Reservoir recultivation versus forms of heavy metals in sediments: the case of the Kielce City Lake
The Kielce Lake is a water reservoir located in the Kielce city zone. Areas around the reservoir are used for recreational, residential and industrial purposes. Additionally, the nearby state road to the city of Łódź, is a source of transportation pollution, including heavy metals. The reservoir is fed by a watercourse which receives municipal wastewater from the town of Masłów near Kielce. The amount and diversity of organic and inorganic compounds which flow into the reservoir causes heavy pollution of the Lake waters. To reduce the degree of reservoir pollution, a pulverizing aerator was installed in the middle of the Kielce Lake in May 2008. Sediment samples were collected at a depth of 0–20 cm between July 2008 and May 2010 at five sites in the littoral zone of the recultivation area. These environmental samples underwent a five-stage sequential extraction procedure, assisted by microwave radiation. The concentrations of trace metals Zn, Cu, Ni, Cr, Pb, Mn, Fe and Cd in various extracts were determined by means of F-AAS and GF-AAS. The results have shown a high concentration of analytes in reservoir sediments.
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