Bianchi Federica, Mattarozzi Monica, Betti Paolo, Bisceglie Franco, Careri Maria, Mangia Alessandro, Sidisky Leonard, Ongarato Stefano, Dalcanale Enrico
Dipartimento di Chimica Generale ed Inorganica, Chimica Analitica, Chimica Fisica, Universita degli Studi di Parma, Viale Usberti 17/A, 43100 Parma, Italy.
Anal Chem. 2008 Aug 15;80(16):6423-30. doi: 10.1021/ac800881g. Epub 2008 Jul 19.
An innovative and very selective solid-phase microextraction coating synthesized by sol-gel technology was developed for the determination of environmental pollutants such as aromatic hydrocarbons at trace levels in air, water, and soil samples. The obtained fibers, composed of quinoxaline-bridged cavitand units, were characterized in terms of film thickness, morphology, thermal stability, and pH resistance. Fibers, characterized by an average thickness of 56 +/- 6 mum, exhibited an excellent thermal stability until 400 degrees C and a very good fiber-to-fiber and batch-to-batch repeatability with RSD lower than 6%. Finally, the capabilities of the developed coating for the selective sampling of aromatic hydrocarbons were proved, obtaining LOD values in the subnanogram per liter range. Extraction efficiency at least 2-fold higher than that obtained using commercial devices was proved for chlorobenzenes sampling in river water, obtaining extraction recoveries ranging from 87.4 +/- 2.6% to 94.7 +/- 1.9%. The selective desorption of benzene in the presence of high amounts of other airborne pollutants was also demonstrated.
通过溶胶-凝胶技术合成了一种创新且具有高选择性的固相微萃取涂层，用于测定空气、水和土壤样品中痕量的环境污染物，如芳烃。所制备的纤维由喹喔啉桥连的穴状配体单元组成，对其膜厚度、形态、热稳定性和耐pH性进行了表征。纤维的平均厚度为56±6μm，在400℃以下表现出优异的热稳定性，纤维间和批次间的重复性非常好，相对标准偏差低于6%。最后，证明了所开发的涂层对芳烃的选择性采样能力，获得了纳克每升范围内的检测限。对于河水中氯苯的采样，证明其萃取效率比使用商业设备至少高2倍，萃取回收率在87.4±2.6%至94.7±1.9%之间。还证明了在存在大量其他空气污染物的情况下苯的选择性解吸。
