食品中砷和汞的微波消解——原子荧光光谱测定法

目的建立微波消解原子荧光法同时测定食品中砷和汞的方法。方法采用微波消解处理样品。原子荧光法测定，并进行消解条件、精密度、回收率等试验。结果砷的检出限为0．50μg／L，汞的检出限为0．04μg／L。砷在0～100μg／L相关系数为0．9996；汞在0—50μg/L相关系数为0．9995；砷和汞的回收率，其范围分别为砷98．4％～104．1％，汞97．O％一104．3％。结论微波密闭消解样品，消化过程节约试剂，防止试样中待测元素的损失，干扰少，适用于食品中砷和汞的测定。

Determination of Arsenic and Mercury in Foods by Microwave Digestion-Atomic Fluorescence Spectrometry

Objective] To establish a method for determination of arsenic and mercury in foods by microwave digestion - atomic fluorescence spectrometry simultaneously. Methods ] The samples were treated by microwave digestion and determined by atomic fluorescence spectrometry. The parameters of digestion, the precision of the method and the recovery rate were investigated. Results ] The detection limit of arsenic and mercury was 0.50 μg/L and 0.04 μg/L, respectively. The correlation coefficient of arsenic was 0.9996 in the range of 0 ~ 100μg,/L, and the correlation coefficient of mercury was 0.9995 in the range of 0 ~ 50 μg/L. The recovery rate of arsenic and mercury was 98.4% ~ 104.1% and 97.0% ~ 104.3%, respectively. Conclusion] The microwave obturation digestion is suitable for determination of arsenic and mercury in foods, which has the advantages of reagent-saving, reducing losses of arsenic or mercury and little interference.