干旱区生态环境知识资源中心(Arid): Geochemical occurrence of arsenic, vanadium and fluoride in groundwater of Patagonia, Argentina: Sources and mobilization processes

Arid

DOI	10.1016/j.jsames.2018.10.006
	Geochemical occurrence of arsenic, vanadium and fluoride in groundwater of Patagonia, Argentina: Sources and mobilization processes
	del Pilar Alvarez, Maria 1; Carol, Eleonora 2
通讯作者	del Pilar Alvarez, Maria
来源期刊	JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
ISSN	0895-9811
出版年	2019
卷号	89 页码:1-9
英文摘要	Contamination of groundwater in different parts of the world is a result of natural and/or anthropogenic sources, leading to adverse effects on human health and the ecosystem. In Peninsula Valdes, where groundwater is the only source of supply, high concentrations of As and F- were registered. Since it is a region without industrial activity, an analysis of possible natural sources of contamination is necessary. The aim of this study is to analyse the hydrological processes that determines the presence and mobilization of those elements through the analysis of the mineralogy of the aquifer sediments and the ionic water relationships. The productive aquifer, dominated by psamites, coquinas and siltstone is located between 29 and 42 m below ground surface. The hydrochemistry studied from 105 sampling points, shows that groundwater is dominated by Na-Cl ions and, in the fresh Water sectors, the ionic type is Na-HCO3 to Na-Cl. In 17 of these samples, Zn, Cr, Mn, As, V, Sr, Fe, F ions were measured and As and F contents above the potability limit were recorded. These contents vary between 0.01 and 0.40 mg/L in As and between 0.31 and 4 in F- which are both associated with elevated V values. The optical petrographic microscope observations and the X-ray diffraction measurements show that the sediments are dominated by volcanic lithic fragments, volcanic glass shards and quartz, plagioclase, pyroxenes and magnetite clasts. The scanning electron microscopy, combined with the energy dispersive X-ray analysis, shows that the highest concentrations of As are associated with volcanic shards and iron oxides. The combined analysis of all these elements leads to conclude that the processes which explain the presence of those ions are a result of the interaction of groundwater with the components of the aquifer sediments. At alkaline pH, the high solubility of the amorphous silica of vitreous shards allows the release of As, V and F- ions towards the solution. Thus, adsorption-desorption processes can also control the presence of these ions in groundwater. Both As and V (in solution in the form of oxyanions) can be adsorbed by iron oxides, while F- anions have more affinity to be adsorbed by the carbonate fades, some of them re-precipitated as a result of the increase in pH. The identified hydrogeological processes provide information for the planning of water purification measures that tend to improve the water resources management in a large arid region of Patagonia.
英文关键词	Hydrogeochemical processes Groundwater Sediment interaction Trace elements Water supply Peninsula valdes
类型	Article
语种	英语
国家	Argentina
收录类别	SCI-E
WOS记录号	WOS:000461405700001
WOS关键词	DRINKING-WATER ; NORTHERN CHILE ; ADSORPTION ; REGION ; PROVINCE ; REMOVAL ; GENESIS
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/217331
作者单位	1.Consejo Nacl Invest Cient & Tecn, Consejo Nacl Invest Cient & Tecn, Inst Patagon Estudio Ecosistemas Continentales, Buenos Aires, DF, Argentina; 2.Univ Nacl La Plata, CONICET, Consejo Nacl Invest Cient & Tecn, Ctr Invest Geol, La Plata, Buenos Aires, Argentina
推荐引用方式 GB/T 7714	del Pilar Alvarez, Maria,Carol, Eleonora. Geochemical occurrence of arsenic, vanadium and fluoride in groundwater of Patagonia, Argentina: Sources and mobilization processes[J],2019,89:1-9.
APA	del Pilar Alvarez, Maria,&Carol, Eleonora.(2019).Geochemical occurrence of arsenic, vanadium and fluoride in groundwater of Patagonia, Argentina: Sources and mobilization processes.JOURNAL OF SOUTH AMERICAN EARTH SCIENCES,89,1-9.
MLA	del Pilar Alvarez, Maria,et al."Geochemical occurrence of arsenic, vanadium and fluoride in groundwater of Patagonia, Argentina: Sources and mobilization processes".JOURNAL OF SOUTH AMERICAN EARTH SCIENCES 89(2019):1-9.