Simultaneous determination of arsenic and mercury in lead ingot by polyepoxysuccinic acid masking matrix-hydride generation atomic fluorescence spectrometry
WANG Li1, LU Jian-ping*1, ZHANG Yun-fei2
1.College of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China; 2. Nanning Feili Battery Jar and Electrical Appliance Co., Ltd., Nanning 530409, China
Abstract：A simple method for simultaneous determination of As and Hg in lead ingot was developed based on hydride generation atomic fluorescence spectrometry (HG-AFS) with nitric acid dissolving samples and polyepoxysuccinic acid (PESA) masking matrix. The influences of sample dissolution method and PESA dosage on the determination results were investigated. The hydride generation conditions and instrumental operation parameters were optimized. The possible interference of coexisting elements was discussed. The results showed that 2.0 mL of PESA could effectively mask Pb matrix after dissolving 0.1 g of lead ingot. The coexisting elements in lead ingot including Ca, Cu, Sb and Sn did not interfere with the determination of As and Hg. The detection limits were 0.070 μg/L for As and 0.011 μg/L for Hg, respectively. The proposed method has been applied to the determination of actual samples. The relative standard deviations (RSD, n=5) for As and Hg were 1.0%-2.0% and 1.3%-1.9%, respectively, and the recoveries were 96%-102% and 99%-103%, respectively.
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WANG Li, LU Jian-ping*, ZHANG Yun-fei. Simultaneous determination of arsenic and mercury in lead ingot by polyepoxysuccinic acid masking matrix-hydride generation atomic fluorescence spectrometry. , 2011, 31(9): 34-37.
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