Scholarly record
STUDY OF CHANGES IN HYDROGEN CONCENTRATION IN SOIL GAS SAMPLES
Abstract
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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References11
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