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Chemical fraction, leachability, and bioaccessibility of heavy metals in contaminated soils, Northeast China.
Environ Sci Pollut Res Int. 2016 Dec; 23(23):24107-24114.ES

Abstract

Heavy metals in urban soils may pose risks to both urban environment and human health. However, only a fraction of heavy metals in soil is mobile and/or bioavailable for plant uptake and human ingestion. This study evaluates the chemical fraction and potential mobility and bioaccessibility of heavy metals (Cd, Cr, Cu, Pb, and Zn) in the contaminated urban topsoils from steel-industrial city (Anshan), Northeastern China. Chemical forms of heavy metals in soils are determined using Tessier sequential extraction technique. The toxicity characteristic leaching procedure (TCLP), ethylenediaminetetraacetic acid (EDTA), and US Pharmacopeia methodology (USPM) are used to determine the operationally defined potentially mobile and bioaccessible metal fractions, respectively. Sequential extraction results show that Cd has the highest percentage of exchangeable form, whereas Cr primarily exists in residual form. The non-residual fraction of heavy metals increases in the order of Cr < Cu < Pb < Zn < Cd. The leachability of heavy metals evaluated by TCLP test indicates that Cd, Zn, Cu, and Pb have much higher mobile than Cr. The bioavailability of heavy metals determined by EDTA extraction decreases in the order of Pb > Cu ≅ Zn > Cd > Cr. The order of bioaccessibility determined by USPM extraction is Pb = Cu > Zn > Cd > Cr. The Cr exhibits the lowest leachability and bioaccessibility among the investigated metals. The Pb has the highest bioaccessibility, indicating higher potential hazard for the human health. There are significant relationships between the EDTA- and USPM-extractable metals (Cd, Cu, Pb, and Zn) and the sum of first three steps of sequential extraction. Highly significant correlation is found between amounts of EDTA-extractable Cd, Cu, Pb, and Zn and USPM-extractable metals. The result suggests that EDTA extraction can be helpful to estimate the bioaccessibility of heavy metals for human ingestion. Introduction of mobile and human bioaccessible concentrations into risk assessments can give more realistic implications for urban environmental management.

Authors+Show Affiliations

Zhejiang Provincial Key Laboratory of Subtropical Soil and Plant Nutrition, Zhejiang University, Hangzhou, 310058, China. Key Laboratory of Environmental Remediation and Ecosystem Health, Ministry of Education, Zhejiang University, Hangzhou, 310058, China. College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, 310058, China.Zhejiang Provincial Key Laboratory of Subtropical Soil and Plant Nutrition, Zhejiang University, Hangzhou, 310058, China. Key Laboratory of Environmental Remediation and Ecosystem Health, Ministry of Education, Zhejiang University, Hangzhou, 310058, China. College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, 310058, China.Zhejiang Provincial Key Laboratory of Subtropical Soil and Plant Nutrition, Zhejiang University, Hangzhou, 310058, China. lusg@zju.edu.cn. Key Laboratory of Environmental Remediation and Ecosystem Health, Ministry of Education, Zhejiang University, Hangzhou, 310058, China. lusg@zju.edu.cn. College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, 310058, China. lusg@zju.edu.cn.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

27640054

Citation

Yutong, Zong, et al. "Chemical Fraction, Leachability, and Bioaccessibility of Heavy Metals in Contaminated Soils, Northeast China." Environmental Science and Pollution Research International, vol. 23, no. 23, 2016, pp. 24107-24114.
Yutong Z, Qing X, Shenggao L. Chemical fraction, leachability, and bioaccessibility of heavy metals in contaminated soils, Northeast China. Environ Sci Pollut Res Int. 2016;23(23):24107-24114.
Yutong, Z., Qing, X., & Shenggao, L. (2016). Chemical fraction, leachability, and bioaccessibility of heavy metals in contaminated soils, Northeast China. Environmental Science and Pollution Research International, 23(23), 24107-24114.
Yutong Z, Qing X, Shenggao L. Chemical Fraction, Leachability, and Bioaccessibility of Heavy Metals in Contaminated Soils, Northeast China. Environ Sci Pollut Res Int. 2016;23(23):24107-24114. PubMed PMID: 27640054.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Chemical fraction, leachability, and bioaccessibility of heavy metals in contaminated soils, Northeast China. AU - Yutong,Zong, AU - Qing,Xiao, AU - Shenggao,Lu, Y1 - 2016/09/17/ PY - 2016/05/20/received PY - 2016/09/04/accepted PY - 2016/9/19/pubmed PY - 2017/3/7/medline PY - 2016/9/19/entrez KW - Bioaccessibility KW - Chemical form KW - Heavy metal KW - Leachability KW - Sequential extraction KW - Urban soil SP - 24107 EP - 24114 JF - Environmental science and pollution research international JO - Environ Sci Pollut Res Int VL - 23 IS - 23 N2 - Heavy metals in urban soils may pose risks to both urban environment and human health. However, only a fraction of heavy metals in soil is mobile and/or bioavailable for plant uptake and human ingestion. This study evaluates the chemical fraction and potential mobility and bioaccessibility of heavy metals (Cd, Cr, Cu, Pb, and Zn) in the contaminated urban topsoils from steel-industrial city (Anshan), Northeastern China. Chemical forms of heavy metals in soils are determined using Tessier sequential extraction technique. The toxicity characteristic leaching procedure (TCLP), ethylenediaminetetraacetic acid (EDTA), and US Pharmacopeia methodology (USPM) are used to determine the operationally defined potentially mobile and bioaccessible metal fractions, respectively. Sequential extraction results show that Cd has the highest percentage of exchangeable form, whereas Cr primarily exists in residual form. The non-residual fraction of heavy metals increases in the order of Cr < Cu < Pb < Zn < Cd. The leachability of heavy metals evaluated by TCLP test indicates that Cd, Zn, Cu, and Pb have much higher mobile than Cr. The bioavailability of heavy metals determined by EDTA extraction decreases in the order of Pb > Cu ≅ Zn > Cd > Cr. The order of bioaccessibility determined by USPM extraction is Pb = Cu > Zn > Cd > Cr. The Cr exhibits the lowest leachability and bioaccessibility among the investigated metals. The Pb has the highest bioaccessibility, indicating higher potential hazard for the human health. There are significant relationships between the EDTA- and USPM-extractable metals (Cd, Cu, Pb, and Zn) and the sum of first three steps of sequential extraction. Highly significant correlation is found between amounts of EDTA-extractable Cd, Cu, Pb, and Zn and USPM-extractable metals. The result suggests that EDTA extraction can be helpful to estimate the bioaccessibility of heavy metals for human ingestion. Introduction of mobile and human bioaccessible concentrations into risk assessments can give more realistic implications for urban environmental management. SN - 1614-7499 UR - https://www.unboundmedicine.com/medline/citation/27640054/Chemical_fraction_leachability_and_bioaccessibility_of_heavy_metals_in_contaminated_soils_Northeast_China_ DB - PRIME DP - Unbound Medicine ER -