Geofluids / 2019 / Article / Tab 3

Research Article

A Review of the Hydrochemistry of a Deep Sedimentary Aquifer and Its Consequences for Geothermal Operation: Klaipeda, Lithuania

Table 3

Chemical composition of groundwater from Klaipeda Geothermal Demonstration Plant, showing analysis on a sample collected 5/10/2012 [17], three samples collected and analysed by GFZ-Potsdam in March-July 2016 from well 2P, and a sample collected on 5/4/17, from bulk water storage, and analysed by Glasgow University/SUERC. The final column shows standard sea water as reported by [18, 19]. An analysis of water from 2P in 2010 [9] reported concentrations of 3.2 μg/L As and 0.06 μg/L U. Additional analyses are available in GTN reports [16].

Gerber et al.2P wellhead2P filter2PGlasgow 2P stored waterSeawater
Sample date5/10/1231/3/161/4/1619/7/20165/4/17

Field parameters
 Dissolved O2mg/L0.850.900.45

Laboratory analysis
 Total dissolved solidsmg/L88,52334,483
 Total organic carbonmg/L12
Major cations

Major anions
 NO3-mg/L (as NO3-)<1.6<0.6<0.6

Minor elements


 Cl/Br mass ratio156159171145311292
 Li/Cl mass ratio6.14-056.02-055.63-055.48-058.96-06

 Mg/Sr mass ratio1514141497

 B/Cl mass ratio0.000200.000160.000150.000150.00024

δ18O‰ SMOW-4.46-4.5
δ2H‰ SMOW-34.7-26
39Ar% modern<14

Based on a cited total inorganic carbon (TIC) of 16.6 mg/L [17]. As some of the TIC may be carbonic acid, the figure of 84 mg/L may be somewhat overestimated.

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