Assertion: chlorophyll | /r/HasProperty | retained on the 20 μm filter
Facets:
Source sentences:
text: The concentration of chlorophyll passing through the 2 μm filter was designated C p (picoplankton chlorophyll), chlorophyll retained on the 20 μm filter designated C m (microplankton chlorophyll) and the chlorophyll retained on the 2 μm filter, having passed through the 20 μm filter, designated C n (nanoplankton chlorophyll).