Evaluation of heavy metals pollution and qualitative zonation Sediment of Ghareh Su river using the indicators of ecological and geochemical risk assessment of molars

Document Type : Research Paper


1 Assistant Professor, Faculty of Natural Resources and Environmental Science, Malayer University, Malayer

2 Ph.D. student of Environmental Evaluation, Faculty of Natural Resources and Environmental Science, Malayer University, Malayer


In aquatic ecosystems, sediments are much better than the water column in representing the status of the environment. In this study; sediments in Ghareh Su River were sampled to investigate the contamination of heavy metals. After acidic digestion of the samples, elements concentration was measured by atomic absorption spectroscopy and using ecological risk assessment index, geochemical index of the molar, zoning and statistical analysis, pollution of heavy metals in Ghareh Su River were evaluated. The results of Muller geochemical index indicated that river sediments in terms of zinc, lead and chromium pollution falls into in non-polluted class and in terms of copper pollution with pollution degree 1, fall into non-polluted to moderate pollution class. The ecological risk index indicates that river falls into ecological risk category in terms of heavy metal pollution. Among heavy metals studied there is a possibility of copper and lead pollution in region. Finally, according to the Duncan test results, according to the zoning map by interpolation of layers using two methods of cokriging and kriging, and hot spot analysis of each of the studied elements, eastern part was identified as the most polluted part. Hence there is urgent need to more specific to control pollution


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  • Receive Date: 28 November 2017
  • Revise Date: 16 May 2018
  • Accept Date: 15 September 2018
  • First Publish Date: 13 May 2019