| Summary: | 碩士 === 國立清華大學 === 原子科學系 === 89 === Abstract
In view that the variety and concentration of toxic materials are increasing, USEPA has launched regulations of 84 promulgated volatile organic compounds (VOCs) in water. However, some compounds used by hi-tech industries are still not included in these regulations. Therefore, a purge and trap system coupled with GC/MS as described in Method 524.2 Revision 4.0 was applied to probe 84 VOCs. In addition, a solid-phase microextraction coupled with GC/FID was built to analyze organic solvents commonly used in hi-tech industries, including IPA, Acetone, PGMEA, BA, EA, MEK, MIBK, and EL. Moreover, the comparison was also employed by the impinger coupled with cryogenic condensation-thermal desorption system.
Results from different analytical systems were integrated to study the distribution of specific pollutants in the environment. The P&T/GC/MS system developed in the present study could precisely measure 84 VOCs, with RRF values below 11% and recoveries in the range of 78-147%. The SPME/GC/FID system, after parameter-optimization, exhibited good linearity in the calibration curve (R2 0.995, the standard value) and recoveries above 75%. The results from the impinger coupled with thermal desorption system were not as good as the other two methods.
The real samples were collected from a wastewater treatment plant of the hi-tech industries and the surroundings of its effluents. The results showed that acetone and DMS were the dominant pollutants. With the establishment of various analytical systems, the ultimate goals of this study are to conduct advanced analysis and regulations of VOCs and to decrease contamination of seriously-polluted waters.
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