Bioavailability Assessment of Heavy Metals Using Various Multi-Element Extractants in an Indigenous Zinc Smelting Contaminated Site, Southwestern China

被引:24
作者
Wang, Jun-Xian [1 ,2 ]
Xu, Da-Mao [1 ,3 ,4 ]
Fu, Rong-Bing [1 ,3 ,4 ]
Chen, Jia-Peng [3 ]
机构
[1] Tongji Univ, Ctr Environm Risk Management & Remediat Soil & Gr, Shanghai 200092, Peoples R China
[2] Univ Southern Calif, Viterbi Sch Engn, Los Angeles, CA 90089 USA
[3] Tongji Univ, Coll Environm Sci & Engn, State Key Lab Pollut Control & Resources Reuse, Shanghai 200092, Peoples R China
[4] Shanghai Inst Pollut Control & Ecol Secur, Shanghai 200092, Peoples R China
关键词
indigenous smelting contaminated soils; heavy metals; bioavailability; fractionation; release kinetics; RISK-ASSESSMENT; SOILS; SPECIATION; BIOACCESSIBILITY; KINETICS; COUNTY; PLANTS; AREA;
D O I
10.3390/ijerph18168560
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Despite recent studies have investigated the strong influences of smelting activities on heavy metal contamination in the soil environment, little studies have been conducted on the current information about the potential environmental risks posed by toxic heavy metals in smelting contaminated sites. In the present study, a combination of the bioavailability, speciation, and release kinetics of toxic heavy metals in the indigenous zinc smelting contaminated soil were reliably used as an effective tool to support site risk assessment. The bioavailability results revealed that the bioavailable metal concentrations were intrinsically dependent on the types of chemical extractants. Interestingly, 0.02 mol/L EDTA + 0.5 mol/L CH3COONH4 was found to be the best extractant, which extracted 30.21% of Cu, 31.54% of Mn, 2.39% of Ni and 28.89% of Zn, respectively. The sequential extraction results suggested that Cd, Pb, and Zn were the most mobile elements, which would pose the potential risks to the environment. The correlation of metal bioavailability with their fractionation implied that the exchangeable metal fractions were easily extracted by CaCl2 and Mehlich 1, while the carbonate and organic bound metal fractions could be extracted by EDTA and DTPA with stronger chelating ability. Moreover, the kinetic modeling results suggested that the chemical desorption mechanism might be the major factor controlling heavy metal release. These results could provide some valuable references for the risk assessment and management of heavy metals in the smelting contaminated sites.
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页数:11
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