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目的对使用氢化物发生-双道原子荧光光度计和DMA-80直接测汞仪测定奶粉中汞含量的2种方法进行比较,选择更加适合实验室分析的方法。方法采用国家标准方法,利用微波消解对奶粉进行样品前处理,之后通过氢化物发生-双道原子荧光光谱测定奶粉中汞的含量,同时采用DMA-80直接测汞仪直接对奶粉中的汞含量进行测定。结果对使用原子荧光光度计和DMA-80直接测汞仪测定奶粉中汞含量的2种不同方法的测定结果进行对比,数据一致性良好,线性范围满足实验要求,相关系数(r)均>0.999,原子荧光法回收率>90%,直接测汞仪回收率达到100%。原子荧光法的精密度为4.8%,直接测汞仪的精密度结果更好,为2.2%。2种方法的数据准确度均达到满意结果。结论 2种检测方法均能满足各种奶粉中汞含量的检测要求,DMA-80直接测汞仪在满足实验要求的前提下,线性范围更宽,所需样品量更少,更能节省时间、人力,适应现代分析工作的要求。
OBJECTIVE To compare the two methods for the determination of mercury in milk powder by hydride generation - dual channel atomic fluorescence spectrophotometer and DMA-80 direct mercury analyzer, and select a more suitable method for laboratory analysis. Methods The national standard method was used to sample the milk powder by microwave digestion. The content of mercury in milk powder was determined by hydride generation-two-channel atomic fluorescence spectrometry. The direct measurement of mercury content in milk powder by DMA-80 direct mercury analyzer Measurement was performed. Results The results of two different methods for the determination of mercury in milk powder by atomic fluorescence spectrophotometer and DMA-80 direct mercury analyzer were compared. The data were in good agreement and the linear range satisfied the experimental requirements. The correlation coefficients (r) were both> 0.999 , Atomic fluorescence recovery rate> 90%, direct mercury detector recovery rate of 100%. The precision of atomic fluorescence spectrometry was 4.8%, and the precision of direct mercury detector was better, which was 2.2%. The data accuracy of the two methods reached satisfactory results. Conclusion Both methods can meet the detection requirements of mercury in various milk powders. The DMA-80 direct mercury analyzer meets the experimental requirements with a wider linear range, less sample size, more time saving, Manpower, to adapt to the requirements of modern analytical work.