NDLI: Anomalous arsenic concentrations in the Ďurkov carbonate geothermal structure, eastern Slovakia

Content Provider	Springer Nature Link
Author	Vranovská, A. Bodiš, D. Sracek, O. Ženišová, Z.
Copyright Year	2014
Abstract	Concentrations of As in carbonate reservoirs in Slovakia are relatively low, with an average value of 0.72 mg/l in typical waters of Ca–Mg–HCO$_{3}$ type. In factor analysis, arsenic is in Factor 1 with Na and Cl, separated from carbonate aquifer species Ca and Mg in Factor 2. A principal exception is the Ďurkov site in eastern Slovakia, where As concentration reaches 36.7 mg/l (median 30 mg/l) in geothermal waters of the Na–Cl type. The δ$^{2}$H and δ$^{18}$O isotopes indicate a primary meteoric origin of the water. Low δ$^{2}$H and $^{14}$C reflect infiltration of surface water during a warmer climatic period in the Early Holocene, meanwhile positive δ$^{18}$O shift (about 5 ‰) suggests enhanced water–rock interactions. The conceptual model of As-rich water formation includes the following steps: (a) Infiltration of meteoric waters and dissolution of evaporates, especially halite, in the overlying Neogene formation (b) reaction of the highly mineralized water with Hg–As–Sb type of mineralization, related to the Neogene volcanism, and, (c) accumulation of As-rich geothermal water in Triassic carbonates with an additional input of CO$_{2}$. Geochemical modeling of the reaction between water and arsenopyrite reproduced measured As concentrations for a typical range of reservoir temperatures. Analogous to similar geothermal sites around the world, concentrations of arsenic in carbonate reservoirs in Slovakia are low except for cases where As is enriched by previous water–rock interaction related to Neogene volcanic activity outside the carbonate reservoirs, which then serve exclusively for a secondary accumulation of As-rich waters.
Starting Page	7103
Ending Page	7114
Page Count	12
File Format	PDF
ISSN	18666280
Journal	Environmental Earth Sciences
Volume Number	73
Issue Number	11
e-ISSN	18666299
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-11-28
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Arsenic Geothermal waters Carbonate reservoirs Slovakia Geology Hydrology/Water Resources Geochemistry Environmental Science and Engineering Terrestrial Pollution Biogeosciences
Content Type	Text
Resource Type	Article
Subject	Global and Planetary Change Earth-Surface Processes Soil Science Environmental Chemistry Pollution Geology Water Science and Technology

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