citric acid monohydrate is a weak organic acid and is used to add an acidic or sour taste to foods and soft drinks. specification: description white crystals clarity clear content 99.5-101pct min sulphate 150ppm max oxalate 100ppm max heavy metal 5ppm max barium pass calcium 200ppm max chloride 50ppm max iron 50ppm max sulphated ash 0.1pct max water 7.5-9.0pct max readily carbonisable substances less than standard lead 1ppm max arsenic 1ppm max mercury 1ppm max aluminum 0.2ppm max bacteria endotoxin 0.5IU/mg max the product is in accordance with BP 98, welcome our dear client to contact with us.