|Articles|January 1, 2002

LCGC North America

  • LCGC North America-01-01-2002
  • Volume 20
  • Issue 1

The Benefits of Reversed Phases with Extended Polar Selectivity in Analyzing Wide-Polarity-Range Samples

Author(s)I. Chappell

This article describes the use of phases with extended polar selectivity to reduce analysis time for wide-polarity-range samples such as an insecticide, simulated carboxylic acid degradants, and phthalate esters.


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Figure 2. Split injection used to measure triplicate test of MTBE, hexane, o-xylene, and 1-methylnaphthalene comparing different solvents (methanol, methylene chloride) and column insertion distances starting with 0.5 mm, 5.0 mm, 10.0 mm, 15 mm, and 20.0 mm. Methanol had the best performance at the 5.0 mm insertion distance and methylene chloride looked slightly better at the 0.5 mm. We would still recommend not going below the 5.0 mm manufacturer recommended insertion distance.
Revisiting insertion distance for methanol and methylene chloride in GC analysis and confirming that insertion depth strongly affects response and reproducibility.