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Distribution and migration of heavy metals in soil and crops affected by acid mine drainage: Public health implications in Guangdong Province, China.
Ecotoxicol Environ Saf. 2016 Feb; 124:460-469.EE

Abstract

Acid mine drainages (AMD) contain high concentrations of heavy metals, and their discharges into streams and rivers constitute serious environmental problems. This article examines the effects of AMD on soil, plant and human health at Dabaoshan mine in Guangdong Province, China. Although the large scale mining was stopped in 2011, the heavy metal pollution in soil continues to endanger crops and human health in that region. The objectives of this study were to elucidate distribution and migration of Cd, Cu, Zn, As and Pb and associated health implications to local inhabitants. We collected and analyzed 74 crop samples including 28 sugarcane, 30 vegetables, 16 paddy rice and the corresponding soil samples, used correlation and linear relationship for transformation process analysis, and applied carcinogenic and non-carcinogenic risk for hazard evaluation. Results showed that the local soils were heavily polluted with Cd, Cu and As (especially for Cd) and the mean Igeo value was as high as 3.77. Cadmium, Cu, and Zn in rice and vegetables were comparable with those found four years ago, while As and Pb in edible parts were 2 to 5 times lower than before. The root uptake of Cd and Zn contributed mainly to their high concentrations in crops due to high exchangeable fraction of soil, while leafy vegetables accumulated elevated As and Pb contents mainly due to the atmospheric deposition. Metal concentrations in sugarcane roots were higher than those in rice and vegetable roots. The risk assessment for crops consumption showed that the hazard quotients values were of 21 to 25 times higher than the threshold level for vegetables and rice, indicating a potential non-carcinogenic risk to the consumers. The estimated mean total cancer risk value of 0.0516 more than 100 times exceeded the USEPA accepted risk level of 1×10(-4), indicating unsuitability of the soil for cultivating the food crops. Therefore, the local agricultural and the land-use policies need to be reevaluated.

Authors+Show Affiliations

School of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China.School of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China.School of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China.School of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China.School of Bioscience and Bioengineering, South China University of Technology, Guangzhou 510006, PR China.School of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China; Key Laboratory of Environmental Protection and Eco-Remediation of Guangdong Regular Higher Education Institutions, South China University of Technology, Guangzhou 510006, PR China. Electronic address: cechwei@scut.edu.cn.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

26629658

Citation

Liao, Jianbo, et al. "Distribution and Migration of Heavy Metals in Soil and Crops Affected By Acid Mine Drainage: Public Health Implications in Guangdong Province, China." Ecotoxicology and Environmental Safety, vol. 124, 2016, pp. 460-469.
Liao J, Wen Z, Ru X, et al. Distribution and migration of heavy metals in soil and crops affected by acid mine drainage: Public health implications in Guangdong Province, China. Ecotoxicol Environ Saf. 2016;124:460-469.
Liao, J., Wen, Z., Ru, X., Chen, J., Wu, H., & Wei, C. (2016). Distribution and migration of heavy metals in soil and crops affected by acid mine drainage: Public health implications in Guangdong Province, China. Ecotoxicology and Environmental Safety, 124, 460-469. https://doi.org/10.1016/j.ecoenv.2015.11.023
Liao J, et al. Distribution and Migration of Heavy Metals in Soil and Crops Affected By Acid Mine Drainage: Public Health Implications in Guangdong Province, China. Ecotoxicol Environ Saf. 2016;124:460-469. PubMed PMID: 26629658.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Distribution and migration of heavy metals in soil and crops affected by acid mine drainage: Public health implications in Guangdong Province, China. AU - Liao,Jianbo, AU - Wen,Zewei, AU - Ru,Xuan, AU - Chen,Jundong, AU - Wu,Haizhen, AU - Wei,Chaohai, Y1 - 2015/11/28/ PY - 2015/07/27/received PY - 2015/11/16/revised PY - 2015/11/19/accepted PY - 2015/12/3/entrez PY - 2015/12/3/pubmed PY - 2016/8/12/medline KW - Fraction extracting KW - Health risks KW - Linear correlation KW - Toxic metals KW - Transfer factor SP - 460 EP - 469 JF - Ecotoxicology and environmental safety JO - Ecotoxicol Environ Saf VL - 124 N2 - Acid mine drainages (AMD) contain high concentrations of heavy metals, and their discharges into streams and rivers constitute serious environmental problems. This article examines the effects of AMD on soil, plant and human health at Dabaoshan mine in Guangdong Province, China. Although the large scale mining was stopped in 2011, the heavy metal pollution in soil continues to endanger crops and human health in that region. The objectives of this study were to elucidate distribution and migration of Cd, Cu, Zn, As and Pb and associated health implications to local inhabitants. We collected and analyzed 74 crop samples including 28 sugarcane, 30 vegetables, 16 paddy rice and the corresponding soil samples, used correlation and linear relationship for transformation process analysis, and applied carcinogenic and non-carcinogenic risk for hazard evaluation. Results showed that the local soils were heavily polluted with Cd, Cu and As (especially for Cd) and the mean Igeo value was as high as 3.77. Cadmium, Cu, and Zn in rice and vegetables were comparable with those found four years ago, while As and Pb in edible parts were 2 to 5 times lower than before. The root uptake of Cd and Zn contributed mainly to their high concentrations in crops due to high exchangeable fraction of soil, while leafy vegetables accumulated elevated As and Pb contents mainly due to the atmospheric deposition. Metal concentrations in sugarcane roots were higher than those in rice and vegetable roots. The risk assessment for crops consumption showed that the hazard quotients values were of 21 to 25 times higher than the threshold level for vegetables and rice, indicating a potential non-carcinogenic risk to the consumers. The estimated mean total cancer risk value of 0.0516 more than 100 times exceeded the USEPA accepted risk level of 1×10(-4), indicating unsuitability of the soil for cultivating the food crops. Therefore, the local agricultural and the land-use policies need to be reevaluated. SN - 1090-2414 UR - https://www.unboundmedicine.com/medline/citation/26629658/Distribution_and_migration_of_heavy_metals_in_soil_and_crops_affected_by_acid_mine_drainage:_Public_health_implications_in_Guangdong_Province_China_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0147-6513(15)30170-6 DB - PRIME DP - Unbound Medicine ER -