项目                                                       优级纯(GR)
外观Appearance                                     白色结晶粉末
红外光谱鉴定Infrared spectrometry       和对照品匹配  
纯度Purity                                              >99.0% （RT）
水分Water                                            <1 % (K.F.)
重金属Heavy metals (as Pb)                  <10 ppm
硫酸盐灰分Sulfated ash                         <0.05 %
痕量分析Trace analysis  
氯chloride (Cl-):                                     <20 ppm
硫酸根sulfate (SO42-)                            <50 ppm
铁Iron（Fe）                                         <20 ppm

项目                                                       分析纯 (AR)
外观Appearance                                     白色或无色结晶
红外光谱鉴定Infrared spectrometry       和对照品匹配
熔点Melting point                                   189°C - 191°C
纯度Purity                                             ≥98.0% （RT）

99.99% metals basis:

外观Appearance                                   White Powder/Crystals
纯度Purity                                            ≥99.99% Based on Trace Metals Impurities of ICP
纯度Purity                                            98.0 - 102.0 % (Titration by NaOH)  
痕量金属分析total metallic impurities     ≤100ppm by ICP Atomic emission

99.999% metals basis:

外观Appearance                                   White Powder/Crystals
纯度Purity                                            ≥99.999% Based on Trace Metals Impurities of ICP
纯度Purity                                            98.0 - 102.0 % (Titration by NaOH)  
痕量金属分析total metallic impurities     ≤20ppm by ICP Atomic emission