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
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
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