Sodium dihydrogen phosphate CAS 13472-35-0

What is Sodium Dihydrogen Phosphate?

Sodium Dihydrogen Phosphate is an inorganic salt composed of sodium ions and dihydrogen phosphate ions, belonging to the acid phosphate family of sodium phosphates.

Its anhydrous chemical formula is usually:

NaH₂PO₄​​​

in:

· Na+ and Na + represent sodium ions;

· H2PO4−H 2 ​PO 4 −​ represents the dihydrogen phosphate ion.

In water, it can usually dissociate into:

NaH2PO4→Na++H2PO4− NaH 2 ​PO 4 ​→ Na + +H 2 ​PO 4−

Understanding from the name:

· Sodium indicates sodium;

· Dihydrogen Phosphate represents dihydrogen phosphate;

· Therefore, Sodium Dihydrogen Phosphate is the dihydrogen phosphate salt of sodium.

It often refers to the same type of substance as the following English names:

· Sodium Dihydrogen Phosphate;

· Sodium Phosphate Monobasic;

· Monosodium Phosphate;

· Sodium Acid Phosphate;

· MSP.

Sodium Dihydrogen Phosphate typically has the following characteristics:

· White or off-white powder/granules/crystals ;

· Easily soluble in water ;

· The aqueous solution is acidic or weakly acidic ;

· It can provide sodium ions and dihydrogen phosphate ions ;

· It has pH adjustment capabilities ;

· It can participate in phosphate buffer systems ;

· It can form a buffer pair with disodium hydrogen phosphate ;

· It can be used in food, pharmaceutical, laboratory, feed, agricultural and industrial fields ;

· Different grades cannot be arbitrarily substituted .

What are the uses of Sodium Dihydrogen Phosphate?

In addition to industrial applications, Sodium Dihydrogen Phosphate also has important uses in the food, pharmaceutical, laboratory, feed, and agricultural sectors.

1. pH adjusters and buffers

Sodium Dihydrogen Phosphate is an acidic phosphate that can combine with other phosphates such as disodium hydrogen phosphate to form a buffer system.

Main function:

· Adjust the pH of the system;

· Stabilize acid and alkaline environments;

· Buffer pH fluctuations;

· Improve the stability of the reaction system;

· Improve the repeatability of industrial processes.

Possible applications:

· Industrial formulation;

· Cleaning agent;

· Water treatment;

· Dyeing and finishing processes;

· Chemical reaction system;

· Industrial experimental buffer solution.

2. Industrial cleaning agents

In industrial cleaning, Sodium Dihydrogen Phosphate can be used as an acidic salt, pH adjuster, or buffer component.

Main function:

· Stabilize the pH of the cleaning solution;

· It helps remove inorganic dirt;

· Improve surfactant performance;

· Reduce the impact of mineral deposition;

· Improve the stability of the cleaning system;

· Supports mild acidic cleaning environments.

Possible applications:

· Equipment cleaning;

· Pipe cleaning;

· Metal cleaning;

· Hard surface cleaning;

· Workshop maintenance and cleaning;

· Industrial descaling formula.

3. Metal Surface Treatment

Sodium Dihydrogen Phosphate can be used in metal surface treatment solutions for pH adjustment, cleaning, rust removal, or phosphate treatment.

Main function:

· Adjust the acidity of the treatment solution;

· Assists in cleaning metal surfaces;

· Improve the environment for rust and scale removal;

· Provides conditions for phosphating or pre-coating treatment;

· Improves the adhesion of subsequent coatings;

· Stabilized metal treatment formulation.

Possible applications:

· Pretreatment before electroplating;

· Pre-treatment before spraying;

· Metal cleaning;

· Rust removal and cleaning;

· Hardware processing;

· Automotive parts processing;

· Surface treatment of steel structures.

4. Water treatment and boiler treatment

In the field of water treatment, phosphates are commonly used for pH adjustment, buffering, scale inhibition, precipitation control, and system stabilization. Sodium Dihydrogen Phosphate can be used as a compound component.

Main function:

· Adjusting the pH of the water;

· Participating in phosphate buffer systems;

· It reacts with calcium and magnesium ions;

· Aids in controlling limescale;

· Improve the stability of water treatment agents;

· Supports pH adjustment in wastewater treatment.

Possible applications:

· Industrial circulating water;

· Boiler water treatment;

· Cooling water system;

· Process water;

· Industrial wastewater;

· Treatment of cleaning waste liquid.

5. Textile printing and dyeing auxiliaries

In textile printing and dyeing processes, Sodium Dihydrogen Phosphate can be used to adjust the pH of the dye bath or stabilize the dyeing and finishing system.

Main function:

· Control the pH of the dye bath;

· Stabilize the dye system;

· Reduce color difference;

· Improve staining uniformity;

· Improve process repeatability;

· Supports the stability of printing pastes.

Possible applications:

· Dyeing process;

· Printing process;

· Fiber pretreatment;

· Post-finishing processes;

· Textile auxiliary formulation.

6. Food-grade applications

Food-grade Sodium Dihydrogen Phosphate can be used as a food additive.

Main functions:

· Acidity regulator;

· pH buffer;

· Stabilizer;

· Leavening agent auxiliary components;

· Emulsified salt components;

· Components of the moisture retention system;

· Compound food additive ingredients.

Possible applications:

· drinks;

· Solid beverages;

· Baked goods;

· Cake premix powder;

· Dairy products;

· Processed cheese;

· Meat products;

· Processed aquatic products;

· Seasonings and sauces.

In baking systems, acidic phosphates can react with sodium bicarbonate to produce carbon dioxide:

H++HCO3−→CO2↑+H2O H + +HCO 3− ​→ CO 2 ​↑ +H 2 ​O

This helps the product to expand.

7. Reagent Grade and Laboratory Use

Sodium Dihydrogen Phosphate is one of the most common buffer salts used in laboratories.

Main functions:

· Prepare phosphate buffer solution;

· Prepare PBS;

· Adjust the pH of the experimental system;

· Stabilize protein or enzyme reaction systems;

· Used as a chromatographic mobile phase;

· Analytical chemical reagents.

Possible applications:

· Biochemical experiments;

· Molecular biology experiments;

· Cell experiments;

· Protein purification;

· HPLC analysis;

· Teaching experiments;

· Scientific research testing.

Common buffer systems are often regulated by a combination of Sodium Dihydrogen Phosphate and Disodium Hydrogen Phosphate.

8. Feed-grade applications

Feed-grade Sodium Dihydrogen Phosphate can be used in animal nutrition systems.

Main functions:

· Provide phosphorus source;

· Provide a sodium source;

· Adjusting the pH of feed;

· Involved in mineral premixes;

· Supports animal bones and metabolism;

· Improve the balance of feed formulation.

Possible applications:

· Livestock and poultry feed;

· Aquatic feed;

· Pet food;

· Animal mineral premix;

· Feed additives;

· Feed acidification system.

When applying feed, attention should be paid to the animal species, phosphorus-sodium ratio, fluorine content, heavy metals, and feed regulations.

9. Agricultural applications

Agricultural-grade Sodium Dihydrogen Phosphate can be used as a phosphorus source or a water-soluble phosphate feedstock.

Main functions:

· Provides phosphorus;

· Adjust the pH of the nutrient solution;

· Used in water-soluble fertilizer formulations;

· Participate in soilless culture nutrient solution;

· As a component of foliar fertilizer formulations;

· Used in horticultural nutrient systems.

Possible applications:

· Water-soluble fertilizer;

· Foliar fertilizer;

· Horticultural fertilizers;

· Soilless cultivation;

· Greenhouse nutrient solution;

· Plant nutrition research.

It should be noted that Sodium Dihydrogen Phosphate contains sodium, and long-term, large-scale agricultural use may increase the sodium burden on the soil. Therefore, its agricultural use should be carefully evaluated.

10. Ceramics, glass and materials processing

In the field of materials processing, Sodium Dihydrogen Phosphate can be used as a phosphate additive, pH adjuster, or reactant.

Main function:

· Adjust the pH of the slurry;

· Improve the dispersion of inorganic powders;

· Incorporate into ceramic or glass formulations;

· Introduced into the material system as a phosphorus source;

· Improve material processing stability;

· Assisted surface modification.

Possible applications:

· Ceramic preparation;

· Glaze processing;

· Specialty glass;

· Inorganic powder dispersion;

· Material modification;

· Industrial slurry systems.

Summarize

Sodium dihydrogen phosphate , also known as sodium acid phosphate , monosodium phosphate , or sodium acid phosphate , is a sodium acid phosphate salt. Common forms include:

· Anhydrous substance: NaH2PO4

· Monohydrate: NaH2PO4⋅H2O

· Dihydrate: NaH2PO4⋅2H2O

It is readily soluble in water, and its aqueous solution is acidic or weakly acidic. It has functions of pH adjustment, buffering, stabilization, and phosphate reaction.

We may come into contact with Sodium Dihydrogen Phosphate in our daily lives through the following means:

· Food and beverages;

· Pharmaceuticals and pharmaceutical preparations;

· Laboratory and research supplies;

· Pet food and animal feed;

· Agricultural fertilizers and nutrient solutions;

· Cleaning products and water treatment products.

In addition to industrial applications, Sodium Dihydrogen Phosphate is also widely used in:

· Food grade: Acidity adjustment, buffering, stabilization, and leavening aid;

· Pharmaceutical grade: pharmaceutical excipients, buffers, electrolyte components;

· Reagent grade: Phosphate buffer, PBS, biochemical experiments;

· Feed grade: Animal phosphorus and sodium source;

· Agricultural grade: Water-soluble fertilizer, foliar fertilizer and nutrient solution formulations.

Finally, it is important to emphasize that the hydration form and product grade of Sodium Dihydrogen Phosphate are crucial. Before use, it should be confirmed whether it is anhydrous, monohydrate, or dihydrate, and the appropriate conversion should be made based on the effective content. Furthermore, the corresponding grade should be selected according to the intended use in food, pharmaceuticals, reagents, feed, agriculture, or industry to avoid misuse or mixing.