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Environ Sci Technol

Title:		Measurement and Modeling the Phase Partitioning of Organophosphate Esters Using Their Temperature-Dependent Octanol-Air Partition Coefficients and Vapor Pressures
Author(s):		Yaman B; Dumanoglu Y; Odabasi M;
Address:		"Department of Environmental Engineering, Dokuz Eylul University, Tinaztepe Campus, 35160 Buca, Izmir, Turkey"
Journal Title:		Environ Sci Technol
Year:		2020
Volume:		20200615
Issue:		13
Page Number:		8133 - 8143
DOI:		10.1021/acs.est.0c02823
ISSN/ISBN:		1520-5851 (Electronic) 0013-936X (Linking)
Abstract:		"Atmospheric concentrations of 11 organophosphate esters (OPEs) were measured in an urban area in Izmir, Turkey to explore their phase partitioning. Octanol-air partition coefficients (K(OA)) and vapor pressures (P(L)) of the OPEs were also measured as a function of temperature. Average Sigma(11)OPE gas-phase concentrations were 1.77 +/- 0.84 and 4.00 +/- 1.77 ng/m(3), while particle-phase concentrations were 1.95 +/- 0.77 and 1.15 +/- 0.36 ng/m(3) during winter and summer, respectively. TCiPP1 dominated Sigma(11)OPEs, followed by TnBP and TEP. OPE concentrations generally increased and shifted to gas-phase in the summer probably due to higher temperatures that favor partitioning to the gas-phase. Distribution between two phases covered a wide range from being primarily in gas-phase (TEP, TnBP) or particle-phase (EHDPP, TEHP, T2iPPP). Phase partitioning was also examined via four widely used models (K(OA), Soot, Steady-State, and pp-LFER). All models underestimated the majority of particle-gas partition coefficients (K(P)) especially for the compounds having higher volatilities. Estimations based on the recently reported molecular weight of organic matter in urban aerosols (MW(OM)) and activity coefficients of OPEs in octanol (xi(OCT)) determined in the present study suggested that the basic assumptions of K(OA)-based models (i.e., xi(OCT)/xi(OM) and MW(OCT)/MW(OM) = 1) are not valid"
Keywords:		*Air Pollutants/analysis Environmental Monitoring *Esters/analysis Octanols Organophosphates/analysis Temperature Turkey Vapor Pressure;
Notes:		"MedlineYaman, Baris Dumanoglu, Yetkin Odabasi, Mustafa eng 2020/06/10 Environ Sci Technol. 2020 Jul 7; 54(13):8133-8143. doi: 10.1021/acs.est.0c02823. Epub 2020 Jun 15"