Assertion: phosphoric acid's amount | /r/HasProperty | introduced
Facets:
value: alternately
type: MANNER
Source sentences:
text: The factors that determine the amount of porosity developed in lignite-based AC treated with phosphoric acid (assuming that at least some amount of steam is introduced) include the kiln temperature and time duration of this activation stage.
text: In order to obtain said crystalline magma, the amounts of sodium carbonate and phosphoric acid required are alternately introduced in portions into a vessel provided with a stirring means.