Brief identification of potassium dihydrogen phosphate

First, identify from the price. Where the market 400 grams / bag, the words "potassium dihydrogen phosphate" written, the pesticide store retail price of about 2 yuan, can be judged as counterfeit and inferior potassium dihydrogen phosphate.

Most of the content is zero, and some products are up to 15%, because the true potassium dihydrogen phosphate raw material 400 grams are much higher than 2 yuan, not to mention the finished product, the low price is not the manufacturer to make profits.

Second, identify from the taste. Buy potassium dihydrogen phosphate and take a few grains to taste it. It feels bitter. It is a fake potassium dihydrogen phosphate, which may be magnesium sulfate or chemical industry waste salt. It may be true that it is salty, but the salty taste is very heavy. The salty bitterness and the similar taste of salt may be sea salt, which is also fake. The true potassium dihydrogen phosphate is a light salty taste. Potassium dihydrogen phosphate, which smells odor (odor, ammonia, and even milky aroma), is false because the true potassium dihydrogen phosphate is a white, odorless crystal.

Third, from the outer packaging. 1. The Chinese character “potassium dihydrogen phosphate” must be marked on the package, and there should be a detailed factory name, site, telephone number, and implementation standard number. Others such as "composite type", "improved type", "potassium dihydrogen phosphate type", etc. are not genuine. 2. Write the words “potassium dihydrogen phosphate” very large, and the word “ammonium” is written very small; the small word “high-efficiency compound fertilizer (II) type” is marked on the upper right side of the package, and the middle part is marked with large characters. Potassium dihydrogen phosphate or potassium dihydrogen phosphate type II, these are deceiving the people. 3. In the description, the product is composed of nitrogen, phosphorus and potassium. It even contains trace elements such as boron, zinc and iron, regulators (hormone), growth factors, rare earth and other high-tech nouns. They are all fake and shoddy. Farmer's friend. It is well known that 98% potassium dihydrogen phosphate contains only phosphorus and potassium, and does not contain nitrogen or trace elements. There is no I, II, compound, composite or improved type in the national standard, so the content of the ingredients is marked as " Nitrogen, phosphorus, potassium, "complex", "containing trace elements", "rare earth", "composite", "improved" potassium dihydrogen phosphate can be regarded as fakes. 4. The liquid bottled liquid potassium dihydrogen phosphate is distributed in the market. It does not conform to the requirements of the “appearance of white crystal or powder” on the HG2321-1992 standard, and according to the relevant regulations of the state, there is no liquid potassium dihydrogen phosphate. The product does not meet the requirements of the Ministry of Agriculture's fertilizer registration at all, and production is not allowed. It can be regarded as a fake. 5, the packaging is simple, rough, the name of the factory, the site is unknown, the name of the factory is used, the phone can't get through, and it also indicates "pure", "high purity", "import", "authentic", "complex", "improved" "Nano" and other terms can be regarded as fakes.

Fourth, the technical identification: 1, take a little on the iron sheet heating, dissolved into a transparent liquid, cooled to solidify into a translucent glassy material is the real thing. If the appearance is white crystal or powder, a small amount of exposure to sunlight, the nature of the traits and color does not change can be considered as the real thing, if it is changed, it is doubtful. 2, take a glass, go to a large half of warm water, put 50 grams of soda ash into the water, then stir until the soda is completely dissolved, take 10 grams of potassium dihydrogen phosphate into the soda solution, if there are a lot of bubbles, it is the real thing, If there are a lot of flocculent precipitates or other reactions, it means that they are fake and shoddy products. 3, with fire, if there is the taste of ammonia, are fake and shoddy products. Potassium dihydrogen phosphate does not contain nitrogen, and there is no pungent ammonia smell when burned. 4. The addition of zinc sulfate and ferrous sulfate to the aqueous solution of potassium dihydrogen phosphate will cause precipitation. If magnesium sulfate is used to sham, the aqueous solution will not precipitate after adding zinc sulfate or ferrous sulfate.

5. Look for the brand and ask for evidence. When buying potassium dihydrogen phosphate, you must remember to ask for valid evidence from the farmer's shop. If you have some questions about the product, or suspected fake goods, you can find the relevant local agricultural technology department for identification. The purchase volume is large and can be provided to the inspection agency. , to distinguish between true and false.
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