Ascorbic Acid, Usage : Industrial

We are offering ascorbic acid.
Characteristics white crystals or crystalline powder
identification positive reaction
melting point 190-192 °c
ph 2.2~2.5
clarity of solution clear
color of solution ≤by7
specific optical rotation +20.5~+21.5°
copper ≤ 5 ppm
heavy metals ≤ 10 ppm
iron ≤ 2 ppm
oxalic acid ≤ 0.2 %
sulphated ash ≤ 0.1 %
residue on ignition ≤0.1 %
organic volatile impurities pass usp test
assay 99.0~100.0%
loss on drying ≤ 0.4 %
lead ≤2 ppm
mercury ≤1 ppm
storage:
kept in a light-proof,well-closed ,dry and cool place