石墨炉原子吸收法测定食品安全风险监测中痕量铝

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。

Determination of trace aluminium by GFASS in food safety risk monitoring

Objective: Through research on features of Aluminum trace analysis in food safety risk monitoring,an effective and accurate GFASS method for determination of trace Aluminum in food was developed to lay the foundation for GB code′s revision.Methods: By wet digestion,microwave digestion and tank pressure digestion for pre-treatment, trace aluminum in food was determined by GFASS in 257.4 nm resonance line.Results: When the sample weight 0.5 g,given 25 mL capacity,the limit of quantification(LOQ)was 0.75 mg/kg,the linear range was: 16 μg/L~250 μg/L,the rates of recoveries were 92%～106%. Aluminum content was determined in some foods of Guangdong,it was found high level in tea leaf,kelp,jellyfish,fried food and laver,and the median were 541 mg/kg,325 mg/kg,905 mg/kg,302 mg/kg and 252 mg/kg.Conclusion: The method is accurate,reliable,sensitive,which can meet the requirements in food risk monitoring in the background levels of Aluminum and requirements of revised national standard.