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Naturally occurring arsenic in terrestrial geothermal systems of western Anatolia, Turkey: Potential role in contamination of freshwater resources
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Land and Water Resources Engineering. (KTH-International Groundwater Arsenic Research Group)
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2013 (English)In: Journal of Hazardous Materials, ISSN 0304-3894, E-ISSN 1873-3336, Vol. 262, 951-959 p.Article in journal (Refereed) Published
Abstract [en]

Arsenic (As) contamination in terrestrial geothermal systems has been identified in many countries worldwide. Concentrations higher than 0.01mg/L are detrimental to human health. We examined potential consequences for As contamination of freshwater resources based on hydrogeochemical investigations of geothermal waters in deep wells and hot springs collected from western Anatolia, Turkey. We analyzed samples for major ions and trace element concentrations. Temperature of geothermal waters in deep wells showed extreme ranges (40 and 230°C), while, temperature of hot spring fluids was up to 90°C. The Piper plot illustrated two dominant water types: Na-HCO3 - type for geothermal waters in deep wells and Ca-HCO3 - type for hot spring fluids. Arsenic concentration ranged from 0.03 to 1.5mg/L. Dominance of reduced As species, i.e., As(III), was observed in our samples. The Eh value ranged between -250 and 119mV, which suggests diverse geochemical conditions. Some of the measured trace elements were found above the World Health Organization guidelines and Turkish national safe drinking water limits. The variation in pH (range: 6.4-9.3) and As in geothermal waters suggest mixing with groundwater. Mixing of geothermal waters is primarily responsible for contamination of freshwater resources and making them unsuitable for drinking or irrigation.

Place, publisher, year, edition, pages
2013. Vol. 262, 951-959 p.
Keyword [en]
Arsenic, Environmental contamination, Geothermal wells, Hot springs, Turkey
National Category
Other Earth and Related Environmental Sciences
URN: urn:nbn:se:kth:diva-139929DOI: 10.1016/j.jhazmat.2013.01.039ISI: 000329595500114ScopusID: 2-s2.0-84887616030OAI: diva2:688607
Mistra - The Swedish Foundation for Strategic Environmental ResearchSida - Swedish International Development Cooperation Agency, 750000854

QC 20140117

Available from: 2014-01-17 Created: 2014-01-15 Last updated: 2014-02-17Bibliographically approved

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