Arid
DOI10.1016/j.scitotenv.2015.09.070
Water acidification trends in a reservoir of the Iberian Pyrite Belt (SW Spain)
Canovas, C. R.1; Olias, M.2; Macias, F.1; Torres, E.3; Miguel, E. G. San4; Galvan, L.2; Ayora, C.3; Nieto, J. M.1
通讯作者Canovas, C. R.
来源期刊SCIENCE OF THE TOTAL ENVIRONMENT
ISSN0048-9697
EISSN1879-1026
出版年2016
卷号541页码:400-411
英文摘要

Scarcity of waters is the main limiting factor of economic development inmost arid and semi-arid regions worldwide. The construction of reservoirs may be an optimal solution to assure water availability if the drainage area shows low disturbances. This is the quandary of mining areas where economic development relies on water accessibility. Water acidification trends were investigated in the Sancho Reservoir (SW Spain) in the last 20 years. The acidity (pH 3-5) and high dissolved metal concentrations (e.g., 4.4 mg/L of Al, 2.1mg/L of Mn, 1.9 mg/L of Zn) observed in the Sancho, together with the large volume stored (between 37 and 55 Mm(3)), makes this reservoir an extreme case of surface water pollution worldwide. A progressive acidification has been observed since 2003, as evidenced by decreasing pH values and increasing dissolved metal concentrations, especially noticeable after 2007. The increase in the net acidity in the reservoir originates from the higher input of metals and acidity due to the rebound effect after the mining closure in 2001. This trend was not detected in the river feeding the reservoir due to its great hydrological and hydrochemical variability, typical of the Mediterranean climate. Chemical analysis and absolute dating of sediments identified a progressive enrichment in S and metals (i.e., Fe, Zn Cu, Ni, Co and Cd) in the upper 20 cm, which reinforce the year 2002/03 as the onset of the acidification of the reservoir. The decrease of pH values from 4-5 to 3-4 occurred later than the increase in sulfate and metals due to pH-buffering by Al. The acid mine drainage (AMD) pressure has caused an increment of dissolved Fe and other metals, as well as a change in the pH buffering role, exerted now by Fe. These processes were simulated by PHREEQC, which confirms that the acidification trend will continue, causing pH values to reach 2.5 if AMD pressure persists. (C) 2015 Elsevier B.V. All rights reserved.


英文关键词Hydrological modeling Sediment dating pH-buffering Rebound effect
类型Article
语种英语
国家Spain
收录类别SCI-E
WOS记录号WOS:000365289300044
WOS关键词ACID-MINE DRAINAGE ; NATURAL ATTENUATION ; CONTAMINANT LOAD ; LAND-USE ; TINTO ; SEDIMENT ; POLLUTION ; ESTUARY ; METALS ; LAKE
WOS类目Environmental Sciences
WOS研究方向Environmental Sciences & Ecology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/196186
作者单位1.Univ Huelva, Fac Expt Sci, Dept Geol, Huelva 21071, Spain;
2.Univ Huelva, Fac Expt Sci, Dept Geodynam & Paleontol, Huelva 21071, Spain;
3.CSIC, Inst Environm Assessment & Water Res IDAEA, ES-08034 Barcelona, Spain;
4.Univ Huelva, Fac Expt Sci, Dept Appl Phys, Huelva 21071, Spain
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GB/T 7714
Canovas, C. R.,Olias, M.,Macias, F.,et al. Water acidification trends in a reservoir of the Iberian Pyrite Belt (SW Spain)[J],2016,541:400-411.
APA Canovas, C. R..,Olias, M..,Macias, F..,Torres, E..,Miguel, E. G. San.,...&Nieto, J. M..(2016).Water acidification trends in a reservoir of the Iberian Pyrite Belt (SW Spain).SCIENCE OF THE TOTAL ENVIRONMENT,541,400-411.
MLA Canovas, C. R.,et al."Water acidification trends in a reservoir of the Iberian Pyrite Belt (SW Spain)".SCIENCE OF THE TOTAL ENVIRONMENT 541(2016):400-411.
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