| 光谱学与光谱分析 |
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| Content Determination of Different Species of Pb, As, and Cd in the Municipal Sewage Sludge of Beijing with ICP-MS |
| CHEN Si-yang, WANG Juan, LI Li-na, HAN We-xuan*, JIANG Rong-feng |
| Department of Environmental Science and Engineering, China Agricultural University, Beijing 100193, China |
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Abstract Heavy metals in municipal sewage sludge can limit the utilization of sludge resources, due to their recalcitrant characteristics and harmful effects. Here, ICP-MS was used to determine the total and special content of Pb, As and Cd in the sewage sludge from G and Q Wastewater Treatment Plants, Beijing. The air-dried samples were dissolved in HNO3-HClO4 before the total content determination, or, sequentially extracted with BCR three-step method before special content determination for the heavy metals. The total contents are 19.60, 37.96 and 1.34 mg·kg-1 dry weight (DW) for Pb, As and Cd in the sewage sludge from G Plant, respectively; or, 19.58, 23.46 and 2.30 mg·kg-1 DW in that from Q Plant, respectively. Pb and Cd decreased dramatically in the total contents, compared to the corresponding data in the late 20th century. Both G and Q sludge samples show similar patterns in the species distribution for the three heavy metals: most of Pb and As are HAc soluble, and least are H2O2 oxidative; while Cd mainly exists in NH2OH-HCl reductive state, seldom in HAc soluble state. Species with high ecotoxicity account for a major part (over 70%) of the three species for all the metals on the whole. The authors’ results provide basic data for the ecological risk assessment and utilization of municipal sewage sludge from Beijing.
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Received: 2008-06-10
Accepted: 2008-09-15
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Corresponding Authors:
HAN We-xuan
E-mail: hanwenxuan@cau.edu.cn
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