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Anthropogenic heavy metal signatures for the fast growing urban area of Natal (NE-Brazil)

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Environmental Geology

Abstract

In this study the effect of anthropogenic discharges on the heavy metal content in the Potengi–Jundiai river system near the fast growing city of Natal, NE-Brazil, is investigated. Due to the multiple anthropogenic source character without any predominating anthropogenic heavy metal discharge the area of Natal may serve as a characteristic place for the study of the impact of the fast growing Brazilian cities on the environment. In general the sediments of the Rio Potengi–Jundiai river system in the studied area are not severely polluted. However, close to waste water drain pipes a characteristic anthropogenic heavy metal signature is visible in enhanced Zn, Pb, Cu and Cd values relative to reference elements such as Al and Fe. Sources are domestic and animal waste, combustion products and hydrocarbons. These heavy metals are probably mainly bound to organic matter. The elements Sn, Hg and Ag in part also belong to the anthropogenic heavy metal signature. The elements Cr, Ni and V are characteristic of weathering heavy minerals in crystalline rocks exposed in the catchment area of the river system and are not significantly added from anthropogenic sources. These heavy metals are most likely predominantly bound to oxides and represent the pristine geogenic background of the system. They can thus be used as reference elements to monitor incipient accumulation of Zn, Pb, Cu and Cd due to anthropogenic input. The element characteristics found here match with those found in other fast growing urban areas such as the Sao Paulo metropolitan area.

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Acknowledgments

The authors wish to thank R. Neef and V. Havenith (Aachen) for valuable analytical work, and S. Prantl (Aachen) for preparation of the figures. Also, the assistance of K. Amaral and J. Vieira de Melo (Natal) for help during the sampling campaign is gratefully acknowledged. The work was possible due to funding by “Deutscher Akademischer Austauschdienst” (DAAD) to R.A. Petta and S. Sindern.

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Sindern, S., Lima, R.F.S., Schwarzbauer, J. et al. Anthropogenic heavy metal signatures for the fast growing urban area of Natal (NE-Brazil). Environ Geol 52, 731–737 (2007). https://doi.org/10.1007/s00254-006-0510-z

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  • DOI: https://doi.org/10.1007/s00254-006-0510-z

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