Evaluation of Samplers for Toluene Diisocyanate
| Autor: | Hsi-Chen Lin, 林希貞 |
|---|---|
| Rok vydání: | 2003 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 91 This study was carried-out to compare the performance of five kinds of sampler for toluene diisocyanate (TDI), i.e. triple filter system (TFS), annular denuder system (ADS), dual filter system (DFS), open-face filter cassette (OFFC) and closed-face filter cassette (CFFC). Laboratory tests showed that there was no obvious difference between two relative humidities with different media. Further, it can say that the lon-ger the sampling time, the faster the concentration of 2,4-TDI decreased. The loss rate of TDI during the chamber runs followed first order decay behavior. The field comparison study was carried-out in a polyurethane foam factory situ-ated in Taichung, Taiwan during September to October 2002. Sampling was perform-ed at different time intervals to study the time effect on sampling concentrations. The results show that the concentrations of total TDI estimated by the TFS are comparable to those by the ADS and other filter systems. The comparison with ADS shows that TFS works well with 15-min sampling period, which is the standard duration for TDI sampling. The test data prove the reliability of TFS in the field sampling of TDI. It is a convenient system for the simultaneous sampling of vapor- and aerosol-phase TDI, and derivatives of other isocyanates |
| Databáze: | Networked Digital Library of Theses & Dissertations |
| Externí odkaz: |
|