Appearance Light yellow with gray or gray-green powder or granules
Identification meets the requirements
Organic volatile impurities meets the requirements
Reducing substances meets the requirements
Oxalic acid meets the requirements
Assay(on dry basis) 97.0%-102.0%
Water 6.5-10.0%
Chloride 0.07% max
Sulfate 0.1% max
Lead 0.001% max
Mercury 3ppm max
Arsenic 3ppm max
Fe(3+) 2.0% max