Assertion: phosgene's effect | /r/HasProperty | evident
Facets:
value: at low ammonia concentrations
type: OTHER
Source sentences:
text: The effect, i.e. improvement in the reaction rate as opposed to the use of NaOH alone, is evident at low ammonia concentrations, and it will be appreciated that, from a purely chemical point of view, higher concentrations of ammonia may be used.