食品中铝含量国标测定法的改进
目的 通过优化微波消解试剂和微波消解条件, 解决国标推荐方法对生物样品消解不彻底的问题, 使其能够准确测定食品中铝含量。方法 采用国标推荐的微波消解方法和优化后的微波消解方法进行样品的前处理, 消解河南小麦、芹菜、猪肝、大虾和粉丝粉条等标准参考物质, 采用电感耦合等离子体发射光谱法测定铝含量。结果 采用国标推荐的微波消解前处理方法, 试样测定结果远低于参考值。采用优化的微波消解程序 (硝酸－氢氟酸体系), 标准参考物质的铝含量测定结果较为接近标准参考值。铝含量在0~10.0 μg/mL范围内线性关系良好(r=0.9998), 标准参考物质中铝含量的回收率为71.9%~110%, 相对标准偏差为1.3%~6.3%。 结论 硝酸－氢氟酸体系与优化的微波消解程序方法能将样品消解更为彻底, 使检测结果更加准确, 该法可用于食品中铝含量的测定。
Objective To solve the problem of incomplete digested of biological samples, by optimizing the reagent and the conditions of microwave digestion, making the aluminum content in food accurately determined. Methods Using the microwave digestion method recommended by the national standard and the optimized microwave digestion method to pre-treat the sample, the standard reference materials such as Henan wheat, celery, pig liver, prawns and vermicelli noodles were digested, then the aluminum contents were determined by inductively coupled plasma optical emission spectrometry. Results The microwave digestion pretreatment method recommended by the national standard was adopted, and the sample measurement results were far below the reference values. Using an optimized microwave digestion procedure (nitric acid-hydrofluoric acid system), the aluminum content of the standard reference material was closer to the standard reference value. Aluminum content had good linear relationship within 0?10.0 μg/mL (r=0.9998), and the recovery rates of aluminum content in standard reference materials were in the range of 71.9%?110%, and the relative standard deviations were 1.3%?6.3%. Conclusion The nitric acid-hydrofluoric acid system and the optimized microwave digestion procedure can make the sample digestion more thorough and make the detection result more accurate. The method can be used to determine the aluminum content in food.
标题：食品中铝含量国标测定法的改进
英文标题：Improvement of national standard method for determination of aluminum in food
作者：
刘越 西安市食品药品检验所
李尔春 西安市食品药品检验所
张潇 西安市食品药品检验所
党欣 西安市食品药品检验所
贾兵 西安市食品药品检验所
张亚锋 西安市食品药品检验所
中文关键词:铝,食品,微波消解,国标,电感耦合等离子体发射光谱法,
英文关键词:aluminum,food,microwave digestion,national standard,inductively coupled plasma optical emission spectrometry,
发表日期：2019-04-03
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