Assertion: carrier gas | /r/HasProperty | selected for example
Facets:
value: sometimes
type: TEMPORAL
value: based on the sample's matrix
type: CAUSE
Source sentences:
text: When analyzing gas samples, however, the carrier is sometimes selected based on the sample's matrix, for example, when analyzing a mixture in argon, an argon carrier is preferred, because the argon in the sample does not show up on the chromatogram.