Item Standard Typical Value Appearance White powder White powder Purity % 98.0min 98.1 min (CAI) ml (1% AgNO3) 2.50min 3.00min Fe % 0.005max 0.005max Pb % 0.0005 max 0.0003max As % 0.0002 max 0.0002max Insoluble Substances % 0.1 max 0.1 max pH1%water solution 10.5±0.5 10.5±0.1 Loss on dry % 0.5max 0.5max