无色结晶，熔点116℃，相对密度1.27。易溶于水，溶于醇及氨水。易潮解。

项目                                                  分析纯        化学纯
                                                             (AR)          （CP）
pH（50g/L，25℃）                       6.0～7.0      6.0～7.0
澄清度试验                                        合格           合格
含量Assay                                       ≥98.0%        97.0%
硫酸盐Sulfate                                 ≤0.005%       0.01%
氯化物(Cl)Chloride                        ≤0.001%       0.004%
重金属(以Pb计)Heavy metals             ≤0.0002%      0.0004％ 
铁(Fe)Iron                                       ≤0.0005%      0.001% 
灼烧残渣Ignition residue               ≤0.01%        0.04% 

品级Grade                               超纯级,≥99.0%    
                                      (ultra pure,≥99.0% ) 
含量assay ≥99.0% (calc. based on dry substance, NT) 
不溶物insoluble matter,                 passes filter test 
水分water                               ≤2% 
灼烧残渣Residue on ignition (900°C)    ≤0.1% (as SO4) 
pH                                      5.5-7.5 (25 °C, 1 M in H2O) 
熔点Melting point                       119-121 °C
痕量阴离子anion traces by ICP-MS
  氯chloride (Cl-):                     ≤50 ppm 
  硫酸根sulfate (SO42-):                ≤50 ppm 
痕量阳离子cation traces 
  Al:                                   ≤5 ppm 
  As:                                   ≤0.1 ppm 
  Ba:                                   ≤5 ppm 
  Bi:                                   ≤5 ppm 
  Ca:                                   ≤10 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 1 M in H2O 
紫外吸收UV absorption
  λ: 260 nm A:                          ≤0.01 
  λ: 280 nm A:                          ≤0.01
 
≥99.995% metals basis：

外观Appearance                          White Moist Crystals 
X-射线衍射分析X-Ray Diffraction         Conforms to Structure
红外光谱Infrared spectrometry           Conforms to Structure
纯度Purity                              ≥99.995% Based On Trace Metals Analysis
总金属杂质Total Metallic Impurities     ≤50ppm by ICP Atomic emission
 
品级Grade                               色谱纯   
                                      (for HPLC，≥99.0%) 
纯度Purity                              ≥99.0% (dried material, NT) 
水分 water                              ≤2%  
pH                                      5.5-7.5 (20 °C, 10% in H2O) 
熔点Melting point                       119-121 °C
水溶性solubility H2O:                   soluble0.1 g/mL at 25 °C, clear, colorless 
λ 10 % in H2O 
紫外吸光值UV absorption 
  λ: 250 nm A:                          ≤0.05 
  λ: 260 nm A:                          ≤0.04 
  λ: 270 nm A:                          ≤0.03  
  λ: 280 nm A:                          ≤0.02 
  λ: 500 nm A:                          ≤0.02 
for RP gradient test                    corresponds to standard 
for filter test                         corresponds to standard
 
品级Grade                               LC-MS专用   
                          (eluent additive for LC-MS，≥99.0%) 
纯度Purity                              ≥99.0% (dried material, NT) 
不溶物insoluble matter,                 passes filter test 
水分water                               ≤2% 
灼烧残渣Residue on ignition (900°C)    ≤0.1% (as SO4) 
pH                                      5.5-7.5 (25 °C, 1 M in H2O) 
熔点Melting point                       119-121 °C
痕量阴离子anion traces by ICP-MS
  氯chloride (Cl-):                     ≤50 ppm 
  硫酸根sulfate (SO42-):                ≤50 ppm 
痕量阳离子cation traces by ICP-MS
  Al:                                   ≤1 ppm 
  As:                                   ≤0.1 ppm               
  Ba:                                   ≤1 ppm 
  Bi:                                   ≤1 ppm 
  Ca:                                   ≤5 ppm 
  Cd:                                   ≤1 ppm 
  Co:                                   ≤1 ppm 
  Cr:                                   ≤1 ppm 
  Cu:                                   ≤1 ppm 
  Fe:                                   ≤1 ppm 
  K:                                    ≤5 ppm 
  Li:                                   ≤1 ppm 
  Mg:                                   ≤1 ppm 
  Mn:                                   ≤1 ppm 
  Mo:                                   ≤1 ppm 
  Na:                                   ≤5 ppm 
  Ni:                                   ≤1 ppm 
  Pb:                                   ≤1 ppm 
  Sr:                                   ≤1 ppm 
  Zn:                                   ≤1 ppm 
suitability in accordance for LC-MS
 
品级Grade                               质谱专用   
                          (for mass spectroscopy, ≥99.0%)
纯度Purity                              ≥99.0% (dried material, NT)  
不溶物insoluble matter,                 passes filter test 
水分water                               ≤2% 
灼烧残渣Residue on ignition (900°C)    ≤0.1% (as SO4) 
pH                                      5.5-7.5 (25 °C, 1 M in H2O) 
熔点Melting point                       119-121 °C
痕量阴离子anion traces by ICP-MS
  氯chloride (Cl-):                     ≤50 ppm 
  硫酸根sulfate (SO42-):                ≤50 ppm 
痕量阳离子cation traces by ICP-MS
  Al:                                   ≤1 ppm 
  As:                                   ≤0.1 ppm               
  Ba:                                   ≤1 ppm 
  Bi:                                   ≤1 ppm 
  Ca:                                   ≤5 ppm 
  Cd:                                   ≤1 ppm 
  Co:                                   ≤1 ppm 
  Cr:                                   ≤1 ppm 
  Cu:                                   ≤1 ppm 
  Fe:                                   ≤1 ppm 
  K:                                    ≤5 ppm 
  Li:                                   ≤1 ppm 
  Mg:                                   ≤1 ppm 
  Mn:                                   ≤1 ppm 
  Mo:                                   ≤1 ppm 
  Na:                                   ≤5 ppm 
  Ni:                                   ≤1 ppm 
  Pb:                                   ≤1 ppm 
  Sr:                                   ≤1 ppm 
  Zn:                                   ≤1 ppm 
λ 1 M in H2O 
紫外吸收UV absorption 
  λ: 260 nm A:                          ≤0.01 
  λ: 280 nm A:                          ≤0.01

用于有机合成，作医药中间体、分析试剂。 
用于电解、电容器行业 
用作分析试剂，也用于有机合成
密封保存