Tannic acid
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Molecular Structure
Detailed Description
"Appearance White crystal
IR Confirm to reference standard
Assay,by Titration 0.1 N NaOH/Dried basis 99.5-101%
Melting point 149-153℃
Water content(By K.F) 0.5% max
Loss on drying 0.5% max
PH(1.0% aqueous) 4.2-5.0
Ultraviolet Absorbance(1.0M aqueous) A(260nm): 0.06Abs unit max
A(280nm): 0.05Abs unit max
Solubility(1.0M aqueous) Clear, colorless solution
Heavy metal 5ppm max
Fe 5ppm max
Ni 3ppm max
"
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