Bioavailability and concentration of heavy metals in the sediments and leaves of grey mangrove, Avicennia marina (Forsk.) Vierh, in Sirik Azini Creek, Iran.
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 (Igeo) was used to determine the degree of contamination in the sediments. Igeo 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.
Department of Environment and Energy, Science and Research Branch, Islamic Azad University, Tehran, Iran. hossein20062001@yahoo.com
Hossein
H
Parvaresh
Zahra
Z
Abedi
Parvin
P
Farshchi
Mahmood
M
Karami
Nematullah
N
Khorasani
Abdolreza
A
Karbassi
D032407:Avicennia / Q000378:metabolism*; D004784:Environmental Monitoring; D019015:Geologic Sediments / Q000032:analysis*; D007492:Iran; D019216:Metals, Heavy / Q000032:analysis* / Q000378:metabolism*; D018515:Plant Leaves / Q000378:metabolism*
D019216:Metals, Heavy