Single element phosphorus teaches you to identify true and false
The single-element phosphorus fertilizers currently circulated on the market are mainly calcium sulphate, and the counterfeit substances that have been found include phosphogypsum, calcium magnesium phosphate fertilizer, waste cement slag, and brick and tile powder. It can be identified by the following methods:
1. Appearance. Pu-Ca is a gray, fluffy powder with acidity; phosphogypsum is an off-white hexagonal columnar crystal or crystalline powder with no sour taste; Ca-Mg-P fertilizer is gray-green or gray-brown, with no sour taste and a very monotonous glass. Fine or fine powder; waste cement slag is gray powder, non-glossy, solid block, coarse powder, no sour taste; brick powder color blue, coarse powder, no sour taste.
2. Feel. Pu-calcium is heavy in texture and feels greasy. Phosphogypsum is light in texture, and it feels lighter in cotton. It is lighter in weight; calcium-magnesium-phosphate-phosphate is of heavy texture and feels cotton, which is more monotonous; waste cement residue is heavy in texture, not monotonous, and there is solid cement residue; Tile powder feels astringent, not monotonous, brick residue exists.
3. Water solubility. General calcium is partially soluble in water; phosphogypsum is completely soluble in water; calcium magnesium phosphate fertilizer is insoluble in water; waste cement powder and brick mortar are accumulated in the presence of water.
4. If there is any of the following conditions, it can be judged as a poor quality product: There are apparent impurities such as clods, stones, and coal cinders in Pu-calcium. If the acidity is too strong and the moisture content is large, unqualified unfinished products are not produced; It was found that the color was black, and the hand feels astringent and jerking. It is a fake ash product.
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