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Geochemical characteristics of heavy metal contamination induced by a sudden wastewater discharge from a smelter
Yongqiang Yuan;  Meng Xiang;  Congqiang Liu;  Benny K.G. Theng
2017
Source PublicationJournal of Geochemical Exploration
Volume176Pages:33-41
Abstract

Metal contaminations from smelting have been widely reported, however, the study on metal mobility or transfer characteristics in soil profiles after a sudden wastewater overflow is far limited. This study was undertaken to investigate distribution and potential mobility of heavy metals in soils flooded by smelting wastewater in Hechi China. Total heavy metal/metalloid levels were measured in topsoil, profile and profile pore-water taken in-situ. Enrichment factor (EF) and nemero synthesis index (P-N) were used to detect the contribution of ahthropogenic emissions to trace element fluxes and pollution levels, respectively. Soil-water partition coefficient (IQ) was used to reflect the fate and the mobility of elements. Results showed topsoil were seriously contaminated with Sb (289-3100 mg kg(-1)), Pb (444-6388 mg kg(-1)), Zn (294-923 mg kg(-1)), Cu (59-192 mg kg(-1)), Cd (1234 mg kg(-1)), and As (32-405 kg(-1)), and PN values indicated this area was in severe or strongly pollution level. Higher EF values of Sb, Zn, Cd and As were found in the flooded soils, and PN in flooded area was 5 times of that in the unflooded sites, indicating wastewater flooding aggregated pollution in the low-lying area. The Sb, Pb, and Cd concentrations declined drastically with profile but dropped to constant levels below a depth of about 20 cm. In contrast, Zn and Cu in flooding soils declined first and then increased to another extreme value even at depth of 50 cm. Pore-water profiles exhibited the similar declining trends of vertical metal/metalloid distribution pattern. The IQ values ranged from 102-106 Lkg(-1), and the mobility and bioavailability of the six elements in the profiles declined in the following order: Sb > Zn > Cu > Cd > As > Pb. The relatively low IQ values for some depth intervals may reflect adsorption decrease or migration increase of metal/metalloid. However, it is worth to further study and assess their potential risk to environment in longer period. 

KeywordWastewater Overflow Heavy Metal Contamination Enrichment Mobility
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/8167
Collection环境地球化学国家重点实验室
Affiliation1.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
2.Huatian Engineering & Technology Corporation, MCC, Nanjing 243000, China
3.Landcare Research, Private Bag 11052, Palmerston North 4442, New Zealand
Recommended Citation
GB/T 7714
Yongqiang Yuan;Meng Xiang;Congqiang Liu;Benny K.G. Theng. Geochemical characteristics of heavy metal contamination induced by a sudden wastewater discharge from a smelter[J]. Journal of Geochemical Exploration,2017,176:33-41.
APA Yongqiang Yuan;Meng Xiang;Congqiang Liu;Benny K.G. Theng.(2017).Geochemical characteristics of heavy metal contamination induced by a sudden wastewater discharge from a smelter.Journal of Geochemical Exploration,176,33-41.
MLA Yongqiang Yuan;Meng Xiang;Congqiang Liu;Benny K.G. Theng."Geochemical characteristics of heavy metal contamination induced by a sudden wastewater discharge from a smelter".Journal of Geochemical Exploration 176(2017):33-41.
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