Multi-walled carbon nanotubes as sorptive material for solventless in-tube microextraction (ITEX2)-a factorial design study
- Author(s)
- Thorsten Hüffer, Xochitli L. Osorio, Maik A. Jochmann, Beat Schilling, Torsten C. Schmidt
- Abstract
Multi-walled carbon nanotubes were evaluated as sorptive packing material for in-tube microextraction (ITEX2) in combination with GC-MS for the analysis of benzene, toluene, ethylbenzene, xylenes, and naphthalene in aqueous samples. For method development, a three-level full factorial design of experiment (DoE) was performed incorporating extraction temperature, number of extraction strokes, and extraction flow. The statistical analysis of method development showed that all considered extraction parameters significantly affected the extraction yield. Furthermore, it was shown that some factors significantly interacted with each other, which indicates the advantage of using DoE for method development. The thereby optimized ITEX2 protocol was validated regarding its linear dynamic range, method detection limit (MDL), and precision. The MDLs of investigated analytes ranged between 2 ng L-1 for naphthalene and 11 ng L-1 for p-xylene. The relatively low MDL obtained for naphthalene, despite its comparably low air-water partitioning, can be explained by its strong interaction with carbon nanotubes. All obtained MDLs are at least comparable to previous reports on microextraction techniques, emphasizing both the quality of ITEX2 and the highly promising sorbent characteristics of carbon nanotubes. Furthermore, the method was applied to three real samples, which demonstrated good recoveries of analytes from tap water, a bank filtrate, and an effluent from a wastewater treatment plant. [Figure not available: see fulltext.]
- Organisation(s)
- External organisation(s)
- Universität Duisburg-Essen, BGB Analytik GmbH
- Journal
- Analytical and Bioanalytical Chemistry
- Volume
- 405
- Pages
- 8387-8395
- No. of pages
- 9
- ISSN
- 1618-2642
- DOI
- https://doi.org/10.1007/s00216-013-7249-7
- Publication date
- 10-2013
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 210006 Nanotechnology, 104002 Analytical chemistry, 104023 Environmental chemistry, 105904 Environmental research
- Keywords
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/689d290e-8460-401e-bdb8-75f7a69d84be