质量标准: 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