Urea
The appearance is white, spherical particles, soluble in water and liquid ammonia, and pure urea begins to show instability when heated to near the melting point under normal pressure. If you put a clean piece of iron on the stove and put the urea granules on it, it can be seen that the urea melts and volatilizes quickly, and a small amount of white smoke is emitted, which can smell ammonia.
Ammonium sulfate
It is white or light-colored crystal, absorbs moisture and is easily soluble in water. When ammonium sulfate is heated on the fire, it is seen to melt slowly, accompanied by ammonia odor release.
Ammonium nitrate
The appearance is white, no visible impurities, very sensitive to the effects of heat. A large amount of ammonium nitrate is easily decomposed by heat, and combustion can occur, so that it is explosive, accompanied by white smoke, smells of ammonia, and the aqueous solution is acidic.
Ammonium chloride
For white crystals, agricultural products are allowed to have a yellowish color, strong water absorption and easy to agglomerate. A small amount of ammonium chloride is heated on the fire to smell a strong irritating odor accompanied by white smoke. The ammonium chloride will melt rapidly and disappear completely. The unmelted part will be yellow during the melting process.
Ammonium bicarbonate
Appearance is white or slightly gray crystal with ammonia smell. It is highly hygroscopic, soluble in water, and the aqueous solution is weakly acidic. When you easily identify ammonium bicarbonate, you can use a finger to take a small amount of sample for rubbing, you can smell a strong ammonia smell.
Superphosphate
Appearance is dark gray, grayish white, light yellow, is an acidic chemical fertilizer, sensitive to the action of alkali, easy to lose fertilizer effect. Some of them are soluble in water and the aqueous solution is acidic. Under normal circumstances, the hygroscopicity is small, such as moisture absorption when the air humidity reaches 80% or more, forming a hard block.
Calcium magnesium phosphate
The appearance is grayish white, grayish green or grayish black powder, which looks very fine. Under the sunlight, it is generally seen that the pulverized, glass-like object exists, sparkling, and does not change when heated on the fire.
Compound fertilizer
The appearance should be a taupe or off-white granular product with no visible mechanical impurities present. When the compound fertilizer is heated on the flame, white smoke is observed, and the smell of ammonia can be smelled, and it cannot be completely melted.
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