Tropical climate effect on the toxic heavy metal pollutant course of road-deposited sediments
Autor: | Edgar P. Moraes, Glauber José Turolla Fernandes, Paula Rafaela Silva dos Santos, Lucio Flavio Ferreira Moreira |
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Jazyk: | angličtina |
Rok vydání: | 2019 |
Předmět: |
Wet season
Rainfall Geologic Sediments Traffic-Related Pollution 010504 meteorology & atmospheric sciences Health Toxicology and Mutagenesis Stormwater Principal component analysis 010501 environmental sciences Toxicology 01 natural sciences law.invention Rivers law Metals Heavy Tropical climate Dry season Particle Size Drainage system (agriculture) Vehicle Emissions 0105 earth and related environmental sciences Pollutant Principal Component Analysis Tropical Climate geography geography.geographical_feature_category Natal Spectrophotometry Atomic General Medicine Pollution Toxic heavy metals Environmental chemistry Road-deposited sediment Environmental science Seasons Surface runoff Atomic absorption spectroscopy Brazil Water Pollutants Chemical Environmental Monitoring |
Zdroj: | Repositório Institucional da UFRN Universidade Federal do Rio Grande do Norte (UFRN) instacron:UFRN |
Popis: | In modern society, the intense vehicle traffic and the lack of effective mitigating strategies may adversely impact freshwater systems. Road-deposited sediments (RDS) accumulate a variety of toxic substances which are transported into nature during hydrologic events, mainly affecting water bodies through stormwater runoff. The aim of this study was to evaluate the RDS metal enrichment ratio between the end of wet season and the middle of the dry season for Cd, Cr, Cu, Fe, Mn, Ni, Pb and Zn in samples from Natal, Brazil. Twenty RDS, drainage system and river sediment samples were collected in the wet and dry seasons using a stainless-steel pan, brush and spatula. In the laboratory, the samples were submitted to acid digestion and heavy metal concentrations were measured by atomic absorption spectrometry (AAS). A consistent RDS enrichment by heavy metals in dry season samples was followed by an increase in the finest particle size fraction (D < 63 mm). Maximum concentrations were 5, ND, 108, 23810, 83, ND, 77 and 150mg kg-1 for Cd, Cr, Cu, Fe, Mn, Ni, Pb and Zn, respectively. The RDS enrichment ratio was Cr(1.3 ), Cu(2.6 ), Fe(3.3 ), Mn(1.5 ), Pb(1.5 ) and Zn(2.1 ). The Geo-accumulation Index values showed that RDS were moderately polluted for Cu and slighted polluted for Zn and Pb. Principal Component Analysis (PCA) showed that the accumulation of toxic heavy metals decreased according to water flow |
Databáze: | OpenAIRE |
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