Contamination by Cr, Cu, Pb and Fe in the sediments of Capivara-Imperatriz, MA, Water Resource, Brazil
DOI:
https://doi.org/10.6008/CBPC2179-6858.2020.003.0009Keywords:
Geochemical fractions, Sequential extraction, UrbanizationAbstract
Sediments due their ability to retain and accumulate metals can reflect water quality and registre the effects of anthropogenic emissions. The study aimed to determine the concentration of Fe (II), Cu (II), Cr (VI), and Pb (II) in the geochemical fractions of the Riacho Capivara sediments, in the city of Imperatriz/MA through sequential extraction in order to evaluate the availability, the distribution mechanisms of the metallic species in the sediments and obtain information about the influence of urbanization in the degradation process of this water body. The sediments were collected at two sampling points. The different chemical forms in which metals can be associated with sediments were carried out by sequential extraction according to the methodology proposed by ‘Europan Communites Bareau of Reference’ (BCR) which consists of submitting the sample in four sequential steps (exchangeable, oxide phase the Fe and Mn, organic matter and residual fase). The concentration of the metal species was determined by Flame Atomic Absorption Spectrometry (FASS), with a background corrector with a deuterium lamp. The fractionation studies indicated that the metallic species Cu, Cr and Fe at the point within the urban perimeter were found in the available or labile or labile fraction. Pb was found in residual fraction both at sample points and Fe at the point and Fe at the point outside the urban perimeter indicating low availability in the water body. The results obtained allowed to conclude that the sedimentes of the Riacho Capivara suffer interference from the urban environment. The sequence of availability of the studies metals was Cu > Cr > Pb > Fe at the point outside the urban perimeter and Cu > Fe > Cr > Pb at the point the urban perimeter. The variation for Geochemical Index and Environmental Risck Factor probably reflect the complexity of the deteriration pictures of these water bodies, marked by the intermitente discharge of sanitary waste and by the silting and erosion of the soil observed along the investigates path.
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