Items

Specification

Appearance:

Almost white crystalline powder.

Identification:

Positive

Melting point:

132-136?

Clarity and color of solution:

Not more than 0.5

pH value:

2.2-2.8

Loss on drying:

Not more than 4.4%

Residue on Ignition:

Not more than 0.10%

Free sulfur:

Meets the requirement

Heavy metals (Pb):

Not more than 10ppm

Arsenic:

Not more than 5ppm

Assay (on dry basis):

97.0-103.0%