Citric Acid 1.purity:99% 2.mainly used as acidulant, flavoring agent, preservative etc in food and beverage industry. FULL TYPICAL ANALYSSI OF SHIPPED ... 11MERCURYPPMMAX 11ASPPMMAX 10.6Usage:Citric Acid is mainly used as acidulant, flavoring agent, preservative and antistaling agent in food and beverage industry. it ... as BP, USP, FCC, etc. and China National Standard:GB. Citric Acid food grade 98%