PARAMETER LIMIT

• Description A white crystalline powder.
• Solubility 5% solution in water is almost clear and colourless.
• Identification Passes test.
• Assay ( Acidimetric) 99.7 – 100.3%
• pH (1% Aq. soln.) Not more than 8.4

MAXIMUM LIMIT OF IMPURITIES
– Loss on drying (on silica gel for 4 hrs.) 0.25%
– Insoluble matter 0.01 5%
– Insoluble substances Passes test.
– Limit of ammonia Passes test.
– Ammonium (NH4) 0.0005%
– Chloride (Cl) 0.003%
– Nitrogen compounds (N) 0.001%
– Phosphate (PO4) 0.001%
– Silicate (SiO2) 0.005%
– Sulphate (SO4) 0.003%
– Aluminium (Al) 0.00005%
– Arsenic (As) 0.00004%
– Calcium (Ca) 0.005%
– Copper (Cu) 0.005%
– Iron (Fe) 0.001%
– Heavy metsls (as Pb) 0.0005%
– Magnesium (Mg) 0.005%
– Substances reducing iodine 0.0065%
– Normal carbonate Passes test.
– Limit of sulphur compounds 0.01 5%
– Limit of organics 0.01%
– Organic volatile impurities Meets the requirement.