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CHANGES IN SPECIFIC ELECTROLYTIC CONDUCTIVITY OF WATER BODIES IN SUBSIDENCE BASINS IN THE SILESIAN UPLAND

Robert Machowski

Abstract

The land subsidence caused by underground mining results in the transformation of water relations in the Silesian Upland, which is located in southern Poland. Detailed studies were conducted in 25 water bodies formed in subsidence basins located on the Silesian Upland. The purpose of the study was to determine the temporal and spatial variability of electrolytic conductivity of the limnic waters retained in the water bodies studied. As part of field work, 12 specific electrical conductivity measurements were conducted using the YSI 6600 V2 multi-parameter sonde. The measurements were conducted once a month in hydrological year 2013. Laboratory tests using the 850 Professional IC ion chromatograph from Metrohm included chemical analyses of the water samples retained in the water bodies formed in subsidence basins. The tests conducted revealed considerable variation in the parameter analysed, both spatial and temporal. Average specific electrolytic conductivity values varied from 157 ?S/cm to 2785 ?S/cm, minimum values from 100 ?S/cm to 1483 ?S/cm, and the highest values measured ranged from 187 ?S/cm to 4089 ?S/cm. Water bodies functions in areas with different anthropogenic influences. The hydrochemical diversity of these water bodies is determined by the nature of their catchment areas. The significant variation in this parameter results from the different ways in which water body catchments are used; the values accurately reflect the diverse impact of human pressure on the aquatic environment of the Silesian Upland.

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DOI resolver: doi.org/10.5593/sgem2017/31/s12.011

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