Kinetic determination of high partition coefficients using diffusion in the boundary layer

Escher, Beate I, Ha, Yeon-Jeong and Kwon, Jung-Hwan (2010). Kinetic determination of high partition coefficients using diffusion in the boundary layer. In: SETAC Asia Pacific 2010 Meeting, Guangzhou, China, (). 4-7 June 2010.

Author Escher, Beate I
Ha, Yeon-Jeong
Kwon, Jung-Hwan
Title of paper Kinetic determination of high partition coefficients using diffusion in the boundary layer
Conference name SETAC Asia Pacific 2010 Meeting
Conference location Guangzhou, China
Conference dates 4-7 June 2010
Publication Year 2010
Year available 2010
Sub-type Oral presentation
Abstract/Summary Partition coefficients (K) are overwhelmingly used in environmental sciences and engineering to characterize the fate of pollutants in the natural and engineered environment. However, experimental determination of partition coefficients between two phases becomes very difficult as the absolute value increases. Time required for the determination of K increases exponentially as log K increases linearly if we determine K at equilibrium between two phases, resulting many potential experimental artefacts. Thus, an innovative method using the diffusion in the boundary layer has been developed to measure partition coefficients between two phases. According to the theory of the diffusion in the boundary layer, the rate of diffusive mass transfer is determined by diffusion coefficient, the thickness of the boundary layer of a fluidic medium, and partition coefficient between the two phases. Because diffusion coefficients in a well-characterized medium such as air and water can be predicted and the thickness of the boundary layer is a dynamic property of the medium, partition coefficient can be directly related with experimentally determined mass transfer coefficient. This presentation will show two successful model systems – partition coefficients between poly(dimethylsiloxane) and water (KPDMSw) and 1-octanol/air partition coefficient (Koa). Polycyclic aromatic hydrocarbons were chosen as model compounds for a proof of principle and the range of partition coefficients measured within 30 h was 103~106 for KPDMSw and 105~1010 for Koa.
Subjects 030104 Immunological and Bioassay Methods
Q-Index Code EX
Q-Index Status Provisional Code
Institutional Status Unknown
Additional Notes subject code to be verified by Prof Beate Escher. e documents available (tried to upload but failure) contact UPO for copy. D01 - oral - 16 - unable to load e-document will email to espace team listing relevant PIDS.

Document type: Conference Paper
Collection: National Research Centre for Environmental Toxicology Publications
 
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Created: Thu, 17 Feb 2011, 12:27:19 EST by Manjit Sanghera on behalf of National Res Centre For Environmental Toxicology