质量标准
99%:
外观Appearance 白色至米黄色粉末
红外光谱鉴别Infrared spectrometry 符喝
纯度Purity ≥99% (NT) (TLC)
干燥损失Loss on drying <0.2 %
重金属Heavy metals (as Pb) <10 ppm
灼烧残渣Res. after ignition <0.1 %
pH 5.6 ~ 6.1 (1% soln.25°C)
透光度Transmittance >95 % (c=10, 2 N HCl, 430 nm) 1 cm cell
Cl < 200 ppm
SO4 < 200 ppm
NH4 < 200 ppm
Fe < 10 ppm
其它氨基酸Other amino acids <0.2 % (TLC)
≥98.5%, FCC:
外观Appearance White Crystal to Powder
红外光谱鉴别Infrared spectrometry Conforms to Structure
纯度Purity (Titration by HCL04) 98.50 - 101.50 %
水分Water (by Karl Fischer) ≤0.5 %
灼烧残渣Residue on ignition (Ash) ≤0.1 %
砷Arsenic (As) ≤3 ppm
镉Cadmium (Cd) ≤1 ppm
汞Mercury (Hg) ≤1 ppm
铅Lead (Pb) ≤10 ppm