项目                                                 优级纯 
                                                       (GR)
外观Appearance                               清澈、无悬浮物
纯度Purity                                       ≥99.9% (GC)
色度Color scale，Hazen单位                ≤10（铂-钴色号）
水water                                         ≤250 ppm
铁Iron(Fe)                                     ≤0.050ppm 
酸度Acidity（乙酸计）                     ≤100.0ppm 
碱度alkalinity（二甲胺计）                ≤5.0ppm
电导率conductivity（25℃）             ≤0.50 us/cm

项目                                                   化学纯 
                                                          (CP)
纯度Purity                                          ≥98.0% (GC)
沸程Boiling range,℃                            164.0~167.0
比重Specific gravity (20/20°C)              0.938～0.942 
折光率Refractive index n20/D               1.437～1.439     
酸度Acidity(以H+计)/（mmol/100g）     ≤0.002 
水分water                                         ≤0.10% 

项目                                                   色谱纯
                                                        (HPLC)
纯度Purity                                         ≥99.8% (GC)
紫外吸光度UV Absorbance:
最大吸收波长Wavelength (nm) Max. Absorbance
268                                                1.000
275                                                0.300
300                                                0.080
350                                                0.005
400                                                0.005
溶剂洗脱杂质GC Impurities Eluting Before Solvent  <0.5 mg/L
水分Water                                          <0.03%
（色谱纯用于HPLC, GC和光谱级，氮气封装。）

品级Grade                                                   光谱级 
                                                          (for spectroscopy)
外观Appearance                                    白色至米黄色粉末
红外光谱鉴别Infrared spectrometry          Conforms
纯度Purity                                            ≥99.8% (GC)
λ H2O reference 
UV Absorbance 400nm                     ≤0.01
UV Absorbance 360nm                     ≤0.01
UV Absorbance 320nm                     ≤0.03
UV Absorbance 310nm                     ≤0.05
UV Absorbance 290nm                     ≤0.15
UV Absorbance 280nm                     ≤0.30
UV Absorbance 270nm                     ≤1.0
水分Water (by Karl Fischer)               ≤0.05 %
蒸发残渣Residue on Evaporation        ≤0.001 %

品级Grade                                          多肽合成级 
                                              (grade for peptide synthesis)
外观Appearance                                 透明液体
红外光谱鉴别Infrared spectrometry       Conforms
纯度Purity                                         ≥99.8% (GC)
水分water                                        ≤0.02% 
胺测试实验suitability in amine test        pass test