性状  无色液体。具有吸湿性。能与3分子水形成共沸混合物，能随水蒸气挥发。能与水、乙醇、乙醚、石油醚、油类和其他多数有机溶剂混和。弱碱性。0.2mol/L水溶pH8.5。
密度:0.98272
熔点:-41.6℃
沸点:115.2-115.3℃
折光率:1.5092
闪点:20℃

质量标准  
项目Item                                分析纯     
                                        (AR)       
含量(C5H5N)Assay,%                    ≥ 99.5   
沸点Boiling poinr,℃                     115±1     
不挥发物Novolatile,%                  ≤ 0.002       
与水混合试验Miscibility with water       合格       
水分(H5O)Water                        ≤ 0.1       
氯化物(Cl)Chloride,%                  ≤ 0.0005     
硫酸盐(SO4)Sulfate,%                  ≤ 0.001       
氨(NH3)Ammonia,%                      ≤ 0.002       
铜(Cu)Copper                             合格       
还原高锰酸钾物质Potassium permang-
anate reducing substances                合格       

项目                                    色谱级
                                      (HPLC Grade)
纯度Purity                              ≥99.9% (GC)
还原性物质Reducing Substances           Passes test
折光率Refractive Index at 20°C         1.5093 ±0.0008
蒸发残渣Residue                         <0.0004%
硫Sulfate                               <0.001%
水Water                                 <0.05%
λ H2O reference
紫外吸收UV absorption λ:
305 nm A:                               ≤1.00
315 nm A:                               ≤0.15
335 nm A:                               ≤0.02
350-400 nm A:                           ≤0.01

项目                                   无水级
                                （水< 50ppm, extra dry ）
纯度purity                             >99.5% (GC )
外观Appearance                         透明液体
色度Color scale                        <5 APHA
水分Water                              <0.005 % (比色法)
蒸发残渣Residue after evaporation      <0.001 %
0.2um膜过滤Filt.over 0.2 micron        PFTE

项目                                    ACS级 
                                    (ACS Grade)
含量Assay                             ≥99.8%
水溶解试验Clarity of aqueous solution Passes test
蒸发残渣Residue after evaporation     ≤0.002%
水分(H2O)Water                        ≤0.1%
氯化物(Cl)Chloride                    ≤0.001%
硫酸盐(SO4)Sulfate                    ≤0.001%
氨(NH3)Ammonia                        ≤0.002%
铜(Cu)Copper                           5ppm
还原物质Reducing Substances           Passes test

品级Grade                               光谱纯 
                                     (for spectroscopy)
外观Appearance                          无色液体
红外光谱鉴别Infrared spectrometry       Conforms to Structure
纯度Purity                              ≥99.5% (GC) 
水分water                               <0.100% (by Karl Fischer)
蒸发残渣Residue after evaporation       <0.002%
λ H2O reference
UV absorption
  λ: 315 nm A:                          ≤1.00
  λ: 330 nm A:                          ≤0.15
  λ: 335 nm A:                          ≤0.05
  λ: 350 nm A:                          ≤0.01
  λ: 400 nm A:                          ≤0.01
贮存  密封避光保存。
用途  溶剂，有机合成。检定和测定锑、砷、铝、铋、镉、铈、氯酸盐、铬酸盐、氰酸盐、铬、钴、铜、氰化物、金、重铬酸盐、卤素、镧、铅、锂、锰、汞、锗、镍、高氯酸盐、过硫酸盐、铂、磷、铼、镨、硅、银、硫、铊、碲、硫氰酸盐、钍、硫代硫酸盐、钛、铀、钒、锌、锆。水分测定，菌种诱变剂。酰化反应的溶剂。催化剂。
联合国编号  1282
Risk：  R11- R20/21/22-
Safety :  S26 - S28A-