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Shape selectivity :
Shape selectivity : A key factor in comprehensive two-dimensional gas chromatographic analysis of toxic PCBs
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- Haglund, Peter (författare)
- Umeå universitet,Kemiska institutionen
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- Harju, Mikael (författare)
- Umeå universitet,Kemiska institutionen
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Ong, Ruby (författare)
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Marriott, Philip (författare)
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(creator_code:org_t)
- 2001
- 2001
- Engelska.
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Ingår i: Journal of Microcolumn Separations. - : Wiley. - 1040-7685 .- 1520-667X. ; 13:7, s. 306-311
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- A number of toxic planar PCBs, that is, PCB 77, 105, 118, 126, 156, and 169, were successfully separated from other PCB congeners present in technical PCB formulations using comprehensive GC×GC. The planar PCBs were selectively retained using a liquid crystal column, which was used as the first-dimension column. A short and narrow bore (0.25 m×0.1 mm) nonpolar 5%-phenyl-methylpoly-siloxane column was used as the second-dimension column. A longitudinally modulating cryogenic system (LMCS) was used to modulate the first-dimension signal. Since the planar PCBs elute from the first column at relatively high oven temperatures they were rapidly eluted from the second column. Altogether, this resulted in a significant peak sharpening, and a 20-fold increase in the signal-to-noise ratio, as compared to standard one-dimensional GC. This column set also seems to separate seven frequently measured congeners, that is, PCBs 28, 52, 101, 118, 138, 153, and 180, from other major PCB congeners.
Nyckelord
- comprehensive two-dimensional gas chromatography
- fast analysis
- peak compression
- shape selectivity
- toxic PCBs
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- art (ämneskategori)
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