Name of index | BP2010 | E -332(ii) | usp-30 | |||
Description | White, hygroscopic, granular powder or transparent crystals | |||||
Identification | Pass test | Pass test | Pass test | |||
Assay( anhydrous basis) | % | 99.0 -101.0 | ≥99.0 | 99.0-100.5 | ||
Solubility | Very soluble in water, practically insoluble in ethanol(96 per cent) | -- | -- | |||
Appearance of solution | Solution is clear and colorless | -- | -- | |||
Acidity and Alkalinity | Pass test | -- | Pass test | |||
Chloride | ≤ppm | 50 | -- | -- | ||
Heavy metals(as Pb) | ≤ppm | 10 | -- | 10 | ||
Organic volatile impurities | -- | -- | Pass test | |||
Oxalates | ≤% | 0.03 | 0.01 | -- | ||
Sulphates | ≤% | 0.015 | -- | -- | ||
Tartrate | -- | -- | Pass test | |||
Readily carbonisable substances | Pass test | -- | Pass test | |||
Loss on drying, | 4.0-7.0 | ≤6.0(180 °C, 4h) | 3.0-6.0(180 °C, 4h) | |||
Sodium | ≤% | 0.3 | -- | -- | ||
pH(5% aqueous solution) | -- | 7.5-9.0 | -- | |||
Arsenic(As) | ≤ppm | -- | 3 | -- | ||
Lead(Pb) | ≤ppm | -- | 2 | -- | ||
Mercury(Hg) | ≤ppm | -- | 1 | -- |