1) Assay: 99.0%～100.5% 2) Identification: positive 3) Melting Point: About 190.7°C～190.8°C 4) Clarity of Solution: Clear 5) Color of Solution: ≤ BY7 6) PH Value: 2.1～2.6 ( in 2% solution) 7) Oxalic Acid: ≤ 0.2% 8) Heavy Metals: ≤ 5 ppm 9) Ferrite: ＜2 ppm 10) Arsenic: ＜ 3 ppm 11) Hg: ＜ 1 ppm 12) Lead: ＜ 5 ppm 13) Sulphate Ash: ≤ 0.1% 14) Copper Salt: ≤ 5 ppm 15) Specific Rotation: +20.5?#65374;+21.5?Organic Volatile 16) Impurities: meets the requirements 17) Particle Size: a) 100% pass thru 40 mesh b) 50% pass thru 80 mesh 18) Standard: BP2002 / USP26 Packing: 25kg/carton with PE inner