1. Water-soluble: Take the chemical fertilizer granules of bean size into 20 ml test tube, add 10 ml of deionized water, shake for a few minutes and observe the dissolution condition. Generally, the crystalline fertilizer can be directly observed, and the powdered phosphate fertilizer should be identified. Water-soluble phosphorus can be quickly and easily prepared by means of a rapid measurement method.
2. Acidity and alkalinity: Take a small amount of the above solution in a small test tube and test it with litmus paper, or use a precision pH test paper.
3. Alkali surface reaction: In the acid-alkaline solution, after adding a spoonful of alkali surface, smell ammonia, to determine whether it is ammonium nitrogen fertilizer, if there is no ammonia smell, it can also be heated and then smelled to identify whether it is Urea fertilizer.
4, burning phenomenon: take a small amount of chemical fertilizer on iron or red charcoal burning, observe whether there is odor, whether smoke, whether it melts, with or without residue, with or without beating and flame color, using different salts or ions A characteristic phenomenon at the time of burning.
5, paper burning reaction: respectively, the various nitrogen fertilizer potassium fertilizer with tap water into a saturated solution, soak the paper strip saturated liquid, pick up and dry, ignite the paper strip to observe flammable, residue and so on.
Ionization: In the experiment, when identifying SO42-, the precipitation reaction was carried out. In the small test tube, 5 ml of the aqueous solution of the fertilizer was awaited, and a few drops of BaCl2 reagent or AgNO3 reagent were added to observe the presence or absence of white precipitate formation, which proved the existence of SO42-. It is added with BaCl2 to form a white precipitate which is insoluble in HCl. It was proved that the presence of Cl was caused by the addition of AgNO3 to form a white flocculent precipitate which was insoluble in HNO3.
Cold storage room fast door are used to industrial warehouse applications, our cold storage doors combine the latest technology, premium materials and design features to meet the demanding requirements of the cold storage industry. Available as a sliding, swing and vertical lift door, all Cold Guard doors incorporate a tough and thermally neutral fiberglass reinforced pultrusion framework, extruded plastic polymer casings and Non-CFC foamed-in place polyurethane core. We understand the conditions that cold storage doors must endure. Superior design methods and non-corrosive materials ensure that Cold Guard will perform and look good for years to come!
The advantages of cold storage fast room door
Excellent Insulation Properties
Save Money on Temperature Costs
A Variety of Cold Room Options
Temperature Control and Efficiency
One of the most important benefits of our cool room panels is passive temperature control.
Safety for You Too
Not only are our cold room panels very hygienic, they also allow for superior safety. Their low allergenic qualities and enhanced seismic performance will protect you while you`re at work.
Cold Storage Room Fast Door,Freezer Room Fast Door,Freezer Room Insulated Fast Door,Thick Curtain High Speed Door
Shenzhen Hongfa Automatic Door Co., Ltd. , https://www.hfgaragedoor.com