Dumitru Giani ApostoL, Cristina Costache, Szabolcs Lanyi<br>Kinetic Study of Zinc Retention onto a River Sediment

Dumitru Giani ApostoL, Cristina Costache, Szabolcs Lanyi
Kinetic Study of Zinc Retention onto a River Sediment

Abstract:

Heavy metals discharges in water bodies pose a significant threat to the aquatic ecosystems and human health. Small doses of zinc have an important metabolic role, but overdoses may pose toxic effects onto the aquatic wildlife. Sediments in water bodies act as metals accumulators and food source for the benthic biota. The role of sediments in the bio-geochemical cycles of zinc in water bodies is partially known. In this paper a kinetic study of zinc retention onto a sediment core sampled from Arges river (nearby Crivina, Giurgiu County) is presented. The study was done in order to develop a chemodynamic model of zinc dispersion into a river stream. Based on the experimental results, as variation of concentration in time, and in order to assess the zinc retention rates, the pseudo-1st order, pseudo-2nd order and Elovich models were used. The calculations show that Elovich model has the best applicability. Based on these data, it was drawn up a mathematic correlation between retention rate and zinc concentration in the aqueous phase and sediment, based on a first order Langmuir kinetic model. The calculation results shown that the model can be successfully used to describe the kinetics of zinc retention on the chosen sediment. Keywords: kinetics, Langmuir, sediment, sorption, zinc

Issue: 2016, Volume 67, Issue 11

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This article is published under the Creative Commons Attribution 4.0 International License

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