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The Upper-Pontian aquifer is one of the most important in Northwest Bulgaria. It is built of sands with a thickness of up to 100 m that outcrop on the surface at the periphery of the Lom depression. The aquiferous sands are overlain by a lignite coal layer up to several meters thick. In order to assess the influence of coal on the chemical composition of groundwater, an experiment has been carried out in laboratory. In view of the leading role of rainwater, the experiments were conducted with real rainwater. This ...