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Title: STUDY OF CHANGES IN HYDROGEN CONCENTRATION IN SOIL GAS SAMPLES
STUDY OF CHANGES IN HYDROGEN CONCENTRATION IN SOIL GAS SAMPLES

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Paulina Kopera; Anna Twarog; Henryk Sechman
10.5593/sgem2024/4.1/s17.27
10.5593/sgem2024/4.1
1314-2704
978-619-7603-71-2
English
24
4.1
•    Prof. DSc. Oleksandr Trofymchuk, UKRAINE 
•    Prof. Dr. hab. oec. Baiba Rivza, LATVIA
17.Renewable Energy Sources and Clean Technologies
Hydrogen can originate from various geological processes and its ability to migrate to near-surface layers makes soil gas analysis crucial for identifying subsurface accumulations. Current methods using portable analysers are often insufficient for precise determination, highlighting the need for gas chromatography in controlled laboratory settings. Hydrogen's high mobility and chemical reactivity make it difficult to maintain stable soil gas samples from collection to analysis. To address this challenge, an experiment was conducted to assess the impact of storage time and conditions on hydrogen concentrations in field-collected soil gas samples.
The study involved the preparation of four mixtures of hydrogen with synthetic air. Obtained hydrogen concentrations were: 47.5 ppm (M1), 93.2 ppm (M2), 15477.9 ppm (M3), 2105.6 ppm(M4). Samples were stored in glass bottles with saturated NaCl solution and in Tedlar bags at room temperature and refrigerated conditions. Hydrogen concentrations was measured on the day the test material was prepared (t0), two weeks later (t1), one month later (t2) and two months after t0 (t3) using an Agilent 7820A gas chromatograph.
The findings demonstrated that glass bottles at room temperature provided the most stable environment, with minimal concentration variation. Refrigerated samples showed increased variability, likely due to temperature-dependent solubility changes. Tedlar bags exhibited rapid hydrogen loss, attributed to the material’s permeability. For accurate hydrogen determination, glass containers at room temperature are recommended, with optimal analysis occurring within two weeks (and a month a most) of sample collection. During this period, hydrogen concentrations undergo minimal changes, which are within the analytical error of the instrument.
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The research project was supported by program "Excellence initiative – research university" IDUB for the AGH University of Krakow (project number 6237).
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https://doi.org/10.5593/sgem2024/4.1/s17.27
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Proceedings of 24th International Multidisciplinary Scientific GeoConference SGEM 2024
24th International Multidisciplinary Scientific GeoConference SGEM 2024, 1 - 7 July, 2024
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SWS Scholarly Society; Acad Sci Czech Republ; Latvian Acad Sci; Polish Acad Sci; Russian Acad Sci; Serbian Acad Sci and Arts; Natl Acad Sci Ukraine; Natl Acad Sci Armenia; Sci Council Japan; European Acad Sci, Arts and Letters; Acad Fine Arts Zagreb Croatia; Croatian Acad Sci and Arts; Acad Sci Moldova; Montenegrin Acad Sci and Arts; Georgian Acad Sci; Acad Fine Arts and Design Bratislava; Russian Acad Arts; Turkish Acad Sci.
205-210
1 - 7 July, 2024
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natural hydrogen, hydrogen concentration, soil gas sampling, storage stability

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