Was Solar Nebula CO ice primarily mixed with CO2 rather than H2O?

Ascertain whether, in the early Solar Nebula, condensed CO ice resided predominantly in a CO2-rich matrix rather than in H2O-rich ice, analogous to recent observations in at least one protoplanetary disk.

Background

Recent protoplanetary disk observations suggest that CO ice may be mixed mainly with CO2 rather than H2O, which would affect how photochemical pathways and entrapment influence resulting CO abundances and release behavior.

Whether this configuration applied in the Solar Nebula impacts interpretations of cometary CO (e.g., whether CO is associated with H2O or CO2 matrices), and thus bears on the origin of cometary hypervolatiles and the thermal history of comet-forming material.