高分辨连续光源石墨炉原子吸收光谱法测定食品中铅、镉和铬含量

使用高分辨连续光源石墨炉原子吸收光谱法对谷类、蔬菜、饮品、海产品和乳制品五类共22种常见食品中的重金属元素铅、镉和铬进行了研究。建立了样品预处理、样品消解和定量分析的实验方法，得到了良好的分析精密度(RSD=1.3%～4.9%) 和回收率(95.1%～104.6%)。结果表明，茶叶中的铅和贝类中的铬含量远远大于其他食品，小米、韭菜和贝类中的镉含量较高。本研究为食品中重金属的检测建立了可靠的定量分析方法，为推动食品质量安全相关标准的制定提供了实验依据;同时，根据测定结果得出的食品中重金属含量的分布情况，对提高消费者的食品安全意识能够起到积极的引导作用。

Determination of Pb, Cd and Cr in Food by High Resolution Continuum Source Graphite Furnace Atomic Absorption Spectrometry

The contents of lead, cadmium and chromium were determined for 22 kinds of foods including cereals, vegetables, beverage, sea foods and dairy products by using high resolution continuum source graphite furnace atomic absorption spectrometry (HR-CS GFAAS). The methods for sample preparation, digestion, and quantitative analysis were established, by which satisfying analytical precision (RSD=1.3%～4.9%) and recovery (95.1%～104.6%) were achieved. The results indicated that the contents of lead in tea leaves and chromium in shellfish were much higher than those in the other foods; the contents of cadmium in millet, leek and shellfish were relatively higher than the others. This work established reliable methods for quantitative analysis of heavy metals in foods, which provided experimental references for the constitution of food quality and safety standards. Meanwhile, the distributions of heavy metals in foods given by this work can be expected to enhance the consumers’ consciousness of food safety.