acidimetric standard substance的用法和样例：
- Objective: To standard substance of Crebanine (Cre).
- Objective: To study the preparation and analysis technique of standard substance picrinine.
- The content of flavonoids in waste liquid of alcohol production from sugarcane molasses was determined by spectrophotometry using rutin as standard substance.
- The chymopapain whose purity equal to standard substance was get by twice protein chromatography on Macro-Prep High S Support.