Direct determination of mercury in zinc concentrate by solid sampling
LUO Ming-gui1, XIE Yu-qun1, LI Tong-yao2, LI Xiang-rong1
1. Comprehensive Technical Service Center of Fangcheng Customs, Fangchenggang 538001, China; 2. China Inspection and Certification Group Guangxi Co., Ltd., Nanning 530022, China
Abstract：During the determination of mercury in zinc concentrate by acid dissolution-atomic fluorescence spectrometry in national standard method (GB/T 8151.15-2005), an open acid digestion system was used for the pretreatment of samples. Then the content of mercury was determined by atomic fluorescence spectrometry. The analysis process of this method was long, which could not meet the demand of rapid inspection of imported zinc concentrate at the port. A rapid method for the determination of mercury in zinc concentrate by solid sampling-direct mercury analyzer was established in experiments without pretreatment of samples. The conditions were obtained through orthogonal experimental method: the decomposition time of sample was 330s; the decomposition temperature was 800℃; the sample mass was 0.050-0.10g; the determination range was 0.50-150μg/g. The linearity of calibration curve in range of 50-15000ng was good with linear correlation coefficient of 1.0000. The limit of quantification was 0.44μg/g. The content of mercury in zinc concentrate sample was determined according to the experimental method. The relative standard deviations (RSD, n=11) of determination results were between 2.8% and 5.4%. The determination results had no significant difference with those obtained by current national standard method (GB/T 8151.15-2005).
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LUO Ming-gui, XIE Yu-qun, LI Tong-yao, LI Xiang-rong. Direct determination of mercury in zinc concentrate by solid sampling. , 2020, 40(9): 57-62.
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