固相微萃取技術利用聚二甲基矽氧烷纖維於有機溶劑水溶液吸附現象之研究; Sorption of organic aqueous solution in polydimethylsiolxane fibers of solid-phase microextraction

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题名:	固相微萃取技術利用聚二甲基矽氧烷纖維於有機溶劑水溶液吸附現象之研究;Sorption of organic aqueous solution in polydimethylsiolxane fibers of solid-phase microextraction
作者:	楊秀文;Hsiu-Wen Yang
贡献者:	中國醫藥大學：職業安全衛生學系碩士班
关键词:	固相微萃取;聚二甲基矽氧烷;擴散係數;質傳機制;solid-phase microextraction (SPME);polydimethylsiloxane (PDMS);diffusion coefficient;mass transfer
日期:	2009-07-09
上传时间:	2009-08-12 15:21:09 (UTC+8)
摘要:	聚二甲基矽氧烷(polydimethylsiloixane, PDMS)材質廣泛運用於商業用途上，如接著劑、填充劑等，PDMS為固相微萃取(solid phase microextraction, SPME)方法所經常使用之靜相聚合物薄膜，利用PDMS對揮發性有機物之吸附特性可於氣體或液體樣品中採樣，相關研究對於揮發性有機物在PDMS/SPME之質傳機制仍相當欠缺。本研究以批次實驗探討PDMS/SPME薄膜在苯及甲苯之有機水溶液的吸附現象，並利用溶解-擴散(solution-diffusion)模式推估其於PDMS膜中之擴散係數，推估之擴散係數經模擬後可得到良好之一致性及相關性。本研究發現苯及甲苯於PDMS/SPME之擴散係數明顯受到水溶液的攪拌速率所影響，分別針對濃度為0.854 ppm之苯水溶液及1.01 ppm之甲苯水溶液，擴散係數隨著攪拌速率而增加，並達統計上顯著差異(p<0.05)。而有機溶液濃度改變時，擴散係數之變化未達統計上顯著差異(p>0.5)。由本研究之結果可得到攪拌速度與擴散係數兩者之經驗式，分別為苯水溶液之10-8y=0.0053x+0.866，R2=0.9422及甲苯水溶液之10-8y=0.0018x+0.43，R2=0.865。本研究結果將可作為推估PDMS/SPME萃取速率之基礎，有助於SPME技術之發展應用。 The solid-phase microextraction (SPME) technique has been widely used due to it is solvent-free characteristic in sampling and analysis. Polydimethylsiloxane (PDMS) is known as an excellent material for the extraction of volatile organic compounds (VOCs). However, there is limited experimental work done to investigate the mass transfer mechanism of VOCs onto PDMS/SPME membranes. The object of this study was to investigate the adsorption kinetics of benzene and toluene onto PDMS/SPME membranes. Adsorption isotherm of PDMS in the benzene aqueous solution and toluene aqueous solution were obtained using individual batch experiments. The experimental variables were agitation rates and concentrations of aqueous solution. This study found that the diffusion coefficients of benzene and toluene in PDMS/SPME were linearly increased with agitation rates of aqueous solution (p<0.05). The possible reason may be that the boundary liquid layer around PDMS fiber was shortened by the agitation. On the other hand, the diffusion coefficients were not significantly correlated with the aqueous concentrations (p>0.5). This study could sever as the fundamental work on the mass transfer of VOCs in PDMS, particularly for SPME.
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