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Ammonia nitrogen sources and pollution along soil profiles in an in-situ leaching rare earth ore
Zhang, Qiuying1; Ren, Futian2,3,5; Li, Fadong2,3,4; Chen, Guoliang6; Yang, Guang2,5; Wang, Jianqi3; Du, Kun3,4; Liu, Shanbao3,4; Li, Zhao3,4
2020-12-01
Source PublicationENVIRONMENTAL POLLUTION
ISSN0269-7491
Volume267Pages:11
Corresponding AuthorZhang, Qiuying(zhangqy@craes.org.cn)
AbstractThe ammonium sulphate ((NH4)(2)SO4) in-situ leaching process is the most widely used extraction technology for weathered crust elution-deposited rare earth ores (WCED-REOs). Highly concentrated (NH4)(2)SO4, a representative leaching agent, is often used in the leaching process of WCED-REOs. However, this in-situ leaching process causes nitrogen pollution in the soil, surrounding surface and ground water due to the high concentrations of (NH4)(2)SO4 solutions used as a long term leaching agent. To date, the mechanism behind the variations in ammonia nitrogen (AN) in deep soil profiles is unclear. We conducted vertical and lateral soil sampling and analyzed the collected samples for soil moisture, pH, ammonia forms, and AN contents in soil profiles deeper than 500 cm in an in-situ leaching mining area of Ganzhou, Jiangxi Province, southern China. The results show that primary chemical pollutants in the soil are derived from residual leaching agents with high acidities and concentrations of AN. Twelve years after the mining process was completed, the mean pH values of the tailings in the mining area were 3.90 and 4.87 in its lower reaches. Due to the presence of chemical residues, the AN concentration was 12-40 times higher than that of the raw ore soil before it was mined. The percentages of different ammonium forms in the rare earth tailing soil were 65%, 30%, and 5% for the water-soluble, exchangeable, and fixed ammonium forms, respectively. The results of this study support effective prevention and remediation treatment of environmental problems caused by AN pollution of the soil in WCED-REOs. (C) 2020 Elsevier Ltd. All rights reserved.
KeywordWeathered crust elution-deposited rare earth mining Ammonia nitrogen Deep soil profile Ammonium form pH
DOI10.1016/j.envpol.2020.115449
Indexed BySCI
Language英语
Funding ProjectFinancial of National Key Research and Development Project of China[2018YFC1801801] ; Financial of National Key Research and Development Project of China[2016YFD0800301]
Funding OrganizationFinancial of National Key Research and Development Project of China
WOS Research AreaEnvironmental Sciences & Ecology
WOS SubjectEnvironmental Sciences
WOS IDWOS:000631909700030
PublisherELSEVIER SCI LTD
Citation statistics
Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/162079
Collection中国科学院地理科学与资源研究所
Corresponding AuthorZhang, Qiuying
Affiliation1.Chinese Res Inst Environm Sci, Beijing, Peoples R China
2.Shihezi Univ, Coll Water & Architectural Engn, Shihezi, Peoples R China
3.Inst Geog Sci & Nat Resources Res, Beijing, Peoples R China
4.Univ Chinese Acad Sci, Beijing, Peoples R China
5.Xinjiang Prod & Construct Grp, Key Lab Modern Water Saving Irrigat, Shihezi, Peoples R China
6.Ganzhou Rare Earth Min Co Ltd, Ganzhou, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Qiuying,Ren, Futian,Li, Fadong,et al. Ammonia nitrogen sources and pollution along soil profiles in an in-situ leaching rare earth ore[J]. ENVIRONMENTAL POLLUTION,2020,267:11.
APA Zhang, Qiuying.,Ren, Futian.,Li, Fadong.,Chen, Guoliang.,Yang, Guang.,...&Li, Zhao.(2020).Ammonia nitrogen sources and pollution along soil profiles in an in-situ leaching rare earth ore.ENVIRONMENTAL POLLUTION,267,11.
MLA Zhang, Qiuying,et al."Ammonia nitrogen sources and pollution along soil profiles in an in-situ leaching rare earth ore".ENVIRONMENTAL POLLUTION 267(2020):11.
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