Discussion
What does a moisture trap in the carrier line protect?
Answer: B
Water hydrolyses the siloxane backbone of a bonded phase at working temperatures, shortening the column's life and raising the bleed. Detector condensation, injector corrosion and sample dilution are not the concern. Traps for oxygen, water and hydrocarbons in series are standard on a gas line, each protecting against a different slow degradation that would otherwise be blamed on the column itself. A single measurement chosen to respond to the one asymmetry beats several that respond to shared behaviour.
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