项目Item 指示剂 |
(Ind) |
外观Appearance 合格 |
pH变色域Visual transition interval 5.2(黄)~6.8(紫) |
溶解试验Solubility 合格 |
干燥失重Drying loss,% ≤0.5 |
灼烧残渣(以硫酸盐计)Ignition residue,% ≤0.1 |
品级Grade 高纯级 |
外观Appearance 灰色至浅紫色或粉红色至黄褐色粉末 |
红外光谱鉴别Infrared spectrometry Conforms |
纯度Purity ≥98.0% (HPLC area) |
吸光值Absorbance ≥0.540(5mg/L, pH 7.2, 588.0 to 592.0 nm) |
醇溶解试验Solubility in EtOH Clear c = 0.1% |
pH变色域Transition interval(pH) 5.2(yellow) to 6.8(purple) |