Department of Chemistry and Environmental Science, New Jersey Institute of Technology, Newark, New Jersey 07102, USA.
Anal Chem. 2010 Jul 1;82(13):5561-7. doi: 10.1021/ac100426y.
Analytical enrichment during continuous hollow fiber membrane extraction involves the movement of analytes from the sample to the extractant. At the same time, a second preconcentration mechanism is provided by out-diffusion of the extracting solvent. These effectively combine extraction and concentration into one step. In this paper, we demonstrate for the first time that the presence of carbon nanotubes (CNTs) can enhance both these phenomenon leading to superior performance in terms of higher enrichment factors and extraction efficiency. The CNTs were immobilized in the pores of a polypropylene hollow fiber and led to nearly 250% enrichment enhancement over the unmodified parent membranes. The detections limits for polycyclic aromatic compounds were between 0.042 and 0.25 microg/L.
在连续中空纤维膜萃取过程中的分析富集涉及分析物从样品到萃取剂的移动。同时，通过提取溶剂的外扩散提供了第二种预浓缩机制。这些机制有效地将萃取和浓缩结合到一个步骤中。在本文中，我们首次证明了碳纳米管 (CNT) 的存在可以增强这两种现象，从而在更高的富集因子和萃取效率方面表现出优异的性能。CNT 被固定在聚丙烯中空纤维的孔中，与未改性的母体膜相比，富集增强了近 250%。多环芳烃的检测限在 0.042 到 0.25 微克/升之间。
