微波消解氢化物原子荧光法测定已知浓度海鱼粉中总汞的含量

Determination of known concentration of total mercury content in sea fish meal by microwave digestion and hydride atomic fluorescence spectrometry

中文关键词:  微波消解  氢化物原子荧光法  海鱼粉  总汞

英文关键词:microwave digestion  hydride atomic fluorescence spectrometry  sea fish meal  total mercury

中文摘要:

      目的 采用微波消解氢化物发生原子荧光法测定已知浓度海鱼粉中的汞含量。方法 采用HNO3–H2O2消解体系, 利用微波消解样品, 用沸水浴赶酸, 以0.05%硼氢化钾、1.5%氢氧化钾为还原剂, 5%硝酸溶液为载流, 在20~30 ℃环境条件下用氢化物发生原子荧光法测定海鱼粉中的总汞。结果 方法的相关系数R=0.9999, 检出限为0.02 μg/L, 定量限为0.06 μg/L。在适合的环境条件下, 以微波消解氢化物原子荧光法测定海鱼粉中的汞, 测定结果的相对标准偏差为1.3%~2.8%。结论 本方法简便、快速、灵敏度高、干扰少, 能够用于已知浓度海鱼粉中总汞的含量。

英文摘要:

      Objective To determine the content of mercury in sea fish meal by microwave digestion and hydride atomic fluorescence spectrometry. Methods Microwave digestion samples were used with HNO3-H2O2 digestion system. Boiling water bath was used to cast acid. Under the condition of 20~30 ℃, hydride atomic fluorescence spectrometry was used to detect total mercury in sea fish meal with 0.05% potassium borohydride, and 1.5% potassium hydroxide as reductant, 5% nitric acid solution for load flow. Results The correlation coefficient of the method was 0.9999, and the limit of detection was 0.02 μg/L, the limit of quantification was 0.06 μg/L. The relative standard deviation of was determined Using microwave digestion and hydride atomic fluorescence spectrometry for determination of mercury in sea fish meal under appropriate environmental conditions, the relative standard deviations of the measurement results were 1.3%~2.8%. Conclusion This method is simple, rapid, sensitive and less disturbing, which can be used for the determination of total mercury content in sea fish meal.