Inspection Item Unit BP93 BP98 USP24 Company standard
Appearance colorless crystal or white crystalline powder
Identification accordance
Light transmittance (405nm) 20%Aq. solution clear 20%Aq. solution clear 20%Aq. solution clear
Assay % 99.5~101.5 99.5~101.0 99.5~100.5 Min 99.8
Moisture % Max 1.0 Max 1.0 Max 0.5 Max 0.20
barium salt accordance Max 1
Calcium salt ppm Max 200 Max 10
Ferric salt ppm Max 50 Max 1
As ppm Max1 Max3 Max 0.3
Heavy metals ppm Max 10 Max10 Max10 Max1
Oxalate ppm Max350 Max350 accordance Max 20
Chloride ppm Max 50 Max 5
Sulfate ppm Max150 Max150 accordance <30
Readily carbonization substance no darker than standard no darker than standard lighter than standard
vitriol ash % Max0.1 Max0.1 Max0.05 Max0.03
organic volatile impurity accordance accordance
Pb ppm Max0.5
Al ppm Max 0.2 Max 0.2
bacterial endotoxin IU/mg Max 0.5 Max 0.5