Tracers for Ground Water Investigations

Knutsson, Gert

doi:10.1016/b978-0-08-003468-3.50011-2

Cited by 7 publications

(2 citation statements)

References 17 publications

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“…Such an environmental consortium contains all the species present in the natural system and was used instead of a pure culture to mimic natural conditions. The initial effective porosity was 0.33 and was measured with a NaBr tracer by determining when 50% of the tracer had exited the column [ Knutsson , 1966; Freeze and Cherry , 1979]. Sterile, anoxic, 1,4‐Piperazinediethansulfonic acid (PIPES)‐buffered artificial groundwater (PBAGW) with 1 m M acetate and <5 µ M Fe(II) aq (hereafter [Fe(II) (aq) ] in ) was pumped at 2 mL h −1 through Teflon tubing using a glass syringe pump.…”

Section: Laboratory Experimentsmentioning

confidence: 99%

Electrical conductivity as an indicator of iron reduction rates in abiotic and biotic systems

Regberg

Singha

Picardal

et al. 2011

Water Resources Research

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[1] Although changes in bulk electrical conductivity ( b ) in aquifers have been attributed to microbial activity, b has never been used to infer biogeochemical reaction rates quantitatively. To explore the use of electrical conductivity to measure reaction rates, we conducted iron oxide reduction experiments of increasing biological complexity. To quantify reaction rates, we propose composite reactions that incorporate the stoichiometry of five different types of reactions: redox, acid-base, sorption, dissolution/precipitation, and biosynthesis. In batch experiments and the early stages of a column experiment, such reaction stoichiometries inferred from a few chemical measurements allowed quantification of the Fe oxide reduction rate based on changes in electrical conductivity. The relationship between electrical conductivity and fluid chemistry did not hold during the latter stages of the column experiment when b increased while fluid chemistry remained constant. Growth of an electrically conductive biofilm could possibly explain this late stage b increase. The measured b increase is consistent with a model proposed by analogy from percolation theory that attributes the increased conductivity to growth of biofilms with conductivity of $5.5 S m À1 in at least 3% of the column pore space. This work demonstrates that measurements of b and flow rate, combined with a few direct chemical measurements, can be used to quantify biogeochemical reaction rates in controlled laboratory situations and may be able to detect the presence of biofilms. This approach may help in designing future field experiments to interpret biogeochemical reactivity from conductivity measurements.

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Section: Laboratory Experimentsmentioning

confidence: 99%

Electrical conductivity as an indicator of iron reduction rates in abiotic and biotic systems

Regberg

Singha

Picardal

et al. 2011

Water Resources Research

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“…Experiments with tracers are useful for understanding groundwater transport and quantifying its parameters in situ without destroying the rock structure and without intrusion into the natural geological environment. The tracer method is used to determine groundwater discharge areas, river water flow rate, groundwa-ter flow in the karst region, soil tests, and possible pollution analysis (Hall et al 1991;Knutsson 1968;Leibundgut, Seibert 2011;Jakimavičiūtė-Maselienė, Cidzikienė 2016). The tracer experiments may provide crucial data parameters required for scientific studies.…”

Section: Introductionmentioning

confidence: 99%

Estimation of hydrogeological parameters of porous media in a radially convergent flow field in Kairėnai polygon, SE Lithuania

Jakimavičiūtė-Maselienė

Samalavičius

Ašipauskaitė³

et al. 2022

Baltica

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In this study, a salt-tracer method applicability in Quaternary aquifer system groundwater was tested. The tracer experiment was performed in Vilnius University Kairėnai polygon for hydrogeological investigations in 2021. In Lithuania, experiments with tracers are not prevalent. Therefore, this work describes the practical use of the tracer for the analysis of the hydrogeological environment, a methodology that enables experiments with salt tracers. After the tracer test, the water flow rate was calculated at the time of the peak concentration of Cl-, which reached 9.41 m/d. The effective porosity value was calculated manually (0.16) and using TRAC code (0.1389 and 0.1341; normalized for background values). The main results of tracer experiments show that sodium chloride solution is effective as a tracer in the Quaternary aquifer system of Lithuania for actual nef calculation, where aquifer hydraulic conductivity values are similar to the studied area. Tracer peak analysis performed in this study confirms a possibility of estimating the heterogeneity of aquifer nef on site.

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The stability of some metal EDTA, DTPA and DOTA complexes: Application as tracers in groundwater studies

Byegård

Skarnemark

Skålberg

1999

J Radioanal Nucl Chem

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Tracers for Ground Water Investigations

Cited by 7 publications

References 17 publications

Electrical conductivity as an indicator of iron reduction rates in abiotic and biotic systems

Electrical conductivity as an indicator of iron reduction rates in abiotic and biotic systems

Estimation of hydrogeological parameters of porous media in a radially convergent flow field in Kairėnai polygon, SE Lithuania

The stability of some metal EDTA, DTPA and DOTA complexes: Application as tracers in groundwater studies

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