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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 exper...

The paper presents the results of surface geochemical surveys carried out using "free gas method" in "Brzesko-Wojnicz" area in the SE part of the Poland. The surveys were conducted along 2 measurement profiles. A total of 341 soil gas samples were collected from 1.2 m depth below the surface. Maximum concentrations of CH4, total alkanes C2- C5, total alkenes C2-C4 reached: 27,1 vol.%., 45,3 ppm and 0,174 ppm, respectively. In total, in the analyzed area there are anomalous concentration of total C2-C5 alkanes (ove...