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Specification

1. Appearance:

Light yellowish to white crystalline powder

1. Identification A:

Matches standard

1. Identification B:

Absorptivities at 360nm, do not differ by more than 3.0%

1. Melting range:

Between 81°C and 86°C

1. Loss on drying:

It loses not more than 0.5% of its weight

1. Impurity:

Not more than 3.0% of any individual impurity is found

The sum of all the impurities is not more than 4.5%

1. Assay:

Between 97.0% and 104.0%

1. Specific extinction:

1150.0 ~ 1180.0

1. Arsenic content:

Not more than 2.0ppm

1. Heavy metals (Pb):

Not more than 20.0ppm