Soil trace elements in area of final solid urban residue disposals

Abstract

The trace elements can be present in the soil due to natural causes as well as by anthropogenic additions, being the last one worrying, bearing in mind that they cannot be degraded, being accumulated in the environment. Studies indicate high levels of trace elements in areas of final solid urban residue (SUR) disposals, but this does not always occur. This way, this project aimed to verify if the SUR disposal in the city of Pontes e Lacerda/MT, altered the local soil quality, analyzing the fertility attributes and the levels of trace elements As, Ba, Co, Cu, Cr, Cd, Hg, Mo, Ni, Pb, Sb, Se and Zn. Soil gatherings in the active final SUR disposals and in areas of native vegetation were made, totalizing 20 samples in the depth of 0-0,20 m. Alterations in chemical attributes were verified, especially with active and potential acidity, which were lower in the active area of final SUR disposal. The saturation per bases and K levels were more elevated in the active areas of final SUR disposals. The levels of As were higher in the native vegetation area. The levels of Cd, Hg, Sb and As were higher, including in the native vegetation area, this way, it is recommended that it be conducted new studies for a confirmation of these results and mainly to estabilish background values (VRQ) for local area. Levels were observed above the Value of Prevention (VP) established by CONAMA Resolution 420/2009 for the As, Cd, Cu and Hg in the studied areas, including the native vegetation areas.