项目                                             分析纯
                                                  (AR)
纯度Purity(Mg)                                   4.0%~5.0%(络合法Complexometry)
外观Appearance                                   细小，轻的白色粉末
干燥失重Loss on drying                           <6 %(1 g, 105°C)
重金属Heavy metals                               ≤0.001%
痕量分析Trace analysis ：
铅Pb                                             < 10 ppm
氯Cl                                             < 0.1 %
硫酸根SO4                                        ≤0.5%
砷(As)                                           ≤3mg/kg
硬脂酸和棕榈酸相对含量stearic and palmitic acid  ≥90.0%
硬脂酸Stearic acid                               ≥40.0%(GC)


品级Grade                                       Ph. Eur., BP  
硬脂酸stearic acid                              ≥40%(GC)
硬脂酸和棕榈酸stearic and palmitic acid         ≥90%
镁Mg basis (calc on dry sub.)                   4.0-5.0%
酸度或碱度acidity or alkalinity,                complies
微生物杂质microbiological impurity,             in accordance
溶剂残渣residual solvents,                      complies
干燥损失loss on drying, 105 °C                 ≤6.0%
酸值acid value                                  195?210(fatty acid)
氯chloride (Cl-):                               ≤1000 ppm
硫酸根sulfate (SO42-):                          ≤5000 ppm
镉Cd:                                           ≤3 ppm
镍Ni:                                           ≤5 ppm
铅Pb:                                           ≤10 ppm
鉴别试验identity                                passes test

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