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DOI: https://doi.org/10.4491/eer.2019.130
In situ measurement-based partitioning behavior of perfluoroalkyl acids in the atmosphere
Seung-Kyu Kim1,2, Donghao Li3, and Kurunthachalam Kannan4
1Department of Marine Science, College of Natural Sciences, Incheon National University, Incheon 22012, Republic of Korea
2Research Institute of Basic Sciences, Incheon National University, Incheon 22012, Republic of Korea
3Key Laboratory of Nature Resource of the Changbai Mountain and Functional Molecular, Yanbian Univeristy, Ministry of Education, Park Road 977, Yanji City, Jilin Province 13302, China
4Wadsworth Center, New York State Department of Health, and Department of Environmental Health Sciences, School of Public Health, State University of New York at Albany, New York 12201, United States
Corresponding Author: Seung-Kyu Kim ,Tel: +82-32-835-8862, Fax: +82-32-835-0806, Email: skkim@incheon.ac.kr
Received: March 30, 2019;  Accepted: April 23, 2019.
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ABSTRACT
Environmental fate of ionizable organic pollutants such as perfluoroalkyl acids (PFAAs) are of increasing interest but has not been well understood because of uncertain values for parameters related with atmospheric interphase partitioning behavior. In the present study, not only the values for air-water partition coefficient (KAW) and dissociation constant (pKa) of PFAAs were induced by adjusting to in situ measurements of air-water distribution coefficient between vapor phase and rainwater but also gas-particle partition coefficients were also estimated using three-phase partitioning model of ionizable organic pollutants, in situ measurements of PFAAs in aerosol and air vapor phase, and obtained parameter values. The pKa values of PFAAs we obtained were close to the minimum values suggested in literature except for perfluorooctane sulfonic acids, and COSMOtherm-modeled KAW values were assessed to more appropriate among suggested values. When applying parameter values we obtained, it was predicted that air particle-associated fate and transport of PFAAs could be negligible and PFAAs could distribute ubiquitously along the transection from urban to rural region by pH-dependent phase transfer in air. Our study is expected to have some implications in prediction of the environmental redistribution of other ionizable organic compounds
Keywords: Acidity | Fog | Inter-phase distribution | Ioniable organic pollutants | PFAAs | pKa
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