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Using
New
Rxi®-5Sil MS GC Columns
By Robert Freeman, Environmental Innovations Chemist
• Ultra-low bleed column saves you time and money with faster baseline stabilization.
• Highly inert for more accurate low-level analysis of active compounds.
• Guaranteed column-to-column reproducibility.
Semivolatiles methods, such as EPA Method 8270, place stringent demands on the analytical system,
especially the GC column. 5% diphenyl/95% dimethyl polysiloxane (“5” phase) columns often are used
for this GC/MS test method; however, silarylene columns generally perform better with the sensitivity of
mass spectrometers. Silarylene phases are lower bleed and produce improved peak efficiencies for diffi-
cult compounds while maintaining selectivity that is similar to a conventional “5” phase column. Restek
recently improved its silarylene column (Rtx®-5Sil MS) using Rxi® technology. The result is the new
Rxi®-5Sil MS column, a more inert, low-bleed column with improved peak shape and resolution for the
active compounds found in semivolatiles analysis.
Continued on page 4.
Fast, Accurate
Semivolatiles Analysis!
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2007 vol. 4
Environmental