Journal
JOURNAL OF CHROMATOGRAPHY A
Volume 1216, Issue 12, Pages 2270-2274Publisher
ELSEVIER
DOI: 10.1016/j.chroma.2009.01.037
Keywords
Carbon nanotubes; Sorbent; Micro-SPE; Liquid chromatography
Funding
- US Geological Survey-New Jersey Water Resource Research Institute (2008)
Ask authors/readers for more resources
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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available