Assessment of soil contamination in Slovakia according index of geoaccumulation | Hodnotenie kontaminácie pôd Slovenska podľa indexu geoakumulácie
2008
Šefčík, P., State geological institute of Dionýz Stur, Bratislava (Slovak Republic) | Pramuka, S., State geological institute of Dionýz Stur, Bratislava (Slovak Republic) | Gluch, A., State geological institute of Dionýz Stur, Bratislava (Slovak Republic)
The results of soil geochemical mapping of Slovak republic were used for the assessment of soil contamination by trace elements: As, Bi, Cd, Cr, Cu, Hg, Ni, Pb, Sb, Se and Zn. The geoaccumulation index (I sub (geo)) was used to quantify the degree of contamination and was calculated according to the equation: I sub (geo) = log2 (Cn/l,5xBn). Cn - measured concentration of element in sample, Bn - geochemical background value (median) was calculated from geochemical database of uncontaminated Slovakian soils. The background values of trace elements are (mg per kg): As = 6.8, Bi = 0.3, Cd = 0.2, Cr = 82.2, Cu = 18, Hg = 0.06, Ni = 26, Pb = 18, Sb = 0.5, Se = 0.2 and Zn = 60. According to the values of the I sub (geo) categories the limits of soil contamination for the elements were calculated (mg per kg): As - 31, Bi = 1.5, Cd = 0.9, Cr = 360, Cu = 80, Hg = 0.3 Ni = 120, Pb = 80, Sb = 2.2, Se = 0.9 and Zn = 265. The percentage abundance of contaminated soil samples from humus horizons is decreasing as follows: Sb more than Hg more than Cd more than As more than Pb more than Bi more than Cu more than Ni more than Zn more than Se more than Cr. The soil contamination may by derived from various sources, including weathering of natural background rocks, metal deposits and anthropogenic contamination.
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