Using SPME-GC Technique in Propylene Glycol Ether acetate Airborne Monitoring
| Autor: | Chia-Hui Kuo, 郭佳慧 |
|---|---|
| Rok vydání: | 2010 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 98 A headspace solid-phase microextraction (HS-SPME) combining capillary gas chromatography with flame ionization detection (GC-FID) for use in the determination of three frequentlly used propylene glycol ethers (PEs) at ppb level is described. A commercial 75m carboxen- polydimethylsiloxane fiber was used to extract the analytes from PEs standard gas. The factors affecting the HS-SPME extraction, such as coating material, desorption time, temperature, concentration and wind velocity etc. were discussed. The concentration ranges for calibration curves were 23 μg/ml~2.2 mg/ml for PGME, 24.3μg/ml ~2.9 mg/ml for PGMEA and 23.9 μg/ml ~2.9 mg/ml for DPGME, and the correlation coefficients were greater than 0.995. The method detection limits were 0.13 μg/ml, 0.04 μg/ml,and 0.05 μg/ml per sample for PGME, PGMEA and DPGME, respectively. The optimal desorption time was 5 min, and experimental sampling rate were (5.796± 0.581)´10-7, (5.266 ±0.429)´10-7, (5.107± 0.548) ´10-7 m3/min for PGME, PGMEA, DPGME respectively, tested under 100ppm, 21C and 10%RH. The experimental uptake rate of SPME for PGMEA was 30-50 times higher than that of the theoretical values. Such discrepancy likely results from PGMEA hydrolysis. The experimental uptake rates were significantly (p0.05) significant by wind velocity. Samples were stable for 9 days under 4°C and 7 days under room temperature. The current study demonstrated that the proposed sampler is suitable for monitoring airborne PEs and assess time-weighted average (TWA) exposures for workers. Nonetheless, future study is needed to validate the performance of the proposed method in the field. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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