Citric acid is a weak organic acid that is produced as a white crystaler. It is a natural food preservative that is also used to add an acidic, or sour taste to foods and soft drinks. Citric acid can also be used as an environmentally benign cleaning agent.Assay 99.5% â 100.5%Moisture ⤠0.5%Heavy Metals â¤10 PPMSulted Ash ⤠0.05%Aluminum ⤠0.2 PPMArsenic ⤠1 PPMLead ⤠0.5 PPM