Abstract：The zinc smelting industry is an important source of mercury pollution in air. The regenerated zinc raw material is one of important sources of zinc. Therefore, the accurate determination of mercury in regenerated zinc is of great significance. In this study, 10 mL of hydrochloric acid was firstly added to removal sulfur by heating. Then, 5 mL of nitric acid was added to dissolve the sample. The mercury in regenerated zinc raw material with mass fraction in range of 0.000 1%-0.060% was determined by atomic fluorescence spectrometry using hydrochloric acid (1+19) as carrier and using potassium borohydride solution as reducing agent. In experiments, 0.5 g/L potassium dichromate-5% nitric acid was used as protective agent of mercury to store the standard solution for long time. Under the selected working conditions, the mass concentration of mercury in range of 2-20 ng/mL showed linear relationship with correlation coefficient of R2=0.999 6. The detection limit of method was 0.20 ng/mL, and the lower determination limit was 2.0 ng/mL. The interference tests indicated that the coexisting elements in sample did not interfere with the determination of mercury. Several actual samples such as zinc-bearing waste material, gas dust, zinc oxide, zinc ash and dross were determined according to the experimental method. The found results were basically consistent with those obtained by cold atomic absorption spectrometry. The relative standard deviations (RSD, n=6) were between 1.6% and 3.5%. The proposed method had been applied to the determination of mercury in gas dust and zinc-bearing waste material. The recoveries were between 96% and 101%.
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WANG Jin. Determination of mercury in regenerated zinc raw material by hydride generation atomic fluorescence spectrometry. , 2016, 36(5): 35-38.
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