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Time-weighted average sampling of airborne n-valeraldehyde by a solid-phase microextration device.
1Department of Occupational Safety and Health & Institute of Environmental Medicine, China Medical College, Taichung, Taiwan. shihwei@mail.cmc.edu.tw
Journal of Chromatography. A
|June 13, 2002
Summary
A modified solid-phase microextraction (SPME) device effectively samples n-valeraldehyde as a passive sampler. This method is reliable for measuring airborne concentrations, crucial for occupational exposure assessments.
Area of Science:
- Environmental Chemistry
- Analytical Chemistry
- Occupational Health
Background:
- N-valeraldehyde is an airborne chemical requiring accurate exposure monitoring.
- Traditional sampling methods can be cumbersome for passive, time-weighted average measurements.
Purpose of the Study:
- To develop and validate a modified solid-phase microextraction (SPME) device as a passive sampler for n-valeraldehyde.
- To optimize sampling and analysis parameters for accurate n-valeraldehyde quantification.
Main Methods:
- Modification of an SPME device with a poly(dimethylsiloxane)-divinylbenzene fiber coated with O-2,3,4,5,6-(pentafluorobenzyl)hydroxylamine hydrochloride (PFBHA).
- Generation of n-valeraldehyde vapors at various concentrations and relative humidities using a dynamic system.
- Analysis of collected samples using gas chromatography with flame ionization detection.
Main Results:
- Optimized adsorption time for PFBHA coating was 2 minutes.
- Optimized desorption time for the formed oxime was 2 minutes.
- Experimental sampling constant determined as (3.86+/-0.13) x 10(-2) cm3/min, independent of face velocity.
Conclusions:
- The modified SPME device functions effectively as a passive time-weighted average sampler for n-valeraldehyde.
- The method demonstrates robustness and is suitable for occupational exposure monitoring.
- Further validation could support its use in diverse environmental conditions.