Using SPME-GC Technique in Propylene Glycol Ether acetate Airborne Monitoring

• Main Authors: Chia-Hui Kuo, 郭佳慧
• Other Authors: Yeh-Chung Chien
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/96245944700907969503

碩士 === 弘光科技大學 === 職業安全與防災研究所 === 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 75m 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, 21C 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 (p<0.05) affected by temperature and relative humidity, but was not (p>0.05) 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.