【摘要】 [目的]建立原子荧光光谱法同时测定食品中镉和汞的方法。[方法]以硝酸-过氧化氢作氧化剂,微波消解食品样品后,用原子荧光光谱法同时测定样品中的镉和汞。优化了食品样品处理和原子荧光光谱检测的实验条件,同时对共存干扰元素的影响和消除进行研究。[结果]在优化的条件下,镉、汞分别在0.2～4.0μg/L范围内呈良好的线性关系(相关系数为镉0.9999、汞0.9994)。该方法的检出限镉为0.007μg/L、汞为0.032μg/L,镉和汞的定量限分别为0.022μg/L和0.105μg/L。测定的相对标准偏差(RSD)镉为1.65%～4.8%、汞为1.0%～5.1%。加标回收率分别为镉97.0%～119.5%、汞88.5%～104.0%。[结论]该方法灵敏度高、准确性好,快速简便,适用于食品样品中镉和汞的同时测定。更多还原

【Abstract】 [Objective] To establish a rapid and sensitive method for simultaneous determination of cadmium and mercury in food samples by atomic fluorescence spectrometry. [Methods] Microwave-digestion technique with HNO3-H2O2 was applied for the pretreatment of samples. The sample pretreatment and instrumental operation parameters were optimized. The experimental reaction system and reaction conditions were optimized, respectively. The influence from co-existing foreign ions and the elimination were also studied. [Results] Under the optimized conditions, the linear range of the method was 0.2-4.0μg/L for cadmium and mercury with the correlation coefficients of 0.999 4 for cadmium and 0.999 9 for mercury. The detection limits of cadmium and mercury were 0.007μg/and 0.032μg/L, respectively. The quantification limits were 0.022μg/L for cadmium and 0.105μg/L for mercury. The RSD were in the range of 1.65%-4.8% for cadmium and 1.0%-5.1% for mercury. The spiked recoveries of the analytical method were 97.0%-119.5% for cadmium, and 88.5-104.0% for mercury. [Conclusion] The method is simple, rapid, accurate and sensitive. It can be adopted for simultaneous determination of cadmium and mercury in food samples.更多还原