Title: Atmospheric gas-particle partitioning of E-EHMC and Z-EHMC estimated from their liquid vapour pressures at 298.15 K

Authors: César Nicolás Pegoraro; Hernán A. Montejano; Malisa S. Chiappero

Addresses: Departamento de Química, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Mar del Plata, Funes 3350- Nivel +2- 7600 Mar del Plata, Argentina; CONICET – CCT Mar del Plata ' Departamento de Química, Facultad de Ciencias Exactas, Físico-Químicas y Naturales, Universidad Nacional de Río Cuarto, 5800 Río Cuarto, Argentina; CONICET – Río Cuarto ' Departamento de Química, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Mar del Plata, Funes 3350- Nivel +2- 7600 Mar del Plata, Argentina; CONICET- CCT Mar del Plata

Abstract: The UVB filter E-ethylhexyl p-methoxycinnamate (E-EHMC) is extensively used as UV protectant in commercial products. Besides, it is well known that it photoisomerises into Z-EHMC. In this work, ΔvapH (Tm) and vapour pressure, P (Pa) at 298.15 K, of E-EHMC and Z-EHMC were estimated using an indirect experimental method developed in our laboratory named effusion method under atmospheric pressure (EMAP). The atmospheric particle bound fraction (Φ) and the gas-particle partition coefficient (KP) for E-EHMC and Z-EHMC were derived from the vapour pressure, P (Pa) (298.15 K), estimated by EMAP methodology.

Keywords: vapour pressure; gas-particle partition coefficient; EMAP; particle-bound fraction.

DOI: 10.1504/IJENVH.2018.090865

International Journal of Environment and Health, 2018 Vol.9 No.1, pp.66 - 83

Available online: 28 Mar 2018 *

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