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目的对石墨炉原子吸收法与分光光度法测定面制食品中铝进行比较。方法采用高氯酸—硝酸对食品进行前处理,分别用石墨炉原子吸收光谱法和铬天青S分光光度法对食品中铝进行检验。结果石墨炉原子吸收光谱法的线性范围在0.025~0.40 mg/L,使用新原理进行曲线拟合,标准各点均分布在曲线上,相关系数R达到0.999 6,面制品铝含量测定回收率为94.5%~102.7%,RSD1.07%;铬天青S分光光度法的线性范围在0.010~0.10 mg/L,相关系数R为0.997 3,面制品铝含量测定回收率为85.6%~115.7%,RSD3.58%。结论石墨炉原子吸收光谱法比铬天青S分光光度法测定面制品中铝的含量更加简单、快速和准确,回收率更高,值得推广使用。
OBJECTIVE To compare the determination of aluminum in flour food by graphite furnace atomic absorption spectrometry and spectrophotometry. Methods The food was pretreated with perchloric acid - nitric acid, and the contents of aluminum in food were tested by graphite furnace atomic absorption spectrometry and chrome azure S spectrophotometry respectively. Results The linear range of graphite furnace atomic absorption spectrometry was 0.025-0.40 mg / L. The curves were fitted by using the new principle. The standard points were all distributed on the curve with a correlation coefficient R of 0.999 6. The recovery of aluminum content in the pasta was 94.5% ~ 102.7%, RSD1.07%. The linear range of Chromazurol S spectrophotometry was 0.010 ~ 0.10 mg / L, the correlation coefficient R was 0.997 3, the recovery of aluminum content in the noodles was 85.6% ~ 115.7% RSD 3.58%. Conclusion Graphite furnace atomic absorption spectrometry is more simple, rapid and accurate for determination of aluminum in flour products than chromium azurol S spectrophotometry. Its recovery rate is higher and it is worth popularizing.