氢化物发生-原子荧光光度法测定食品添加剂氢氧化钠中的汞

Determination of mercury in sodium hydroxide by hydride generation-atomic florescence spectrophotometry

目的：探讨应用氢化物发生-原子荧光光度法测定食品添加剂中汞的含量。方法：样品被酸中和后，在一定酸度下，用溴将汞转化为二价汞，在最佳的实验条件下，直接用AFS2201原子荧光光度计进行测定。结果：该法在0～5．0μg/L线性范围内，回归方程为：Y=98．87X-3．29，相关系数为r=0．9999，方法的检出限为0．15ng／ml，样品加标回收率为90．7％～100．4％，RSD为1．88％～3．31％。结论：本法具有操作简单，灵敏度高，重现性好等优点，适合大批样品的分析检测。

Objective：To set up a method to determine mercury in sodium hydroxide by hydride generation - atomic florescence spectrophotometry. Methods：First, the sample should be neutralized, then turned the mercury into Hg^2＋ by bromine in the condition of certain acidity. After Hg^2＋ was deoxidized into free form by KBH4, determine it by atomic florescence spectrophotometry. Results ：The detection limit of the method was 0. 15 ng/ml. The relative standard deviation were 1.88% - 3. 31%. The recovery of the method were 90. 7% - 100. 4%. Conclusion：The method has high sensitivity, its precision and accuracy were both meet requirements.