Assertion: urea | /r/MadeOf | impurity
Facets:
Source sentences:
text: In addition, the urea may contain impurities, destabilizing the pH of the reaction medium, for example, ammonium salts (sulfates, nitrates, phosphates and the like) in the urea makes it almost impossible the implementation of this method in industry, because no ammonia will neutralize the effect of these impurities.