Agricultural and Biosystems Engineering Publications
Campus Units
Agricultural and Biosystems Engineering, Civil, Construction and Environmental Engineering, Food Science and Human Nutrition, Toxicology
Document Type
Article
Publication Version
Published Version
Publication Date
10-23-2018
Journal or Book Title
Molecules
Volume
23
Issue
11
First Page
2736
Research Focus Area(s)
Animal Production Systems Engineering
DOI
10.3390/molecules23112736
Abstract
Determination of time-weighted average (TWA) concentrations of volatile organic compounds (VOCs) in air using solid-phase microextraction (SPME) is advantageous over other sampling techniques, but is often characterized by insufficient accuracies, particularly at longer sampling times. Experimental investigation of this issue and disclosing the origin of the problem is problematic and often not practically feasible due to high uncertainties. This research is aimed at developing the model of the TWA extraction process and optimization of TWA air sampling by SPME using finite element analysis software (COMSOL Multiphysics, Burlington, MA, USA). It was established that sampling by porous SPME coatings with high affinity to analytes is affected by slow diffusion of analytes inside the coating, an increase of their concentrations in the air near the fiber tip due to equilibration, and eventual lower sampling rate. The increase of a fiber retraction depth (Z) resulted in better recoveries. Sampling of studied VOCs using 23 ga Carboxen/polydimethylsiloxane (Car/PDMS) assembly at maximum possible Z (40 mm) was proven to provide more accurate results. Alternative sampling configuration based on 78.5 × 0.75 mm internal diameter SPME liner was proven to provide similar accuracy at improved detection limits. Its modification with the decreased internal diameter from the sampling side should provide even better recoveries. The results obtained can be used to develop a more accurate analytical method for determination of TWA concentrations of VOCs in air using SPME. The developed model can be used to simulate sampling of other environments (process gases, water) by retracted SPME fibers.
Access
Open
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License.
Copyright Owner
The Authors
Copyright Date
2018
Language
en
File Format
application/pdf
Recommended Citation
Kenessov, Bulat; Koziel, Jacek A.; Baimatova, Nassiba; Demyanenko, Olga P.; and Derbissalin, Miras, "Optimization of Time-Weighted Average Air Sampling by Solid-Phase Microextraction Fibers Using Finite Element Analysis Software" (2018). Agricultural and Biosystems Engineering Publications. 955.
https://lib.dr.iastate.edu/abe_eng_pubs/955
Included in
Agriculture Commons, Bioresource and Agricultural Engineering Commons, Toxicology Commons
Comments
This article is published as Kenessov, Bulat, Jacek A. Koziel, Nassiba Baimatova, Olga P. Demyanenko, and Miras Derbissalin. "Optimization of Time-Weighted Average Air Sampling by Solid-Phase Microextraction Fibers Using Finite Element Analysis Software." Molecules 23, no. 11 (2018): 2736. DOI: 10.3390/molecules23112736. Posted with permission.