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Sustainability 2018, 10(11), 4105; https://doi.org/10.3390/su10114105

Assessment of Heavy Metals and Color as Indicators of Contamination in Street Dust of a City in SE Spain: Influence of Traffic Intensity and Sampling Location

1
Department of Agricultural Chemistry, Geology and Pedology, Faculty of Chemistry, University of Murcia, 30100 Murcia, Spain
2
Soil and Water Conservation Research Group, CEBAS-CSIC, 30100 Murcia, Spain
3
University Laboratory of Environmental Geophysics (LUGA), Center for Research in Environmental Geography, National Autonomous University of Mexico, 58190 Morelia, Mexico
*
Authors to whom correspondence should be addressed.
Received: 13 September 2018 / Revised: 24 October 2018 / Accepted: 1 November 2018 / Published: 8 November 2018
(This article belongs to the Special Issue Sustainable Management of Heavy Metals)
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Abstract

In the present work, a sampling grid of the urban core of the city of Murcia (South East Spain) was designed in order to analyze street dust, focusing on the contents of the heavy metals Cd, Cr, Cu, Ni, Pb, and Zn and their relationships with the color of the sample, the traffic pattern, and the location where they were sampled (sidewalks, ledges, and roads). The characterization of the samples was carried out by X-ray diffraction and scanning electron microscopy, whereas the heavy metals were extracted by acid digestion and determined by inductively coupled plasma mass spectrometry. The concentration (mg/kg) in urban dust of the city of Murcia was highest for Zn (653), followed by Cu (201) > Pb (177) > Cr (117) > Ni (51) >> Cd (0.5). The color expounded statistically significant differences with regard to the heavy metals, including the pollutant load. The same pattern was found when the classification variable was the traffic intensity, except in the case of Ni. The areas with a higher risk of contamination by heavy metals in the urban dust are the ledges of narrow city center streets with moderate traffic, where Zn and Pb seem to accumulate most greatly. View Full-Text
Keywords: street dust; urban dust; heavy metal; urban contamination; urban pollution; traffic intensity street dust; urban dust; heavy metal; urban contamination; urban pollution; traffic intensity
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Marín Sanleandro, P.; Sánchez Navarro, A.; Díaz-Pereira, E.; Bautista Zuñiga, F.; Romero Muñoz, M.; Delgado Iniesta, M.J. Assessment of Heavy Metals and Color as Indicators of Contamination in Street Dust of a City in SE Spain: Influence of Traffic Intensity and Sampling Location. Sustainability 2018, 10, 4105.

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