质量标准:外观Appearance 白色颗粒性粉末
红外光谱鉴别Infrared spectrometry 符合
纯度Purity ≥99.0% (HPLC)
熔点Melting point 136°C - 140°C
干燥损失Loss on drying <0.5 % (1 g) (vacuum)
重金属Heavy metals (as Pb) <20 ppm
硫酸盐灰分Sulfated ash <0.1 %
醇溶解试验Solubility in ethanol 溶液透明((1 g in 9 ml ethanol)
游离水杨酸salicylic acid: < 0.05%
相关物质Related substances <0.1 %
USP级
ASSAY (C9H8O4) 99.5 - 100.5 %
LOSS ON DRYING -- 0.5 %
READILY CARBONIZABLE SUBSTANCES -- TO PASS TEST
RESIDUE ON IGNITION -- 0.05 %
SUBSTANCES INSOLUBLE IN SODIUM CARBONATE -- TO PASS TEST
CHLORIDE (Cl) -- 0.014 %
SULFATE -- 0.04 %
HEAVY METALS -- 10 UG/G
FREE SALICYLIC ACID -- 0.1 %