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目的:通过研究食品安全风险监测中铝痕量分析的特点、建立有效和准确的石墨炉原子吸收光谱法测定食品中痕量铝的检测方法,为国标的修订奠定基础。方法:采用湿法消解、微波消解和压力罐消解法消解样品,在257.4 nm共振线,应用石墨炉原子吸收光谱法测定食品中痕量铝。结果:当称样量0.5 g,定容量25 ml时,本方法的定量限(LOQ):0.75 mg/kg,线性范围是:16μg/L～250μg/L,加标回收实验的回收率在92%～106%之间。用此方法测定了广东各地区部分食品中铝含量,其中茶叶、海带、海蜇、油炸食品和紫菜中铝含量较高,中位值分别为541 mg/kg、325 mg/kg、905 mg/kg、302 mg/kg和252 mg/kg。结论:该方法准确、可靠,灵敏度好,可满足食物本底水平中铝的风险监测以及国标修订要求。
OBJECTIVE: To establish an effective and accurate method for the determination of trace aluminum in food by graphite furnace atomic absorption spectrometry (FAAS) by studying the characteristics of aluminum trace analysis in food safety risk monitoring and lay the foundation for the revision of national standard. Methods: Samples were digested by wet digestion, microwave digestion and pressure digestion. The trace amounts of aluminum in food were determined by graphite furnace atomic absorption spectrometry at 257.4 nm resonance line. Results: The limit of quantification (LOQ) was 0.75 mg / kg when the sample volume was 0.5 g and the constant volume was 25 ml. The linear range was 16 μg / L ~ 250 μg / L. The recoveries of spiked samples were 92 % ~ 106% between. The contents of aluminum in some foods of Guangdong were determined by this method. Among them, the contents of aluminum in tea, kelp, jellyfish, fried food and seaweed were higher, the median values were 541 mg / kg, 325 mg / kg and 905 mg / kg, 302 mg / kg and 252 mg / kg. Conclusion: The method is accurate, reliable and sensitive. It can meet the risk monitoring of aluminum in food background and the requirements of national standard revision.