Published:Journal of Chromatographic Science,
ISSN 0021-9665 Volume
45, Number 10, November/December 2007, pp. 664-670
Capillary Flow Technology with Multi-Dimensional
Gas Chromatography for Trace Analysis of Oxygenated Compounds
in Complex Hydrocarbon Matrices
J. Luong[1], R. Gras[1], G. Yang[2], L. Sieben[1],
and H. Cortes[3]
[1]Dow Chemical Canada, PO BAG 16, Highway 15, Fort Saskatchewan,
Alberta, Canada T8L 2P4,
[2]Dow Chemical China, 5F, Building
C, 512 Yutang Rd, Songjiang, Shanghai, China, and
[3]Dow Chemical
USA, 1897B Building, Midland, MI, 48667 USA
By employing multi-dimension gas chromatography
with capillary flow technology in combination with highly selective
capillary columns and a pressurized liquid injection system,
light oxygenated compounds such as methanol, ethanol, n-propanol,
2-propanol, and n-butanol in the presence of either light hydrocarbon,
heavy hydrocarbon, or aromatic matrices can be measured accurately
with minimal possibility of a false positive. Using this technique,
a detection limit of at least 0.20 ppm (w/w) with a linear correlation
coefficient greater than 0.9993 over a range from 0.5 ppm to
600 ppm (w/w) and a relative standard deviation of greater than
2.7% are achieved for the solutes tested. The technique can also
be effective for the measurement of other classes of oxygenated
compounds such as ethers, aldehydes, and ketones. Another added
benefit for the implementation of capillary flow technology is
the capability to conduct column back-flushing, where heavier,
undesired solutes in a sample can be back-flushed from the chromatographic
system to improve system cleanliness and sample throughput.
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