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| specifications︰ | Item BP93 USP24 GB1998
Appearance White crystal White crystal /
Identification test Coincidence Coincidence Coincidence
Solubility Coincidence Coincidence /
Clarity & color & luster Clear Coincidence Clear
Heavy metal(Pb) 0ppm 0.001% 0.0005%
As / 3ppm 0.0001%
Ca 200ppm / 0.02%
Oxalate S Coincidence 0.01%
Easy carbonized matter Coincidence Coincidence no darker than standard
Sulfate 150ppm Coincidence 0.015%
Ba Coincidence / Coincidence
Fe 50ppm / 0.001%
Cl 50ppm / 0.005%
Vitriol Ash 0.1% 0.05% 0.1%
Organic volatile matter / Coincidence /
Moisture 0.1% 0.5% 0.5%
Content 99.5-101.0% 99.5-100.5% 99.5%-101%
Color & luster / / Coincidence
Whiteness value / / Coincidence
Graininess / / Coincidence
Mechanical impurity / / Coincidence
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