This study aimed to demonstrate how quickly sediments can move in the urban environment carrying concentrations of trace elements adsorbed. To achieve this goal, the concentration of trace elements (Zn, Cr, Ni, Cu, and Pb) in the street and river sediments were determined in two micro-hydrographic basins of Toledo city in the state of Paraná, Brazil. The methodology used suitable equipment for the sediments collected, and the analytical determination was performed only with sediments fractions smaller than 63 µm by inductively coupled plasma optical emission spectrometry. The results of trace element concentrations were submitted to a correlational statistical analysis, evaluating the rainfall influence in the movement of these sediments. The study concluded that trace elements are adsorbed by street's sediments and quickly carried by surface flow to the rivers that drain these areas. This process was facilitated by waterproofed surfaces. Therefore, the study showed that monitoring must be systematic to observe the mobility of trace elements in urban environments.
This study performed a multivariate analysis about the water quality of rivers that go across the urban perimeter of Toledo -PR. For this study five rivers were chosen, where the physicochemical data of the water was collected as sediment samples to determine the amounts of copper and zinc with the use of spectrometry of optical emission with inductively coupled plasma (ICP-OES). The results showed that the physicochemical parameters were influenced by the contribution of anthropic pollution and explained the desorption of copper and zinc from the river bottom sediments. The control graphs demonstrated some results outside control limits, however the most part results inside the limits do not represent the best parameters of water quality. Therefore, it was concluded that the technique used is one relevant tool to interpret the behaviour of physicochemical parameters, allowing that the quality of water of rivers may be monitored.Keywords: limits framing of water bodies; pollution in rivers; heavy metals in sediments. Analysis of urban rivers' water quality using multivariate approach 31Reference to this paper should be made as follows: Boas, M.A.V., Poleto, C., Juchen, R.T. and Juchen, C.R. (2016) 'Analysis of urban rivers' water quality using multivariate approach', Int.
This study aimed to determine the granulometric and mineralogical composition and the contents of trace elements Cr, Ni and Pb in sediments collected in impermeable streets located in the urban perimeter of Toledo PR, Brazil. The mineralogical analyses were performed by a diffractometer, the granulometric by integrated sieving methods and laser diffraction, trace elements in sediment quartered fractions by optical emission spectrometry with inductively coupled plasma (ICP-OES). It was concluded that the sediments with an average granulometric greater than 0.09 mm and finer fractions represented by the clay. The mineralogy identified ferruginous substances characteristics of Distroferric Red Latosol - DRL with high presence of quartz and diopside. Statistically it was shown that the concentrations of the trace elements in sediment samples had a significant enrichment for Chromium and Nickel in the central area’s streets and the Lead in lower concentrations in the streets of the periphery areas. The sediments have an average particle size with diameters greater than 0.09 mm, represented by sand, and the fine sediments represent 2 to 6% of samples. The software indicated that the sediments are from different anthropogenic sources. The diffractograms show peaks for quartz and diopside. The enrichment for trace elements was significant for chromium and nickel on the downtown area streets.
Abstract:This study aimed to determine the granulometric and mineralogical composition and the Cr, Ni and Pb trace element content in sediments collected from impermeable streets located in the urban perimeter of Toledo, PR, Brazil. The mineralogical analyses were performed by a diffractometer, the granulometric analyses by integrated sieving methods and laser diffraction, and the analyses of the trace elements in quartered fractions of the sediments were carried out by optical emission spectrometry with inductively coupled plasma (ICP-OES). It was concluded that the sediments had an average granulometry greater than 0.09 mm, with finer fractions represented by clay. The mineralogy identified ferruginous substances characteristic of Distroferric Red Latosol DRL, with a high presence of quartz and diopside. Statistically, it was shown that the sediment samples were significantly enriched with the trace elements Chromium and Nickel in the central area streets and with Lead in lower concentrations in the streets in the peripheral areas. The sediments have an average particle diameter greater than 0.09 mm, represented by sand, with fine sediments representing 2 to 6% of the samples. The software indicated that the sediments are from different anthropogenic sources. The diffractograms show peaks for quartz and diopside. Enrichment by trace elements was significant for chromium and nickel in the downtown area streets.
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