| Summary: | 碩士 === 崑山科技大學 === 環境工程研究所 === 96 === This research is focus on analyzing the Tedlar bag test of NIEA A734.70, published by Environmental Protection Administration, Taiwan. However, this method only focus on 24 species VOCs (C5-C10), because of considering the complex factor of discharging gas, and the compound which including high carbon. It causes the condensation on analyzing C11-C14 VOCs with the higher molecular weight, which are low evaporating for collecting the coagulation on the bag in the room temperature. Meanwhile, the method of non-extreme organic compound environmental assay never mentions the avail of cylinder technology. This research focuses on the cylinder method and verifies the avail of its assay technology and collecting the alkane, terpene, alkyne, hydrocarbon and other compounds in the pipe.
The result shows that there are the affections on cold coagulation and compound diosmose by the Tedlar Bag method to collect the extreme and non-extreme compounds. Comparing the quality control line (above 0.985), precision around ±30% and the accuracy ±25% by cylinder draw out method and NIEA A715.12B canister method. However, draw out of cylinder method focus the C5-C10
However, cylinder accuracy and precision for C5-C10 VOC analysis, R-squre between 0.985-0.996, the accuracy of 70% -135%, the precision of 2.8% -14.0%, but obviously the species of C11-C14 VOCs; R-squre of n-tridecane and n-tetradecane between 0.95-0.96, the accuracy of the C11-C14 VOCs between 53%-161%, the precision is no excess of ± 25% but as well as high In the ± 20%.
By the circulating method of cylinder, the accuracy of C5-C8 VOCs is less than ± 10%, and precision of less than ±3%, opposite the draw out of cylinder high than many. C9-C14 species the accuracy of 101%-201% and precision of ±9.42%-±16.67%. C9-C14 species change over of the higher reasons, may be due to the circulating method of cylinder sampling into the GC/FID of pressure is not to agree with more higher variation.
In addition, exhaust gas of stacks collection of detection compared by circulating and draw out of cylinder method due to sampling into methods and chemical characteristics of the same species, resulting in GC / FID analysis is relatively low.
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