Contamination Assesment of Heavy Metals in Karoon River Surface Sediments, Ahvaz City

Authors

Department Of geology, Shahid Chamran University Of Ahvaz

Abstract

     Most heavy metals have a negative impact on humans and the environment. Thus, evaluation of metals concentration in the environment allows taking measures to improve the quality of life and the environmental conditions. In order to assess Karun River sediments contamination with heavy metals, 24 samples of surface sediments (0-5 cm) were collected.Concentration of heavy metals (chromium, copper, zinc, lead, arsenic, nickel, manganese and iron) were determined by ICP-MS  methods. In order to evaluate heavy metal contamination in sediments, contamination factor (Cf) and the degree of contamination (Cd) were calculated. Sediment Quality Guidelines (SQGs) were used to determine the ecological risk of heavy metals. The metals concentrations in surface sediments varied from12.75 to 47.25ppm for Cu, 3.96 to 45.24 ppm for Pb, 30.9 to 151.7 ppm for Zn, 50.8 to 99.7 ppm for Ni,2.6 to 4.9 ppm for As,35.7 to 59.3 ppm for Cr, 382 to 493 ppm for Mn and 13200 to 20000 ppm for Fe.The results indicated that the Concentration of Ni in all sampling sites exceeded the probable effect level (PEL) and there were 92% for Cr out of all sampling sites exceeding the threshold effect level (TEL). The highest value of Cf was obtained for Zn and highest degree of contamination  for District Newsayt (station 16). Statistical analysis showed that copper, zinc, lead, are correlated with OC and probably originate  from domestic sewage and industrial waste. In contrast, chromium, nickel and arsenic, are correlated with iron and manganese,  and probably originate from natural or agricultural resources. Results indicate moderate pollution of river sediments.



Keywords

References

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