Item Specifications Results 性状Description 白色晶体或结晶性粉末White granular powder 白色晶体状粉末White granular powder 鉴别Identification 红外吸收光谱法Infrared Absorption 符合Qualified 含量Assay, 98.5%-101.5% 99.8% 透光率State of solution ≥98%% 98.4% 旋光Specific optical rotation［a］   +20.4o  ~ +21.4o   +21.0o 氯离子 Chloride (as cl) 19.0%~19.6% 19.13% 硫酸根Sulfate(as  SO4) ≤0.03% 0.015% 铁盐 Iron (as Fe) ≤30 ppm 3ppm 重金属Heavy metals,% (as Pb) ≤15 ppm 3ppm 干燥失重Loss on drying ≤0.4% 0.28% 灼烧残渣Residue on ignition, ≤0.1% 0.06%