Distribution of Metal Pollution in Groundwater Determined from Sump Sludges in Wells

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Abstract
Sludge material from the bottom of ground water sampling wells was investigated at a site near an infiltrating river in order to obtain information about the areal distribution and the partitioning of metals between sediments and interstitial waters. The concentrations of the dissolved metals in the interstitial water fluctuated more from well to well than the metal concentrations in the sludge sediments. The concentrations of most of the investigated heavy metal trace elements decreased with increasing grain sizes indicating their sorption from solution. A correlation was found between the concentration pattern at different grain size fractions and the organic carbon and the manganese content of the sediments. Some of the metals exhibited higher concentrations in the near field of the river than in the far field. This points to the river as a source for these metals. The physico-chemical conditions in the sludges are different from those in the aquifer with its flowing ground water.

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