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Appearance     White Powder
Assay     99.0 ~ 100.5%
Loss on Drying     =< 4%
Acidity and Alkalinity     =< 0.1%
PH (10%Solution )     7.0-9.0
Insoluble in Water     =< 0.15%
Heavy Metals (as Pb)     =< 10 ppm
Arsenic (as As)     =< 3 ppm
Lead     =< 2 ppm
Mercury     =< 1 ppm
Iron     =< 5 ppm
Fluoride     =< 3 ppm
Magnesium     =< 0.4%