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Journal of Soils and Sediments

, Volume 14, Issue 7, pp 1251–1257 | Cite as

Assessment of diffuse pollution associated with metals in urban sediments using the geoaccumulation index (Igeo)

  • Leidy Luz García MartínezEmail author
  • Cristiano Poleto
PROGRESS IN EROSION AND SEDIMENTATION IN LATIN AMERICA

Abstract

Purpose

This study investigated the behavior of cadmium (Cd), lead (Pb), nickel (Ni), and zinc (Zn) in urban sediments collected in commercial, residential, and industrial areas of the city of Porto Alegre, Brazil, and evaluated different degrees of pollution in this urban subdrainage basin through the use of the geoaccumulation index (Igeo).

Materials and methods

Concentrations of Cd, Ni, Pb, and Zn were analyzed using acid digestion (EPA method 3050) in fractions <63 μm in 20 composite samples of urban sediment collected using a portable vacuum in 20 different sampling points on roads from three areas with diverse use: commercial, industrial, and residential.

Results and discussion

The values of Igeo were commercial area (3.35, Zn; 3.76, Cd; 3.60, Ni; 2.63, Pb) > residential area (3.34, Zn; 3.36, Cd; 2.94, Ni; 1.46, Pb) > industrial area (2.74, Zn; 1.78, Cd; 3.01, Ni; 1.45, Pb), indicating that the sediment was “highly contaminated” in the case of Zn and Ni, while for Cd, it was “moderately to highly contaminated,” and for Pb, it was “moderately contaminated.” The pollution is associated with traffic flow in all areas.

Conclusions

Research should be increased to make urban systems more sustainable, reducing their pollution potential and minimizing the delivery of potentially polluting particles into freshwater bodies. The Igeo allows for the determination of a simple index of diffuse pollution state associated with urban sediments.

Keywords

Diffuse pollution Enrichment indexes Urban drainage Urban sedimentology 

Notes

Acknowledgments

The authors thank the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) for the financial support, to the Conselho Nacional de Desenvolvimento Cientifico e Tecnológico (CNPq) for granting a scholarship, and to the Soil Analysis Laboratory of the Universidade Federal do Rio Grande do Sul for performing the chemical analyses.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Leidy Luz García Martínez
    • 1
    Email author
  • Cristiano Poleto
    • 2
  1. 1.IPH—UFRGSPorto AlegreBrazil
  2. 2.Universidade Tecnológica Federal do Paraná (Federal Technological University of Parana)ToledoBrazil

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