Published in:
01-10-2023 | Original Article
Effect of electro-photocatalytic decomposition (mainly Eh–pH) on association of metals with sedimentary phases and their mobility in the wetland ecosystem
Authors:
Fatemeh Kachoueiyan, Abdolreza Karbassi, Touraj Nasrabadi
Published in:
Environmental Earth Sciences
|
Issue 19/2023
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Abstract
Heavy metal (HM) mobility and dynamics are greatly influenced by environmental factors, such as oxidation–reduction potential, pH, and salinity. The present work used an experimental setup to evaluate the influence of oxidation conditions and Eh-dependent parameters on the mobility of HMs in the sediments of Gomishan Wetland. Our findings revealed that the rise in aquatic Eh from 109 to 487 mV enhanced the release of Co, Cd, Cr, V, Mo, and Pb, with their mobility ordered as Mo > Pb > V > Co > Cd > Cr. The Tessier sequential extraction revealed that all elements were closely correlated with their terrestrial fractions. Correspondingly, terrestrial sources accounted for about 97.9%, 97.7%, 96.8%, 95.9%, 85.8%, and 69.2% of the total concentration of V, Cr, Co, Mo, Pb, and Cd in sediments, respectively. Enrichment factor (EF) and pollution index (Ipoll) were used to assess the HMs' contamination of the sediments. EF values revealed the depletion of V, Cr, Co, Pb, and Cd to the minimal enrichment (EF < 2), whereas Mo had a significant enrichment (2 < EF < 5). Ipoll values showed that the sediments were not polluted with Co, Cr, Mo, V, and Pb (Ipoll < 0.50), while they were slightly polluted with Cd (0.50 < Ipoll < 0.89).