L-抗坏血酸 99%

规格测试结果

• Appearance:
  White to off-white Crystalline powder or crystals
• Infrared spectrum:
  Conforms
• Titration Iodimetric:
  ≥98.5 %
• Sulfated ash:
  ≤0.1 %
• Solubility:
  (5 % in water) Passes test
• pH:
  2.1 to 2.6 (5 % in water)
• Specific optical rotation:
  +20.5° to +21.5° (20°C, 589 nm) (c=10, H2O)
• Copper (Cu):
  ≤5 ppm
• Iron (Fe):
  ≤2 ppm
• Heavy metals (as Pb):
  ≤10 ppm
• Impurity:
  ≤0.2 % Oxalic acid