Bioavailability and Concentration of Heavy Metals in the Sediments and Leaves of Grey Mangrove, <Emphasis Type="BoldItalic">Avicennia marina</Emphasis> (Forsk.) Vierh,in Sirik Azini Creek,Iran |
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| Authors: | Hossein Parvaresh Zahra Abedi Parvin Farshchi Mahmood Karami Nematullah Khorasani Abdolreza Karbassi |
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| Institution: | (1) Department of Environment and Energy, Science and Research Branch, Islamic Azad University, Tehran, Iran;(2) College of Agriculture and Natural Resources, Faculty of Natural Resources, University of Tehran, Karaj, Iran;(3) Graduate Faculty of Environment, University of Tehran, Tehran, Iran;(4) Parvaresh Alley, Daroopakhsh Street, 7915873389 Bandar Abbas, Iran |
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| Abstract: | The concentration and bioavailability of Ni, Cu, Cd, Zn, and Pb in the sediments and leaves of grey mangrove, Avicennia marina, were studied throughout Sirik Azini creek (Iran) with a view to determine heavy metals bioavailability, and two methods
were used. Results show that Zn and Ni had the highest concentrations in the sediments, while Cd and Cu were found to have
the lowest concentrations in the sediments. Compared to the mean concentrations of heavy metals in sedimentary rock (shales),
Zn and Cu showed lower concentration, possibly indicating that the origin of these heavy metals is natural. A geo-accumulation
index (I
geo) was used to determine the degree of contamination in the sediments. I
geo values for Zn, Cu, Pb, and Ni showed that there is no pollution from these metals in the study area. As heavy metal concentrations
in leaves were higher than the bioavailable fraction of metals in sediments, it follows that bioconcentration factors (leaf/bioavailable
sediment) for some metals were higher than 1. |
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