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GB/T 10729-89
項目Item                                          指示劑
                                               (pH indicator )
pH變色域Visualtransition interval              8.0(黃色)-10.0(紫紅色)
質(zhì)量吸收系數(shù)Mass absorptivity，α(L/cm.g)        68.0-75.0
乙醇溶解試驗Solubility in ethanol                  合格
干燥失重Drying loss,%                                 <1.0
灼燒殘渣(以硫酸鹽計)Ignition residue,%           ≤0.05
98%：
外觀Appearance                          白色至類白色粉末
紅外光譜鑒別Infrared spectrometry       和對照匹配
純度Purity(HPLC)                         ≥98.0%  
熔點Melting point                       258°C - 263°C
pH變色域Transition interval(pH)         (colorless)7.8 - 10.0(ponoeau)
干燥損失Loss on drying                  <0.5 % (105°C)
氯Chloride(Cl)                          <100 ppm
硫酸根Sulfate(SO4)                      <200 ppm  
重金屬Heavy metals (as Pb)              <10 ppm
硫酸鹽灰分Sulfated ash                  <0.1 %

用途：酸堿指示劑, 非水溶液滴定指示劑, 色譜分析試劑。