sodium erythorbate FCCIV/E316,the specification is following: Description White crystalline solid Identification Passes Test A, B, C Assay(%) 98.0 -100.5 Specific rotation [a] D+95.5-+98.0° PH Value5.5 8.0 Heavy metals (mg/kg)10 max Lead (mg/kg) 5 max Arsenic (mg/kg) 3 max Loss on drying (%)0.25 max Mercury (mg/kg) 1 max OxalatePasses Test