First, the true urea is white or yellowish white needle-like, shuttle-like or round granular crystal, tasteless, completely soluble in water, otherwise it is a fake urea.
The second is to take a small amount of sample into the lime water, the ammonia smell is not true, and the ammonia smell can be smelled by other fertilizers or nitrogen fertilizers with other substances.
The third is to ignite a few pieces of charcoal, or to burn iron or tiles with fire, and put a little urea on it to burn, white smoke, pungent ammonia smell, and quickly turn into water as true urea; When it is burning, it is slightly boiling, and it emits a "beep" sound, which indicates that ammonium sulfate is added, which is inferior; if it emits hydrochloric acid, it indicates that it is mixed with ammonia chloride; if it burns, it will have a slight flame. , in which ammonium nitrate is blended.
The second is to take a small amount of sample into the lime water, the ammonia smell is not true, and the ammonia smell can be smelled by other fertilizers or nitrogen fertilizers with other substances.
The third is to ignite a few pieces of charcoal, or to burn iron or tiles with fire, and put a little urea on it to burn, white smoke, pungent ammonia smell, and quickly turn into water as true urea; When it is burning, it is slightly boiling, and it emits a "beep" sound, which indicates that ammonium sulfate is added, which is inferior; if it emits hydrochloric acid, it indicates that it is mixed with ammonia chloride; if it burns, it will have a slight flame. , in which ammonium nitrate is blended.
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