The First 3 to 10 Meters of a Capillary Column

question 1

Multiple Choice

The first 3 to 10 meters of a capillary column serves as a guard column and retention gaps.Guard columns:

• A)improve peak shape by separating volatile solvent from less volatile solutes prior to chromatography.
• B)divert a portion of the sample to waste to improve peak shape.
• C)accumulate nonvolatile substances to prevent column contamination
• D)begin separation by retaining less volatile solutes from volatile solutes.
• E)increase the number of theoretical plates,reducing plate height.

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