Aqueous Biphasic Systems Composed of Random Ethylene/Propylene Oxide Copolymers, Choline Acetate, and Water for Triazine-Based Herbicide Partitioning Study. Issue 6 (19th September 2018)

• Record Type: Journal Article
• Authors: Tian, Hongzhe; Berton, Paula; Rogers, Robin D.
• Is Part Of: Solvent extraction and ion exchange. Volume 36:Issue 6(2018)
• Page Start: 602
• Page End: 616
• Publication Date: 2018-09-19
• Subjects: Aqueous biphasic system -- liquid–liquid extraction -- partition coefficient -- triazine-based herbicides -- simazine -- cyanazine -- atrazine; Solvent extraction -- Periodicals; Ion exchange -- Periodicals; 660.284248
• DOI: 10.1080/07366299.2018.1546800
• Languages: English
• ISSNs: 0736-6299

Abstract

ABSTRACT: Aqueous biphasic systems comprising ethylene/propylene oxide copolymer (EOPO-2500) and choline acetate ([Cho][OAc]) were used for extraction of three herbicides (simazine, cyanazine, and atrazine) from aqueous samples. The influence of phase composition and temperature on phase separation as measured by tie-line lengths (TLLs) and thus, on the partition coefficient ( K ), of the herbicides was investigated. The herbicides preferred the EOPO-rich phase. The partition coefficients decreased with higher concentrations of EOPO-2500 and [Cho][OAc] and with increasing temperatures (i.e., K decreases with higher TLLs). The proposed system was more environment-friendly and fast compared to traditional liquid–liquid extraction, considering that no organic solvent was consumed.