Distribution of Organophosphate Esters between the Gas and Particle Phase-Model Predictions vs Measured Data

Publikation: Beiträge in ZeitschriftenZeitschriftenaufsätzeForschungbegutachtet

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Gas-particle partitioning is one of the key factors that affect the environmental fate of semivolatile organic chemicals. Many organophosphate esters (OPEs) have been reported to primarily partition to particles in the atmosphere. However, because of the wide range of their physicochemical properties, it is unlikely that OPEs are mainly in the particle phase "as a class". We compared gas-particle partitioning predictions for 32 OPEs made by the commonly used OECD POV and LRTP Screening Tool ("the Tool") with the partitioning models of Junge-Pankow (J-P) and Harner-Bidleman (H-B), as well as recently measured data on OPE gas-particle partitioning. The results indicate that half of the tested OPEs partition into the gas phase. Partitioning into the gas phase seems to be determined by an octanol-air partition coefficient (log KOA) < 10 and a subcooled liquid vapor pressure (log PL) > -5 (PL in Pa), as well as the total suspended particle concentration (TSP) in the sampling area. The uncertainty of the physicochemical property data of the OPEs did not change this estimate. Furthermore, the predictions by the Tool, J-P- and H-B-models agreed with recently measured OPE gas-particle partitioning.
OriginalspracheEnglisch
ZeitschriftEnvironmental Science & Technology
Jahrgang50
Ausgabenummer13
Seiten (von - bis)6644-6651
Anzahl der Seiten8
ISSN0013-936X
DOIs
PublikationsstatusErschienen - 05.07.2016

    Fachgebiete

  • Chemie - Esters, Forecasting, Organic chemicals, Uncertainty analysis, Environmental fate, Gas-particle partitioning, Octanol air-partition, Organophosphate esters, Physicochemical property, Sampling areas, Subcooled liquid, Total suspended particles

DOI

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