GB/T 10729-89
项目Item                                          指示剂
                                               (pH indicator )
pH变色域Visualtransition interval              8.0(黄色)-10.0(紫红色)
质量吸收系数Mass absorptivity，α(L/cm.g)        68.0-75.0
乙醇溶解试验Solubility in ethanol                  合格
干燥失重Drying loss,%                                 <1.0
灼烧残渣(以硫酸盐计)Ignition residue,%           ≤0.05
98%：
外观Appearance                          白色至类白色粉末
红外光谱鉴别Infrared spectrometry       和对照匹配
纯度Purity(HPLC)                         ≥98.0%  
熔点Melting point                       258°C - 263°C
pH变色域Transition interval(pH)         (colorless)7.8 - 10.0(ponoeau)
干燥损失Loss on drying                  <0.5 % (105°C)
氯Chloride(Cl)                          <100 ppm
硫酸根Sulfate(SO4)                      <200 ppm  
重金属Heavy metals (as Pb)              <10 ppm
硫酸盐灰分Sulfated ash                  <0.1 %

用途：酸碱指示剂, 非水溶液滴定指示剂, 色谱分析试剂。