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題 名 | 利用熱脫附氣相層析儀法量測工作環境空氣中氯甲烷與溴乙烯的方法研究=Measurement of Workplace Methyl Chloride and Vinyl Bromide Using Thermodesorption/Gas Chromatorgraphy |
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作 者 | 李昆達; 羅俊光; 汪禧年; | 書刊名 | 勞工安全衛生研究季刊 |
卷 期 | 9:1 2001.03[民90.03] |
頁 次 | 頁13-23 |
分類號 | 412.78 |
關鍵詞 | 熱脫附; 氯甲烷; 溴乙烯; 多重床採樣管; Thermodesorption; Methyl chloride; Vinyl bromide; Multi-bed tube; |
語 文 | 中文(Chinese) |
中文摘要 | 揮發性有機化合物氯甲、溴乙烯屬於低沸點化合物,其沸點分別為-24.2℃、16℃,採樣時因Tenax-TA、Tenax-GR、Carbopack B無法提供足夠的安全採樣體積、所以並不適用。多重床採樣管填充125毫克Carbosieve SIII、200毫克Carbopack B、200毫克 Carbopack C,對於二個碳以上到三十個碳的揮發性有機化合物可提供足夠的採樣體積。分析上,多重床採樣管在250℃、流量30mL/min脫附3分鐘進入冷凍濃縮儀,於-120℃完全被捕捉住,然後再第二次熱脫附進入毛細管柱(CP-Sil 5 60m×0.32mm;膜厚5μm),以火焰游離偵檢器(FID)進行定量性分析。在二十八天的保存期限之下,冷卻溫度4℃與冷凍溫度-30℃並月分解的現象發生,所以建議採樣管的保存須存放在密封罐內,並將密封觀儲存於4℃以下的冰箱。 |
英文摘要 | Methyl chloride and vinyl bromide are both low boiling point volatile organic compounds. The boiling point of methyl chloride is -24.2℃ and the latter is 16℃. A well-known problem is that it is difficult to obtain safety sampling volume by using the adsorbent of Tenax-TA, Tenax-GR, Carbopack B in field sampling. This study successfully demonstrated that multi-bed tubes consisting of Carbosieve SIII、Carbopack B、Carbopack C are capable of grasping enough sampling volume for C2 to C30 volatile organic compounds. In the experiment, with the condition of flow rate 30mL/min for 3 min at 250℃, methyl chloride and vinyl bromide were first thermally desorbed from multi-bed tubes and then cryogenically focused by liquid nitrogen at -120℃, then finally carried into a 60m long capillary column (CP-Sil 5 60m×0.32mm; Film thickness 5um) for separation. The compounds were identified qualitatively and quantitatively by flame ionization detector (FID). Decomposition is negligible within 28 days at freezing temperature -30℃ and cooling temperature 4℃. Hence, the better store condition is in a sealed jar, and were kept under cooling temperature of 4℃ in a refrigerator. |
本系統中英文摘要資訊取自各篇刊載內容。