紅外光感測器檢測水溶液中揮發性化合物之方法開發

Development of Infrared Sensing Method for the Determination of Volatile Compounds in Aqueous Solutions

蔡淑霞(Shu-Sha Tsai)

指導教授 ： 楊吉斯

中原大學/理學院/化學研究所/碩士(2001年)

https://doi.org/10.6840/cycu200100071

摘要

摘要
本研究主要探討以上空間固相微量萃取法結合紅外線光學感測器，偵測水中揮發性有機質之可行性，紅外光之感測模式為減弱式全反射法，其晶體經疏水性高分子(聚異丁烷)覆膜後，便可以有效吸附由水中揮發上來之有機質，如此便可直接感測吸附有機質之紅外光譜圖，為了解影響此偵測法之變因，研究中以數種高揮發性樣品：
Chloroform,TCE,Chlorobenzene,Toluene,Benzene,1-CN為指標分子分別對變因如攪拌、加溫、上空間體積、覆膜體積、樣品體積等加以探討結果證明顯示攪拌可以有效提高分析物之訊號，並有效縮短平衡時間至15分鐘以內另外覆膜厚度受限於紅外光之穿透深度影響，因此最佳覆膜之疏水層物質之濃度為2%，另外溫度亦能有效提高揮發有機質之效率。為受限紅外光晶體材質，溫度只能加至60°左右。因此更探討以加入冷卻感測晶體的萃取樣品之方式，進而提高偵測之靈敏度。由於冷卻的效應可降低感測晶體對於溫度所造成分配係數的改變，所以在本篇論文的第二階段實驗即加入冷卻效應並以其最佳化之實驗條件測量指標分子，其靈敏度可至數十個ppb，並具良好之線性關係,濃度範圍由5ppm~200ppm，R-square皆可高達0.99以上。且更可應用在偵測揮發性較低的樣品 ，所以本實驗方法可以有效應用至環境檢體上。

關鍵字

上空間微量萃取法 ； 揮發性有機化合物 ； 衰減式全反射 ； 紅外光 ； 固相微量萃取法

並列摘要

ABSTRACT
The method based on combination of the technique of headspace solid phase microextraction (HSSPME) to that of attenuated total reflectance (ATR) infrared (IR) sensing probe was developed toward detection of volatile compounds in aqueous solutions. This method can effectively eliminated the problems associated in soaking type of probes, such as pilling hydrophobic film from the sensing elements and the variation of analytical signals caused by the matrix composition. A specially designed sample cell was proposed for this purpose, which allowed to examine the performance of HSSPME/ATR-IR method and its related factors, such as the effect of agitation, headspace volume, sample volume, and temperature. Results showed that a fast speed was observed for the detection of VOCs in the HSSPME/ATR-IR method. The typical time for reaching the maximum analytical signals was around 20 minutes. Much stronger signals were obtained by applying agitation to the aqueous solution and it influences more effectively for lower volatility compounds. The headspace volume influenced the analytical signals strongly for low volatility compounds, but was only slight for highly volatile compounds. An increase in the sample volume can result in stronger analytical signals but limited to a certain signal. By examining five VOCs with different volatility, the obtained linear regression coefficients (R-square) on their standard curves in the concentration range of 5 to 200 ppm were higher than 0.99. The typical detection limit using this method was around a few hundred ppb. The absorbed probe regeneration was highly efficient and typically the regeneration time was shorter than five minutes.

並列關鍵字

ATR ； HSSPME ； VOCs ； SPME ； Infrared(IR)

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