Abstract
Studying the concentration distribution of metals is necessary for soil pollution monitoring and maintaining environmental quality. To date, very little large-scale research has been performed to investigate metal contamination in developing countries. In this study, the content and spatial distributions of five metals (cadmium [Cd], copper [Cu], nickel [Ni], lead [Pb], and zinc [Zn]) were quantified based on 346 topsoil samples from 12 districts in the province of Golestan (northeast [NE] Iran). The concentration levels (mg/kg) of Cd, Cu, Pb, Ni and Zn varied from 0.02 to 0.36, 9.3 to 93.7, 6.8 to 44, 9.5 to 85.35, and 25 to 417.4, respectively. The average concentrations (mg/kg) obtained were as follows: Cd 0.12 ± 0.07, Cu 23.9 ± 9.07, Ni 34.88 ± 11.59, Pb 15.42 ± 5.81 and Zn 82.08 ± 30.87. Significant differences in the distribution of trace elements among districts were detected. The AzadShahr and BandarGaz districts displayed the highest metal concentrations. Greater metal values were obtained in the central, south, west, and NE areas, although Zn concentration was also high to the north of the province. Values of contamination factor and contamination degree indicated that the metal pollution level was on the order of Zn > Cd > Pb > Cu > Ni and that all of the metals belonged to a low or moderate pollution category. Ni and Cu levels derived from natural sources, whereas Cd, Pb, and Zn derived from anthropogenic activities with greater mean concentrations than reference concentrations.
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Acknowledgments
This research was financially supported by the EPA of the Islamic Republic of Iran and in part by the University of Kashan Research Council (Grant No. 255802/1), to whom we are indebted. We appreciate all of the colleagues who collected and analysed soil samples and data, especially H. Yusefzadeh for statistical comments and F. Ghorbani for help in the chemical analyses. We are also grateful to H. Ghorbani and N. Hafezi Moghaddas for their help in the fieldwork and for data processing.
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Mirzaei, R., Esmaili-Sari, A., Hemami, M.R. et al. Levels and Variability of Metals in Soils of the Province of Golestan (Iran). Arch Environ Contam Toxicol 67, 617–629 (2014). https://doi.org/10.1007/s00244-014-0043-5
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DOI: https://doi.org/10.1007/s00244-014-0043-5