Matched context for impurity and species

The page lists matched contexts for impurity and species.

Share - impurity	Share - species	Phrase
10.97%	5.17%	volatile [time periodicity] {impurity or species}
3.66%	5.07%	oxidize {impurity or species} [perform operation]
5.76%	1.94%	contain {impurity or species} [perform operation]
3.81%	1.54%	gaseous [state] {impurity or species}