Szukana fraza: [Abstract = "The investigations, carried out while fertilising the land with the sludge, have revealed a considerable increase in the concentration of some ions as well as an inconsiderable in pH of groundwater. The authors noticed also the decrease in the concentration of heavy metals ions that may be caused by the improvement in sorption features of the ground and reduction of mobility of heavy metals ions because of precipitation. Little thickness of an unsaturated zone \(8.8 m.\) is not effective protection against the infiltration or the pollution from the surface. The time of the vertical infiltration into the aquifer has been estimated at t = l4.4 days."]

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