Simple identification of true and false chemical fertilizers

February 08, 2020

First, the identification of urea. Urea is the largest and most widely used chemical fertilizer in rural areas in China. The true and false identification methods are as follows: First, real urea is white or yellowish-white needles, spindles or round granular crystals, odorless, and completely soluble in water. , otherwise fake urea. The second is to take a little sample and put it into lime water. If you can't smell ammonia, it's true urea. Nitrogen fertilizers that can smell ammonia are other fertilizers or other substances that are mixed with nitrogen fertilizers. The third is to ignite a few pieces of charcoal, or to burn red iron or tile, put a little urea on it and burn it, emit white smoke, pungent ammonia smell, and quickly turn into water, true urea; When it is burned, it is slightly boiled, and it emits a buzzing sound, indicating that ammonium sulfate is mixed as a bad product. If a hydrochloric acid smell is emitted, it shows that it contains ammonia chloride; if it is burned, a slight flame occurs. , which is mixed with ammonium nitrate.
Second, the identification of compound fertilizer. Now the amount of compound fertilizer is getting bigger and bigger, and its use is getting wider and wider. There are four ways to identify it: First, take a small amount of compound fertilizer at random, let it fall freely at a height of 1.5 meters from the ground, repeat 2-3 Secondly, the tip of the sound that comes out of the ground is a fake, and the sound is genuine. The second is to take a little compound fertilizer into a damp plate, let it absorb moisture for 6-8 minutes, and it is a fake product that absorbs moisture quickly. The third is to identify the authenticity of the use of different proportions, the same is 25 kg of compound fertilizer, the volume of the original product is relatively small, the size of fake and inferior fertilizer is bigger, looks much more loaded. The fourth is to take a few samples into the water, can be completely melted as genuine, otherwise it is shoddy products.
Third, the identification of ammonium bicarbonate. This type of fertilizer has a large amount and is cheaper. There are two ways to identify it: First, take a small amount of sample and put it on a concave piece of iron or tile to burn it. It will not evaporate and evaporate or decompose directly. It is ammonium bicarbonate or ammoniation. Ammonium; If melt-forming fluids or semi-liquids are produced, it indicates that the fertilizer is not pure and is blended with fertilizer such as calcium ammonium nitrate or ammonium nitrate. The second is white or light yellowish white powder or granular crystals, smelling a pungent smell of ammonia, dissolved in water, there is a larger ammonia taste, this is true ammonium bicarbonate, and vice versa is a shoddy product.
Fourth, the identification of ammonium sulfate. (1) The authenticity is white or light gray crystal, also blue or light red, odorless or bitter and salty, completely soluble in water. (2) Take a few samples on burnt iron or tile, neither melting nor burning, can smell ammonia smell, there are black marks on the iron pieces, which proves to be ammonium sulfate, otherwise it is inferior products.
Fifth, the identification of ammonium nitrate. (1) The genuine product is white or yellow or yellow-white crystal (grainy), odorless, completely soluble in water, and mostly packed in thick kraft paper. (2) Take a little sample and put it on a piece of iron to burn it. It immediately dissolves, has a red flame and emits ammonia smell. It is ammonium nitrate, otherwise it is a fake product. (3) take a few products soluble in water, and then pour this solution into a white porcelain dish or white bowl, add 4 drops of diphenylamine solution, become blue for the authentic product, and vice versa for the inferior product.

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