质量标准
外观Appearance White Powder
纯度Purity (Titration by NaOH) ≥98 %
纯度Purity(HPLC) ≥98.0%
可溶性Solubility Colorless,Clear ,0.1 M at 20 deg C
不溶物Insoluble matter ≤0.1 %
pH 4.0 - 5.5 (C = 0.1 M at 20 deg C)
铵Ammonia (NH3) ≤0.05 %
灼烧残渣Residue on ignition (Ash) ≤0.1 %
氯Chloride (Cl) ≤0.05 %
硫酸根SO4 ≤0.05 %
铝Aluminum (Al) ≤0.0005 %
钙Calcium (Ca) ≤0.0005 %
铜Copper (Cu) ≤0.0005 %
铁Iron (Fe) ≤0.0005 %
铅Lead (Pb) ≤0.001 %
镁Magnesium (Mg) ≤0.0005 %
磷Phosphorus (P) ≤0.0005 %
钠Sodium (Na) ≤0.01 %
锌Zinc (Zn) ≤0.0005 %
钾Potassium (K) ≤0.005 %
UV Absorbance 260nm(0.1 M in H2O) ≤0.025
UV Absorbance 280nm(0.1 M in H2O) ≤0.025