Acta Facultatis Ecologiae - Technická univerzita vo Zvolene

100times, the content of As even 355 times.The samples of sediment load no. 4, 8, 10, 11and 13 were not picked-up. The remaining 7 samplesof sediment load (no. 5, 6, 9, 12, 14, 15, 16)taken from the bottom of the River Slaná and thebed of the brook of Muráň on different localitiesshowed concentrations of the selected elementslargely similar to the TV. Only the contents of theelements Ni in samples no. 6, 9 and 13 and Sb insamples no. 9 and 13 exceeded the MPC value. Thecontent of the selected elements in those 7 sampleswas deeply under the limit IV.A high level of contamination of sediment loadby the selected elements exceeding the limit MPCvalues as well as the IV is according to Tab. 3 and4 shown especially in the sediment load of the waterreservoir of this basin and in the deposits in theleft outflow drain from the sludge basin of NižnáSlaná.CONCLUSIONThe results of analyses of the water and sedimentload (bottom deposits) samples, picked up inthe selected localities, influenced by old and presentmining activities and their assessment maystate the following:– The outflow of mining waters from old miningworks in the basin of the River Slaná, especiallythe outflow from the Mária mine and theoutflow from the old sludge “Čučma“ in Rožňavamay have a negative impact on the level ofwater contamination in the River Slaná in caseof minimum flow rates by several selected elements.However, after flowing to the River Slanáand mixing with its water the analyses of thesamples procured have shown that the contentof the selected elements was on the level thatis in accordance with the valid requirements forthe quality of the surface water.– Analyses of samples of water from the outflowof the left toe drain and from the surface of theactive sludge basin of Nižná Slaná have shownthat this sludge basin may also have a negativeimpact on the content of several elements in thewater of the River Slaná, especially in case ofminimum flow rates.– However, the samples of sediment load (bottomdeposits) procured in the same localities as thesamples of water that were thanks to their granulometrysuitable for the chemical analysishave shown that almost all analysed sampleshave the content of the selected elements closeto the level of the TV of the valid standard forthe environment or they slightly exceed it. It istrue especially for the content of Hg from thelocality of Vlčia Dolina – brook up to the riverof Slaná in Nižná Slaná,– almost two thirds of elements from the majorityof localities exceed the value of the maximumpermitted concentration – MPC,– elements Co, Ni, Sb, Cr in the monitored localitiesof water reservoirs and in the left toe drainof the sludge basin of Nižná Slaná significantlyexceed the intervention value – IV of the validstandard for the environment,– keeping of water in water reservoirs contributesto the increase of the contents of selected elementsin the sediment load (bottom deposits).Monitoring of contamination of water and sedimentload in the selected profiles in the basin ofSlaná as well as Hnilec need to be continued bysampling and analysing of samples.AcknowledgementsThis work was supported by the Slovak GrantAgency for Science VEGA grant No. 2/7045/27and the Slovak Research and Development Agencyunder the contract No. APVV-51-027705.REFERENCES1. BOLDIŠ, M., ŠTEFANČA, P.: European iron road,Gemer the iron heart of central Europe. Projectwas realized with the financial contribution of CBCPhare. Publisher – Regional agency for development– Rožňava.2. Governmental Regulation of SR No. 296/2005 Coll.,Annex No.13. LUKÁČ, S.: Row material base and state of mineand processing equipment in works Siderit NižnáSlaná. Acta Montanistica Slovaca. Vol. 7 (2002), No.4, pp. 227–230.4. The waterworks Dobšiná. Purpose publication – PovodieBodrogu a Hornádu Košice. August 1993.5. Methodical Instruction of the Ministry of Environmentof the Slovak Republic No.549/1998-2.