| 中文摘要 |
本研究使用裹覆2,4-dinitrophenylhydrazine（2,4-DNPH）的固體採集管以及高效率液相層析──紫外線偵測法，發展甲醛、乙醛、丙烯醛及戌醛共同採樣分析方法。此方法在實驗室的模擬環境驗證，驗證項目包括可偵測極限與可量化最低濃度、分析的回收、採集管的負載容量、樣本的穩定性以及精密度與偏差。研究結果發現，四種醛混合存在冷藏（4C）時，樣本中醛衍生物的穩定性依物種而異可達七天至十四天，在室溫下則變差。分析回收率方面，醛類單獨存在或混存時，除戌醛外各別回收率有差異， 單獨（或混存）時的個別回收率範圍依物種而異為12.27%-97.92% （37.80%-103.99%）。 至於採樣管之負載容量由乙醛之0.74 L至甲醛之24 L不等。整體而言，使用2，4-DNPH裹覆300mg/150mg的矽膠管對於四種醛同時採樣不易控制，分別單獨採樣甲醛、乙醛、戌醛則可行性較大，可是需要克服乙醛容易破出之問題，至於丙烯醛由於回收率偏低要成為實用之方法有待進一步之研究。 |
| 英文摘要 |
An air sampling and analytical method was developed for formaldehyde, acetaldehyde, acrolein and valeraldehyde by using a 2,4-dinitrophenylhydrazine ( 2,4-DNPH ) coated silica gel tube and high performance liquid chromatography-ultraviolet detection. The method was evaluated in simulated conditions in laboratory. Evaluation experiment addressed limits of detection and quantification, analytical recovery, sampler loading capacity, sample stability and precision as well as bias. Based on the findings of this work, samples remained stable under refrigerated conditions, depending on chemical species, but they were rather unstable at ambient conditions, when stored up to seven to fourteen days. Analytical recovery differed in chemical species either and was dependent on the coexisted chemicals. Analytical recovery for each aliphatic aldehyde ranged from 12.27% to 97.92% for single component and from 37.80% to 103.99% for multiple components. Sampler loading capacity also varied with chemical species, from 0.74 L for acetaldehyde to 24 L for formaldehyde. In conclusion, simultaneously sampling formaldehyde, acetaldehyde, acrolein and valeraldehyde by using 2,4-DNPH coated 300/150 mg silica gel tube was not applicable. However, the method by using the tube incorporated with HPLC-UV detection may be feasible for a single component sampling and analysis of formaldehyde, acetaldehyde and valeraldehyde if the breakthrough of acetaldehyde can be resolved. Besides, application of this method to acrolein needs further study because of very low analytical recovery. |
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