Szukana fraza: [Abstract = "Concrete samples were taken from the internal walls of the well for testing. The samples were used for a microscopic analysis of their composition, using an electron microscope with an EDS attachment. Also, concrete samples from a new sewage well were tested to compare their elemental composition. Gas measurements confirmed the problem of odors, while the analysis of the elemental composition showed a significant proportion of sulphur\(from 7.53% to 42.9%\) on the surface of the well compared to the reference sample \(0%\)."]

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