咪唑

无色或白色棱柱体结晶。易溶于水、乙醇、乙醚、氯仿和吡啶，微溶于苯，极微溶于石油醚。半数致死量(小鼠，经口)1880mg/kg。有腐蚀性。
熔点：86-92℃
沸点：257℃
闪点：145℃

99%:

外观Appearance                          白色薄片或结晶
红外光谱鉴别Infrared spectrometry       和对照匹配
纯度Purity                              ≥99.0% (GC)  
熔点Melting point                       85°C - 90°C
水分water                               ≤0.2%(K.F)


99.5%（用于缓冲溶液）:

外观Appearance                          白色至类白色粉末
红外光谱鉴别Infrared spectrometry       Conforms
纯度Purity                              ≥99.5% (GC)  
熔点Melting point                       86°C - 92°C
灼烧残渣ign. residue (900 °C)          ≤0.1%
pH                                      9.5-11.0 (25 °C, 50 mg/mL in H2O)
pKa (25 °C)                            6.95
氯chloride (Cl-):                       ≤50 ppm
硫酸根sulfate (SO42-):                  ≤50 ppm
  Ca:                                   ≤10 ppm
  Cd:                                   ≤5 ppm
  Co:                                   ≤5 ppm
  Cr:                                   ≤5 ppm
  Cu:                                   ≤5 ppm
  Fe:                                   ≤5 ppm
  K:                                    ≤50 ppm
  Mg:                                   ≤5 ppm
  Mn:                                   ≤5 ppm
  Na:                                   ≤50 ppm
  Ni:                                   ≤5 ppm
  Pb:                                   ≤5 ppm
  Zn:                                   ≤5 ppm


品级Grade                               荧光分析级  
                                    (for Fluorimetric Analysis)
外观Appearance                          白色至类白色粉末
红外光谱鉴别Infrared spectrometry       Conforms
纯度Purity                              ≥99.5% (GC)  
熔点Melting point                       86°C - 92°C
不溶物insoluble matter,                 passes filter test
水分water                               ≤0.2%（K.F)  
灼烧残渣ign. residue (900 °C)          ≤0.05%
荧光fluorescence λex 200-600 nm; λem 300-800 nm (corresponds)
pH                                      9.5-11.0 (25 °C, 0.1 M in H2O)
pKa (25 °C)                            6.95
氯chloride (Cl-):                       ≤50 ppm
硫酸根sulfate (SO42-):                  ≤50 ppm
  Al:                                   ≤10 ppm
  As:                                   ≤0.1 ppm
  Ba:                                   ≤5 ppm
  Bi:                                   ≤5 ppm
  Ca:                                   ≤50 ppm
  Cd:                                   ≤5 ppm
  Co:                                   ≤5 ppm
  Cr:                                   ≤5 ppm
  Cu:                                   ≤5 ppm
  Fe:                                   ≤5 ppm
  K:                                   ≤50 ppm
  Li:                                   ≤5 ppm
  Mg:                                   ≤5 ppm
  Mn:                                   ≤5 ppm
  Mo:                                   ≤5 ppm
  Na:                                   ≤50 ppm
  Ni:                                   ≤5 ppm
  Pb:                                   ≤5 ppm
  Sr:                                   ≤5 ppm
  Zn:                                   ≤5 ppm
λ 0.1 M in H2O
紫外吸收UV absorption
  λ: 260 nm Amax:                       0.10
  λ: 280 nm Amax:                       0.10


品级Grade                               分子生物学级  
                                      (for molecular biology)
DNA酶DNases,                            none detected
RNA酶RNases,                            none detected
磷酸酶phosphatases,                     none detected
蛋白酶proteases,                        none detected
外观Appearance                          白色至类白色粉末
红外光谱鉴别Infrared spectrometry       Conforms
纯度Purity                              ≥99.5% (GC)  
熔点Melting point                       86°C - 92°C
不溶物insoluble matter,                 passes filter test
水分water                               ≤0.2%（K.F)  
灼烧残渣ign. residue (900 °C)          ≤0.05%
荧光fluorescence λex 200-600 nm; λem 300-800 nm (corresponds)
pH                                      9.5-11.0 (25 °C, 0.1 M in H2O)
pKa (25 °C)                            6.95
氯chloride (Cl-):                       ≤50 ppm
硫酸根sulfate (SO42-):                  ≤50 ppm
  Al:                                   ≤10 ppm
  As:                                   ≤0.1 ppm
  Ba:                                   ≤5 ppm
  Bi:                                   ≤5 ppm
  Ca:                                   ≤50 ppm
  Cd:                                   ≤5 ppm
  Co:                                   ≤5 ppm
  Cr:                                   ≤5 ppm
  Cu:                                   ≤5 ppm
  Fe:                                   ≤5 ppm
  K:                                   ≤50 ppm
  Li:                                   ≤5 ppm
  Mg:                                   ≤5 ppm
  Mn:                                   ≤5 ppm
  Mo:                                   ≤5 ppm
  Na:                                   ≤50 ppm
  Ni:                                   ≤5 ppm
  Pb:                                   ≤5 ppm
  Sr:                                   ≤5 ppm
  Zn:                                   ≤5 ppm
λ 0.1 M in H2O
紫外吸收UV absorption
  λ: 260 nm Amax:                       0.10
  λ: 280 nm Amax:                       0.10