description white needle crystals or crystalline
assay ≥99.5%
loss on drying ≤0.5%
residue ignition ≤0.5%
specific rotation +175.0°~+185.0°
clarity of water solution transparent,colorless,none suspended
ph 5.0~7.0
melting point 202.0℃~210.0℃
hydroquinone negative
lead ≤10mg/kg
arsenic ≤2 mg/kg
mercury ≤1 mg/kg
methanol ≤2000mg/kg
aerobic bacterial count ≤1000cfu/g
molds and yeast count ≤100 cfu/g
fecal coliforms negative/g
pseudomonas aerginosa negative/g