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目的建立高压罐消解、微波消解ICP-MS法测定粉条中铝的方法,并对2种前处理方法进行比较。方法高压罐消解、微波消解为前处理方法,以硝酸为消化液,利用ICP-MS分析,测定粉条中的铝含量。结果该方法线性范围在0 ng/ml~200 ng/ml之间,线性相关系数0.9998,检出限在0.72 mg/kg,2种前处理方法的精密度(RSD)在0.51%~1.9%之间,回收率在99%~102%之间。结论实验过程选择2个不同浓度的样本进行分析,结果表明2种前处理方法对于粉条中铝测定的精密度和准确度差异无统计学意义,均满足食品样本的测定需求。比较高压罐消解法和微波消解法,这2种方法都属于密闭高压体系,都使用硝酸一种试剂,均减少了环境及试剂对测定结果的影响。其中微波消解法在硝酸的使用量上少于高压消解法,对于批量处理样本时,可以节约成本,更有优势。
Objective To establish a method for the determination of aluminum in vermicelli by ICP-MS with high-pressure tank digestion and microwave digestion, and compare the two pre-treatment methods. Methods High-pressure tank digestion and microwave digestion were the pretreatment methods. The content of aluminum in vermicelli was determined by ICP-MS with nitric acid as digestive juice. Results The linear range of this method was between 0 ng / ml and 200 ng / ml with a linear correlation coefficient of 0.9998. The detection limit was 0.72 mg / kg. The RSDs of the two methods were between 0.51% and 1.9% Between the recovery rate of 99% ~ 102%. Conclusion Two different concentration samples were selected for the experiment. The results showed that there was no significant difference between the two pretreatment methods for the precision and accuracy of determination of aluminum in vermicelli, all of which satisfied the determination requirements of food samples. Comparison of high-pressure tank digestion and microwave digestion, these two methods belong to a closed high-pressure system, all use nitric acid, a reagent, have reduced the environment and reagents on the measurement results. Among them, the microwave digestion method uses less nitric acid than the high-pressure digestion method, which can save cost and have more advantages for batch processing samples.