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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HNO_3–H_2O_2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0.02μg/L,定量限为0.06μg/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。
Objective To determine the mercury content in fishmeal of known concentration by microwave digestion hydride generation atomic fluorescence spectrometry. Methods HNO_3-H_2O_2 digestion system was used to digest the samples with microwave. The samples were washed with boiling water bath, with 0.05% potassium borohydride, 1.5% potassium hydroxide as reducing agent and 5% nitric acid solution as carrier. Under 20-30 ℃ environmental conditions Determination of Total Mercury in Fish Meal by Hydride Generation Atomic Fluorescence Spectrometry. Results The correlation coefficient R = 0.9999, the detection limit of 0.02μg / L, the limit of quantification of 0.06μg / L. Under appropriate environmental conditions, the relative standard deviation of determination results was 1.3% -2.8% with the method of microwave digestion and hydride generation atomic fluorescence spectrometry. Conclusion The method is simple, rapid, sensitive, less interference, and can be used for the total mercury content in the fish meal of known concentration.