质量标准: | 溴甲酚紫,115-40-2,Bromocresol purple 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 ≥96.0% (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) |