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)
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