Abstract
The Haraz River flows northwards through the Iranian Alborz mountains in the central region of Mazandaran province and empties into the Caspian Sea. This area has been a rich source of minerals from times immemorial. About 45 mines (coal, limestone, sand and gravel, etc.) have been operational for the last eight decades. Towards the estuary, the river receives a discharge of industrial, agricultural and urban wastes. Eight sediment samples from the Haraz River and its main tributaries were collected and analyzed for base metals as well as Sr and Fe. The chemical partitioning of metals (Cu, Zn, As, Cd, Pb, Fe, Ni, Cr, Co and Sr) in each sample was determined in four fractions (acid-soluble, reducible, oxidizable and residual). The total content of each metal was also determined. The results showed relatively higher concentrations of Cd, As, Sr and Pb in comparison to that of shale. However, based on the chemical partitioning of metals, it is found that Pb, Co, Cd and Sr are the most mobile metals. In spite of the high As concentrations in sediments, it is not likely that this element is a major hazard for the aquatic environment, since it is found mainly in the residual fraction. Cadmium is the metal that showed the highest percentages in the acid-soluble fraction (the most labile) and the lowest in the residual fraction. However, Fe, Cr and Ni are present in the greatest percentages in the residual fraction, which implies that these metals are strongly linked to the sediments.
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Acknowledgment
The authors acknowledge the support provided by the Faculty of Environment, University of Tehran and comparative data support by the project (DOE-UTE-WPR-2) of the Department of Environment of Iran.
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Nasrabadi, T., Nabi Bidhendi, G., Karbassi, A. et al. Partitioning of metals in sediments of the Haraz River (Southern Caspian Sea basin). Environ Earth Sci 59, 1111–1117 (2010). https://doi.org/10.1007/s12665-009-0101-x
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DOI: https://doi.org/10.1007/s12665-009-0101-x