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conferenceseries.com
October 24-25, 2016 | Valencia, Spain
International Conference on
Environmental Health & Safety
Volume 4, Issue 5 (Suppl) Occup Med Health
ISSN:2329-6879 OMHA, an open access journal Environmental Health 2016
October 24-25, 2016
MEASUREMENTS OF OCTANOL–AIR PARTITION COEFFICIENTS, VAPOR PRESSURES
AND VAPORIZATION ENTHALPIES OF THE (E) AND (Z) ISOMERS OF THE 2-ETHYLHEXYL
4-METHOXYCINNAMATE AS PARAMETERS OF ENVIRONMENTAL IMPACTASSESSMENT
Malisa S. Chiapperoa
aUniversidad Nacional de Mar del Plata, Argentina
The 2-Ethylhexyl 4-methoxycinnamate, EHMC, is one of the UVB blocking agents more widely used in a variety of industrial
fields given an enormous annual consumption. Problems that arise due to the accumulation of this compound in nature should
be taken into consideration. The exposition of EHMC to the UV radiation produces isomerization in the double bond, consequently
two photoisomers can exist, as (Z) or (E).
In order to explain their atmospheric fate, it is required quantitative information regarding about their partition into atmospheric
particles, aerosols and water droplets, as well as their volatility. As is well known, the PL and KOA are useful descriptors of chemical
mobility in the atmospheric environment. All these parameters are strongly influenced by temperature.
The GC-RT technique was used in this work with the aim of determining the vapor pressure, enthalpies of vaporization and
octanol–air partition coefficient, for the BBP, DOP, E- and Z-EHMC esters. The results have showed that Z-EHMC is almost five times
more volatile than E-EHMC.
Moreover, BBP, Z-EHMC and E-EHMC can be classified as substances with a relatively low mobility since they lie within the
range of 8 < log KOA < 10 and -4 < log(P L/Pa) < -2, while DOP lies in the range of log KOA > 10 and log(P L/Pa) < -4, therefore, a
low mobility can be expected. From these parameters, their particle-bound fraction and gas–particle partition coefficient were also
derived.
Biography
Malisa S. Chiappero has completed her PhD at the age of 28 years from Universidad Nacional de Córdoba (Argentina) and postdoctoral studies from Ford Motor
Laboratories under direction of the Gustavo A. Argüello and Timothy Wallington, respectively. She is director of the LANIN Laboratories (UNMdP). She is founding
member of the Argentina Society for Science and Environmental Technology, SACyTA. She has published more than 20 papers in reputed journals.
Malisa S. Chiappero, Occup Med Health Aff 2016, 4:5 (Suppl)