Matched context for impurity and by-product

The page lists matched contexts for impurity and by-product.

Share - impurity	Share - by-product	Phrase
16.54%	3.48%	remove {impurity or by-product} [perform operation]
3.94%	1.82%	{impurity or by-product} removal
3.81%	2.06%	gaseous [state] {impurity or by-product}
5.76%	0.95%	contain {impurity or by-product} [perform operation]