ITEM
|
STANDARD
|
Appearance
|
Colorless, transparent hexagonal or needlelike crystals
|
Odor
|
Have the characteristic odor ofChinese natural menthol
|
Purity (%)
|
>= 99.5
|
Melting point (℃)
|
41.5 ~ 44.0
|
Solubility (25 ℃)
|
Melting 1 gram test sample into 5ml 90% alcohol
|
Non- volatile matter (%)
|
=< 0.05
|
Specific rotation(25℃)
|
- 50° ~ - 49°
|
Arsenic (As)
|
=< 3 mg/kg
|
Lead (Pb)
|
=< 2 mg/ kg
|
Mercury (Hg)
|
=< 1 mg/ kg
|
Heavy Metals (as PB)
|
=< 10 mg/ kg
|