Passive Air Sampling for Ozone by Solid Phase Microextraction
Date Issued
2007
Date
2007
Author(s)
Lee, I-Su
DOI
en-US
Abstract
Ozone is one of the major air pollutants and exposure to ozone might cause severe health effects, such as cough, asthma, headache, and lung diseases. To assess the exposures of ozone, several personal passive samplers are currently available. However, solvent desorption is commonly needed for the techniques which make the methods not very convenient. On the other hand, solid phase microextraciton (SPME) presents many advantages over conventional methods by combining sampling, preconcentration, and direct transfer of the analytes into a standard gas chromatograph (GC) system. Therefore, the purpose of this research was to develop a personal passive sampler for ozone based on the technique of SPME. Known concentrations of ozone were generated by the calibrated ozone generator in an exposure chamber. The poly(dimethylsiloxane)/divinylbenzene (PDBM/DVB) fiber was selected and 1,2-di-(4-pyridyl)ethylene (DPE) was first loaded onto the fiber. After exposures of ozone, pyriden-4-aldehyde was formed on the fiber and further headspace extraction of O-(2,3,4,5,6-Pentafluorobenzyl)-hydroxylamine hydrochloride (PFBHA) was then followed for the on-fiber derivatization. The derivatives, oximes, were then determined by portable gas chromatography/electron capture detection (portable GC/ECD) by directly inserting the SPME fibers into its injection port for thermal desorption and analysis. The desorption efficiency was found to be 100% when the time for thermal desorption time was 7 minutes while the experimental sampling rate was found to be 9.80×10-5±6.47×10-6 cm3/sec with detection limit of 120 ppb per hour.
Other than the procedure mentioned above coating of PFBHA onto the fiber for the preparation of sampler before ozone exposure was also performed in the study. The results showed that the experimental sampling rate was 1.10×10-4±0.053×10-4 cm3/sec with detection limit of 30 ppb per hour.
Compared with other methods, the current designed sampler provides a convenient and sensitive tool for the exposure assessments of ozone. More studies will be needed in the future to evaluate the possible effects of environmental factors on the designed sampler.
Subjects
臭氧
DPE
PFBHA
固相微萃取
被動式採樣
Ozone
SPME
Passive sampler
Type
thesis
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