Appearance: white or brown powder, tastless or special smell, water-dissolving, not dissolving to ethanol or ethyl oxide.

Content of nitrogen : 98. 5%? ? ? ? ? ? ? ? ? ? ? specific rotation: :+18. 0-+21. 4

Loss on drying(max)1. 0%? Ammonium salt(max)0. 04%? ? PH: 5. 0-6. 0

Heavy metal(pb): (max)0. 003%? ? Arsenic(As)(max)0. 0002%

Storage: Store in shade, shelter from dampness or rain