项目ltem 酸碱指示剂 |
(acid-base indicator) |
pH变色域Visual transition 6.0(黄)~7.6(蓝) |
质量吸收系数Mass absorptivity,L/cm·g ≥52.0 |
乙醇溶解试验Solubility(in ethanol) 合格 |
灼烧残渣(以硫酸盐计)Ignition residue,% ≤0.3 |
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项目 ACS级,95 % |
(ACS, Dye content 95 %) |
外观Appearance 粉棕色至紫色结晶粉末 |
红外光谱鉴别Infrared spectrometry 和对照品匹配 |
染料含量Dye content(HPLC) ≥95% |
澄清度Claroty of solution 合格 |
变色范围Visual transition interval pH 6.0(Yellow-Green)-pH 6.7(Green)-pH 7.6 (Blue) |
Wavelength 419- 425 nm |
c = 0.02g/L; Methanol |
Extinction Coefficient 17,000 |
Wavelength 326- 332 nm |
Extinction Coefficient 8,000 |
Wavelength 279- 285 nm |
Extinction Coefficient 9,000 |