Saline groundwater in the Münsterland Cretaceous Basin, Germany: clues to its origin and evolution

Grobe, Matthias; Machel, Hans G.

doi:10.1016/s0264-8172(02)00019-3

Cited by 40 publications

(12 citation statements)

References 23 publications

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“…1). This phenomenon is observed since centuries and has been described, among others, by Heck (1932), Johannsen (1980), Hannemann and Schirrmeister (1998), Grube et al (2000a), Grobe and Machel (2002).…”

Section: Introductionmentioning

confidence: 61%

Salinization problems in the NEGB: results from thermohaline simulations

Magri

Bayer

Tesmer

et al. 2007

Int J Earth Sci (Geol Rundsch)

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The occurrence of salty waters close to the surface is a well-known problem in the North East German Basin. Previous numerical simulations showed that nearsurface brine occurrences are due to the interaction of hydrostatic and thermally induced forces (mixed convection). The influence of hydraulic permeabilities and thermal conductivities on the observed patterns remained an open question. Based on a hydro-geochemical dataset, thermohaline simulations are carried out in order to quantify the impact of these physical parameters on brine migration. The results indicate that the salinity and temperature profiles are strongly controlled by hydraulic permeabilities and can locally be influenced by thermal conductivities.

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Section: Introductionmentioning

confidence: 61%

Salinization problems in the NEGB: results from thermohaline simulations

Magri

Bayer

Tesmer

et al. 2007

Int J Earth Sci (Geol Rundsch)

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“…The other samples were higher in pH, between 4.8 and 7.1, and had significantly lower metal concentrations. Very high eC values in sample 6 (&50 mS cm -1 ) at neutral pH may be explainable by abundant saline waters in that mining area (Grobe and Machel 2002). Samples 9 and 10 were artificially prepared (see text).…”

Section: Resultsmentioning

confidence: 99%

A New Approach to Quantify Na-Fluorescein (Uranine) in Acid Mine Waters

et al. 2011

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Sodium fluorescein (uranine) is one of the most popular fluorescent dyes for tracer experiments due to its chemical properties, low detection limits and low costs. As a limiting factor, it is generally assumed that Na-fluorescein cannot be properly detected under acid conditions because of weak fluorescence intensities at the standard excitation wavelength (490 nm). This laboratory study introduces a method to quantify Na-fluorescein in low pH waters without having to raise pH to alkaline conditions, which spares the time-and cost-intensive filtration of hydroxide precipitates prior to analysis. It was applied for recovery tests in water samples from five mining sites in Germany. These were buffered to pH 1.5 where Na-fluorescein shows a second fluorescence intensity maximum at an excitation wavelength of 438 nm. The method had satisfying recovery rates although, as expected, a higher detection limit compared to standard wavelength and pH. High Fe contents in the waters are a limiting factor-the impact of increasing Fe concentrations at a constant dye spike was evaluated and yielded a distinct negative trend between Fe and detected Na-fluorescein, probably due to Fe-fluorescein complexation. However, good recovery can be expected in mine waters with up to &100 mg L -1 Fe. The method of standard addition offers a potential calculative solution for higher Fe concentrations, resulting in significantly better Na-fluorescein recovery rates, compared to direct measurements. The method introduced here represents a promising approach for improving Na-fluorescein applicability in acid environments.

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“…The strontium concentrations increase from 54 μg/l for facies 1 potable spring-water to 815 μg/l to 3710 μg/ l (mean 1950 μg/l) for facies 2 groundwaters, to 21540 μg/l for facies 3 lake brine. Those minerals have relatively high strontium concentrations but generally low 87 Sr/ 86 Sr ratios similar to that of the fluid (groundwater) from which they formed, and contain significant amounts of 87 Rb and, thus, produce radiogenic 87 Sr, resulting in 87 Sr/ 86 Sr ratios that increase with age (e.g., Grobe and Machel, 2002).…”

Section: Hydrochemistrymentioning

confidence: 99%