Item

　  Standard (top-grade)

　  Standard (first-grade)

　 Assay [as Mg]

　≥98%

　≥98%

　 Specific rotary power [α]D20

　+18.5°～+21.0°

　+18.5°～+21.0°

　 Light transmittance %

　≥98

　≥95

　 Chloride ％

　≤0.02

　≤0.02

　 Sulfate ％

　≤0.03

　≤0.03

　 Loss on dry ％

　≤0.25

　≤0.5

　 Ammonium salt %

　≤0.02

　-

　Arsenic salt(as As2O3)ppm

　≤1

　≤1

　 Heavy metals (as Pb)ppm

　≤10

　≤10

　Ferric salt ppm

　≤20

　-

　PH (10% solution)

　6.0～7.5

　6.0～7.5