L-cysteine hcl Appearance white crystals or crystalline powder; strongly acid taste. Identification infrared absorption Specific optical rotation +5.6~ +8.9 Sulfate f_ 0. 03 % Iron f_ 0. 003 % Heavy metals (as pb), f_ 0.00 15% Organic volatile impurities meets the requirement Loss on drying, f_ 1 % Residue on ignition, c f_ 0.1% Assay 98.5-101.5 % Ph value 1.5 - 2.0 Organic volatile impurities meets the requirement Packing: 25kg fiber drum Usp24
