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Ecological risk assessment of metals contamination in the sediment of the Bamdezh wetland, Iran

  • A. R. Vaezi
  • A. R. Karbassi
  • Sh. Valavi
  • M. R. Ganjali
Original Paper

Abstract

Present survey investigates the intensity of heavy metals pollution (Ca, Fe, Ni, Cd, Pb, Zn, AS, Hg) in the sediments of Bamdezh wetland, Iran . The main objective of the study is quantification of heavy metal pollution intensity in this wetland. Bamdezh wetland is located in about 40 km northwest of Ahvaz, Iran. This wetland is a habitat and food source for aquatic ecosystem and migratory birds, also a significant resource of income for the locals. Anthropogenic portion of the metals was determined through five-step chemical sequential extraction. The results of partition studies revealed the arrangement of anthropogenic portions for the metals as follows: Cd (86 %) > Pb (80 %) > Ni (46 %) > Zn (44 %) > Fe (24 %). The mean enrichment factor values for various metals were between minimal enrichment and extremely enrichment. The values obtained from I poll index are indicative of a broad range from unpolluted to moderately polluted to moderately to strongly polluted. All stations can be interpreted as a very high degree of contamination using C d and high degree of contamination using mCd classification. PLI ranged from 1.22 at station 3 to 1.55 at station 4. Result of cluster analysis for Zn and LOI shows that these two elements are related together by high similarity coefficient. As LOI in the environment is the index of biological activity, then Zn should have biological origin. The dendrogram also showed that a part of Ca and Ni is derived from lithogenous source as they are linked to Fe.

Keywords

Bamdezh wetland Anthropogenic proportion Sediment contamination Metal pollution 

Notes

Acknowledgments

We thank Dr. Behnoush Aminzadeh from wet chemical laboratory of Graduate Faculty of Environment (University of Tehran) for chemical analysis. We also thank Mr. Amin Bagherzadeh who assisted us in collection of samples.

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Copyright information

© Islamic Azad University (IAU) 2014

Authors and Affiliations

  • A. R. Vaezi
    • 1
  • A. R. Karbassi
    • 1
  • Sh. Valavi
    • 2
  • M. R. Ganjali
    • 3
  1. 1.Graduate Faculty of EnvironmentUniversity of TehranTehranIran
  2. 2.Department of Environmental Sciences, Faculty of EnvironmentIA UniversityAhvazIran
  3. 3.Faculty of Chemistry, Center of Excellence in ElectrochemistryUniversity of TehranTehranIran

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