Application of modified chemical sequential extraction-inductively coupled plasma mass spectrometry to determination of chemical speciation of copper,lead,zinc,cadinum and nickel in lead and zinc tailings
SHI Yi-hua,YANG Zhao-hong,XU hua,GU Xing-qian,QIU Li,TANG Bi-yu
Testing Center,China Nonferrous MetalGuilin Geology and Amining Co.,Ltd.,Guilin 541004,China
Four chemical forms (i.e., exchangeable form(F1), reducible form(F2), oxidable form(F3) and residual form(F4)) of heavy metal elements including copper, lead, zinc, cadmium and nickel in lead-zinc tailings were extracted by modified chemical sequential extraction (BCR) method. Then, the total amount and the content of each speciation of copper, lead, zinc, cadmium and nickel in lead-zinc tailings were determined by inductively coupled plasma mass spectrometry (ICP-MS). The results showed that the detection limits of method for each speciation of these four elements were between 0.012 mg/kg and 0.85 mg/kg, and the corresponding relative standard deviations (RSD, n=5) were between 2.1% and 9.9%. The ratios of the content sum of all speciations to the total measured value for each element were between 88.1%-101.2%. It indicated that the proposed method was applicable for the speciation analysis of copper, lead, zinc, cadmium and nickel in lead-zinc tailings. Three lead-zinc tailings samples were determined according to the experimental method. The results showed that the content of residual form of copper, lead, zinc, cadmium and nickel accounted for the maximum proportion with not less than 30% of total content. The content distribution sequence from high to low for lead and zinc was F4, F2, F1, F3. For copper and zinc, the sequence was F4,F3,F2,F1, while it was F4,F1,F3,F2 for cadmium. This proposed method provided important reference information for the comprehensive utilization of heavy metal elements in lead-zinc tailings region, the environmental impact assessment and the environmental governance.
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SHI Yi-hua,YANG Zhao-hong,XU hua,GU Xing-qian,QIU Li,TANG Bi-yu. Application of modified chemical sequential extraction-inductively coupled plasma mass spectrometry to determination of chemical speciation of copper,lead,zinc,cadinum and nickel in lead and zinc tailings. , 2016, 36(7): 83-88.
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