期刊
JOURNAL OF CHROMATOGRAPHY A
卷 1216, 期 12, 页码 2270-2274出版社
ELSEVIER
DOI: 10.1016/j.chroma.2009.01.037
关键词
Carbon nanotubes; Sorbent; Micro-SPE; Liquid chromatography
资金
- US Geological Survey-New Jersey Water Resource Research Institute (2008)
In this research we report the implementation of micro-solid-phase extraction (mu-SPE) in the needle of a syringe for integrating sampling, analyte enrichment and sample introduction into a single device. Both single- and multi-walled carbon nanotubes (CNTs) were explored as high performance sorbents for mu-SPE in packed and self assembled formats. The need for such a sorbent was critical because the needle probe could hold only a small amount of material (around 300 mu g). Conventional C-18 and self-assembled CNTs were found to be ineffective with enrichment factors less than one. However, packed beds of CNTs were found to be excellent sorbent phases, where high extraction efficiencies (as high as 27%) as well as enrichment factors (close to 7) could be achieved. The overall method showed excellent linearity, reproducibility, and low method detection limit (0.1-3 ng/mL for MWNTs). The sorption on CNTs followed Freundlich isotherms, and the functionalized CNTs were more effective for enriching the polar compounds. (c) 2009 Published by Elsevier B.V.
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