Investigation of the sorption mechanism of selected organophosphorus pesticides on Danube sediment
2019
Apostolović, Tamara (https://orcid.org/0000-0002-0614-2611) | Kragulj-Isakovski, Marijana (https://orcid.org/0000-0002-6880-6735) | Maletić, Snežana (https://orcid.org/0000-0002-5026-3365) | Tričković, Jelena (https://orcid.org/0000-0001-5592-9931) | Tubić, Aleksandra (https://orcid.org/0000-0001-7503-7754) | Molnar-Jazić, Jelena (https://orcid.org/0000-0002-8696-7647) | Agbaba, Jasmina (https://orcid.org/0000-0002-9915-2885)
Sorption processes in equilibrium and non-equilibrium conditions have been thoroughly investigated over the past several years. In this paper, the sorption behaviour of two organophosphorus pesticides (chlorpyrifos-methyl and chlorfenvinphos) on Danube sediment was studied. For investigated pesticides, the retardation coefficients (Rd ) were 6.2 for chlorfenvinphos and 15.5 for chlorpyrifos-methyl. In addition, chlorpyrifos-methyl showed a significant degree of biodegradation with λ = 4.15. Batch sorption experiments are in line with column experiments and showed that Danube sediment has higher sorption capacity for chlorpyrifos-methyl than for chlorfenvinphos. Both experimental approaches showed good agreement with the hydrophobicity of the investigated compounds. However, for final conclusions, further research should be focused on a more detailed characterization of sediment as well as an investigation of a larger set of organic compounds.
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