Chromatographic properties of various polysiloxane stationary phases for separation of 2,3,7,8-chloro-substituted dibenzo-p-dioxin and dibenzofuran isomers-a systematic comparison
✍ Scribed by Schmid, P.
- Book ID
- 102352993
- Publisher
- John Wiley and Sons
- Year
- 1989
- Tongue
- English
- Weight
- 414 KB
- Volume
- 12
- Category
- Article
- ISSN
- 0935-6304
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✦ Synopsis
isomer separations require long columns and hence long analysis times Thus the baseline separation of 2,3,7,8-TCDD from other isomers requires a column of about 60 m [2,3] The selectivity of apolar phases such a s methyl polysiloxanes proved insufficient for isomer separation, but these phases are useful for group separations of PCDDs and PCDFs and are therefore recommended for screening [3,9]
Glass
capillaries coated with four crosslinked and surfacebonded OH-terminated polysiloxanes [PS 347.5, OV-17-OH, OV-225-OH, and OV-240-OHI were compared with commonly used methyl-terminated SP-2330-coated columns with respect to their selectivity for the separation of 2,3,7,8-chloro-substituted dibenzo-p-dioxins and dibenzofurans. The methyl-and phenylsubstituted phases [PS 347.5 and OV-17-OHI exhibit only moderate isomer selectivity which limits their applicability in this field. The examined 3-cyanopropyl-substituted phases [OV-225-OH, OV-240-OH, and SP-23301 allow complete separation of all 2,3,7,8-~hlorosubstituted PCDDs and PCDFs. With SP-2330 longer columns are required (50 m) for baseline separation of critical groups of isomers. OV-225-OH was found to be the most suitable phase as to isomerselectivity. In comparison to SP-2330, the analysis times can be reduced bya factor of two.