explore the influences of different pretreatments and detection methods on the determination results of lead contents in starch and its products, the starch and starch products were selected as samples and treated by wet digestion and microwave digestion, then the lead contents were determined by graphite furnace atomic absorption spectrometry(GFAAS), inductively coupled plasma mass spectrometry(ICP-MS) and flame atomic absorption spectrometry(FAAS) in national standard, and the application values of different pretreatments and detection methods were evaluated from the recovery rates, precision and economy of the methods. The results showed that the recovery rates of two pretreatments were better, and the precision of microwave digestion was higher than that of wet digestion. The lead contents determined by ICP-MS was significantly higher than that by GFAAS(P<0.05), and the precision and recovery rate of ICP-MS were better than that of GFAAS, and the lead contents in samples were lower than the detection limit of FAAS, so it could not be determined. The lead contents in all kinds of starch products were generally higher than that in starch. Except FFAS, the two detection methods and the two pretreatment methods all met the detection requirements of this kind of samples, and the best pretreatment and detection methods could be selected according to precision requirements and laboratory conditions.

     

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