Potassium dihydrogen phosphate (chemical formula: KH2PO4) is sealed and stored. It is stable in the air. It loses water at ℃ and becomes metaphosphate. It is used to prepare buffer solutions, determine arsenic, antimony, phosphorus, aluminum and iron, and prepare phosphorus. Standard solution, prepare culture medium, and measure inorganic phosphorus and alkaline phosphatase activity in serum.
[Physical and chemical properties]
Colorless tetragonal crystal or white crystalline powder. Relative density 2.338. Melting point 252.6℃. Soluble in water Nanya epoxy resin (83.5g/100ml water at 90℃), the aqueous solution is acidic, the pH value of 1% potassium dihydrogen phosphate solution is 4.6. Insoluble in alcohol. Deliquescent. It melts into a transparent liquid when heated to ℃, and solidifies into opaque glassy potassium metaphosphate when cooled.
【Purpose】
In industry, it is used as a buffer and culture agent; in agriculture, it is used as a high-efficiency phosphorus-potassium compound fertilizer; in food grade, it is used as a food improvement additive.
Potassium dihydrogen phosphate is colorless tetragonal crystal or white crystalline powder. Relative density 2.338. Melting point 252.6℃. It is easily soluble in water. At 90°C, the solubility is 83.5g/100ml water. The aqueous solution is acidic. The pH value of 1% potassium dihydrogen phosphate solution is 4.6. Insoluble in alcohol. Deliquescent. It melts into a transparent liquid when heated to ℃, and solidifies into opaque glassy potassium metaphosphate when cooled.
In agriculture, it is used as a high-efficiency phosphorus-potassium compound fertilizer; potassium dihydrogen phosphate products are widely used in various types of cash crops, grains, fruits, vegetables, etc. The station and other expert institutions have conducted many relevant application experiments on the suitability of potassium dihydrogen phosphate for various types of typical crops. The actual application effects of potassium dihydrogen phosphate on various types of crops in various places have proven that potassium dihydrogen phosphate can significantly increase production and income, improve quantity and quality, and resist lodging. It has many excellent functions such as resistance to diseases and insect pests, prevention and treatment of premature aging, etc., and has the function of overcoming nutrient deficiencies caused by the aging and reduced absorptive capacity of the root system in the later stages of crop growth. Potassium dihydrogen phosphate is a new type of high-concentration phosphorus and potassium two-element compound fertilizer, which contains about 52% phosphorus pentoxide and about 34% potassium oxide. Flue-cured tobacco requires large amounts of phosphorus and potassium, especially potassium. Potassium dihydrogen phosphate is an ideal new fertilizer for flue-cured tobacco. In order to explore the use value and application method of potassium dihydrogen phosphate in flue-cured tobacco to improve the quality of tobacco leaves. Potassium dihydrogen phosphate is used on cotton to control excessive cotton growth and increase the number of buds on the plant. Potassium dihydrogen phosphate is widely used in dripper sprinkler irrigation systems.
Some criminals use potassium sulfate, sodium sulfate, etc. as counterfeit potassium dihydrogen phosphate, making it difficult for farmers to distinguish the authenticity when purchasing. Potassium sulfate and sodium sulfate have a white appearance, while potassium dihydrogen phosphate crystals are transparent, so they can be easily identified by their appearance.
Note:
1. This product can be mixed with neutral and acidic pesticides and fertilizers (except where mixed application is prohibited).
2. Store this product in a cool, dry place. The shelf life is five years.
3. This product is a high-purity product, please do not increase the dosage at will.
4. This product is hygroscopic, but it does not affect the quality and effectiveness.
Application on wheat and other crops:
1. For sandy soils and loamy soils that are relatively deficient in phosphorus and potassium during the application period, potassium dihydrogen phosphate can be applied at the bottom during soil preparation. Before sowing, pigment carbon black can be soaked with potassium dihydrogen phosphate solution. During the peak tillering period of wheat, Topdress potassium dihydrogen phosphate during the greening stage, jointing stage, booting stage and grain filling stage, of which it must be applied during the grain filling stage. For medium soil and clay soil with high phosphorus and potassium content, potassium dihydrogen phosphate solution can be used for seed soaking and topdressing during the jointing stage, booting stage and grain filling stage.
2. Application concentration (1) Basic application. Potassium dihydrogen phosphate is used as the base fertilizer, 8 to 10 kilograms per acre is suitable, and 25 kilograms of urea is applied together to achieve a balanced ratio of nitrogen, phosphorus, and potassium. (2) Soaking seeds. Just use 200 grams of potassium dihydrogen phosphate per acre. (3) Foliar spraying. Apply 300 to 700 grams per acre, 40 to 60 kilograms of water, and the spray concentration is 0.8% to 1%.
3. Application method When applying base fertilizer, potassium dihydrogen phosphate and fine soil should be mixed evenly, then spread evenly during plowing, or mixed with nitrogen fertilizer before application, and rake evenly after application. To soak the seeds, mix the water evenly according to the required amount of potassium dihydrogen phosphate so that the liquid level in the container is 5 cm higher than the seeds. Soak the seeds for 10 hours. Take them out and dry them before sowing. For foliar spraying, the correct potassium dihydrogen phosphate solution should be sprayed evenly on the leaves before 10 a.m. or after 4 p.m. on a windless and sunny day.
The difference between potassium dihydrogen phosphate, tripotassium phosphate, dipotassium hydrogen phosphate and potassium formate!
1. Tripotassium phosphate is a chemical substance with the molecular formula K3PO4.
Characteristics: colorless orthorhombic crystals or white crystalline powder.
Melting point 1340℃
Relative density 2.564
Solubility Soluble in water, insoluble in alcohol. The aqueous solution is strongly alkaline.
Uses: Used in the manufacture of liquid soap, high-quality paper, refined gasoline; used in the food industry as emulsifiers, fortifiers, seasonings, meat binders; and also used as fertilizers.
2. Dipotassium hydrogen phosphate, also known as dipotassium hydrogen phosphate trihydrate, molecular formula: K2HPO4·3H2O, appears as white crystal or amorphous white powder, easily soluble in water, the aqueous solution is slightly alkaline, and slightly soluble in alcohol. It is hygroscopic and will dissolve automatically at higher temperatures. The relative density is 2.338. At 204°C, the molecule is dehydrated and converted into potassium pyrophosphate. The pH value of a 1% aqueous solution is 8.9. Mainly used in medicine, fermentation, bacterial culture and preparation.��Potassium phosphate, etc.
Purpose:
1. Used as corrosion inhibitor for antifreeze, nutrient for antibiotic culture medium, phosphorus and potassium regulator in fermentation industry, feed additive, etc. Used as water quality treatment agent, microorganism, fungus culture agent, etc. In the food industry, it is used as raw material for preparing alkaline water for pasta products, fermentation agent, flavoring agent, leavening agent, mild alkaline agent for dairy products, and yeast food. Used as buffering agent and chelating agent.
2. In the food industry, it is used as raw material for preparing alkaline water for pasta products, fermentation agent, flavoring agent, leavening agent, mild alkaline agent for dairy products, and yeast food. Used as buffer chelating agent. It can also be used as feed additive.
3. Dipotassium hydrogen phosphate is used as a buffer in chemical analysis, in the phosphating treatment of metals and as an electroplating additive.
