Contamination assessment and chemical speciation of potentially toxic elements in surface sediments of the Karoon River, Ahwaz city district
Article Type:
Research/Original Article (دارای رتبه معتبر)

The present study aims to evaluate the concentration and speciation of potentially toxic elements in surface sediments of Karoon River in Ahwaz district. For these purposes, 14 surface samples were collected. The total concentration of major and trace elements was determined by an ICP-OES instrument. A five-stage sequential extraction procedure was applied to investigate the fractionation of potentially toxic elements. The pH, organic matter, carbonate content, and cation exchange capacity of the sediments vary between 7- 8.9, 0.4 to 4.9 %, and 5.4 to 12.6 meq/100 g, respectively. Geo-accumulation index values show that the studied samples are classified as non-polluted to slightly polluted sediments. The sequential extraction analysis indicates that 78 %, 77.6%, 61.8 %, 73 %, 65.8 %, 85.8 %, and 60.9% of total Cu, Pb, Cd, Zn, Ni, As, Cr content, respectively, are present in the non-residual phases; therefore, these elements are mainly from anthropogenic sources. Considering the chemical fractionation of the studied elements in the sediments of the Karoon River, Cd has the highest bioaccessibility, whereas Cu and Cr are not bioaccessible.

Stratigraphy and Sedimentology Researches, Volume:38 Issue: 2, 2023
13 to 34  
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