质量标准
外观Appearance 白色结晶或粉末
红外光谱Infrared spectrum conforms
纯度purity 97.5 - 102.5 % (碘量滴定,按无水物计)
纯度purity ≥98.0%(TLC)
重金属Heavy metals (as Pb) <10 ppm
硫酸灰分Sulfated ash <0.1 %
干燥失重Loss on drying 8.5 % - 12 %
透射率Transmittance >98 % (c=10, H2O, 430 nm,1 cm )