Sodium triphosphate

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Sodium triphosphate
Sodium tripolyphosphate.svg
Names
IUPAC name
Pentasodium triphosphate
Other names
sodium tripolyphosphate, polygon, STPP
Identifiers
ECHA InfoCard 100.028.944 OOjs UI icon edit-ltr-progressive.svg
E number E451 (thickeners, ...)
PubChem CID
RTECS number
  • YK4570000
UNII
Properties
Na5P3O10
Molar mass 367.864 g/mol
Appearancewhite powder
Density 2.52 g/cm3
Melting point 622 °C (1,152 °F; 895 K)
14.5 g/100 mL (25 °C)
Hazards
NFPA 704 (fire diamond)
NFPA 704.svgHealth 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g. chloroformFlammability 0: Will not burn. E.g. waterInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
2
0
0
Flash point Non-flammable
Safety data sheet (SDS) ICSC 1469
Related compounds
Other anions
Trisodium phosphate
Tetrasodium pyrophosphate
Sodium hexametaphosphate
Other cations
Pentapotassium triphosphate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Sodium triphosphate (STP), also sodium tripolyphosphate (STPP), or tripolyphosphate (TPP), [1] ) is an inorganic compound with formula Na5P3O10. It is the sodium salt of the polyphosphate penta-anion, which is the conjugate base of triphosphoric acid. It is produced on a large scale as a component of many domestic and industrial products, especially detergents. Environmental problems associated with eutrophication are attributed to its widespread use. [2]

Contents

Preparation and properties

Sodium tripolyphosphate is produced by heating a stoichiometric mixture of disodium phosphate, Na2HPO4, and monosodium phosphate, NaH2PO4, under carefully controlled conditions. [2]

2 Na2HPO4 + NaH2PO4 → Na5P3O10 + 2 H2O

In this way, approximately 2 million tons are produced annually. [3]

STPP is a colourless salt, which exists both in anhydrous form and as the hexahydrate. The anion can be described as the pentanionic chain [O3POP(O)2OPO3]5−. [4] [5] Many related di-, tri-, and polyphosphates are known including the cyclic triphosphate (e.g. sodium trimetaphosphate). It binds strongly to metal cations as both a bidentate and tridentate chelating agent.

Chelation of a metal cation by triphosphate. Triphosphate chelation.svg
Chelation of a metal cation by triphosphate.

Uses

Detergents

The majority of STPP is consumed as a component of commercial detergents. It serves as a "builder", industrial jargon for a water softener. In hard water (water that contains high concentrations of Mg2+ and Ca2+), detergents are deactivated. Being a highly charged chelating agent, TPP5− binds to dications tightly and prevents them from interfering with the sulfonate detergent. [3]

Food

STPP is a preservative for seafood, meats, poultry, and animal feeds. [3] It is common in food production as E number E451. In foods, STPP is used as an emulsifier and to retain moisture. Many governments regulate the quantities allowed in foods, as it can substantially increase the sale weight of seafood in particular. The United States Food and Drug Administration lists STPP as Generally recognized as safe. [6]

Other

Other uses (hundreds of thousands of tons/year) include ceramics (decrease the viscosity of glazes up to a certain limit), leather tanning (as masking agent and synthetic tanning agent - SYNTAN), anticaking agents, setting retarders, flame retardants, paper, anticorrosion pigments, textiles, rubber manufacture, fermentation, antifreeze." [3] TPP is used as a polyanion crosslinker in polysaccharide based drug delivery. [7] Toothpaste may contain sodium triphosphate. [8] [9] [10] [11] [12] [13] [14]

Health effects

High serum phosphate concentration has been identified as a predictor of cardiovascular events and mortality. Whilst phosphate is present in the body and food in organic forms, inorganic forms of phosphate such as sodium triphosphate are readily adsorbed and can result in elevated phosphate levels in serum. [15] Salts of polyphosphate anions are moderately irritating to skin and mucous membranes because they are mildly alkaline. [1]

Environmental effects

Because it is very water-soluble, STPP is not significantly removed by waste water treatment. STPP hydrolyses to phosphate, which is assimilated into the natural phosphorus cycle. Detergents containing phosphorus contribute to the eutrophication of many fresh waters. [1]

The eutrophication of the Potomac River, caused from phosphate run-off, is evident from the bright green bloom of algae. Potomac green water.JPG
The eutrophication of the Potomac River, caused from phosphate run-off, is evident from the bright green bloom of algae.

See also

Related Research Articles

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<span class="mw-page-title-main">Phosphate</span> Chemical compound

In chemistry, a phosphate is an anion, salt, functional group or ester derived from a phosphoric acid. It most commonly means orthophosphate, a derivative of orthophosphoric acid, a.k.a. phosphoric acid H3PO4.

<span class="mw-page-title-main">Pyrophosphate</span> Class of chemical compounds

In chemistry, pyrophosphates are phosphorus oxyanions that contain two phosphorus atoms in a P−O−P linkage. A number of pyrophosphate salts exist, such as disodium pyrophosphate and tetrasodium pyrophosphate, among others. Often pyrophosphates are called diphosphates. The parent pyrophosphates are derived from partial or complete neutralization of pyrophosphoric acid. The pyrophosphate bond is also sometimes referred to as a phosphoanhydride bond, a naming convention which emphasizes the loss of water that occurs when two phosphates form a new P−O−P bond, and which mirrors the nomenclature for anhydrides of carboxylic acids. Pyrophosphates are found in ATP and other nucleotide triphosphates, which are important in biochemistry. The term pyrophosphate is also the name of esters formed by the condensation of a phosphorylated biological compound with inorganic phosphate, as for dimethylallyl pyrophosphate. This bond is also referred to as a high-energy phosphate bond.

<span class="mw-page-title-main">Toothpaste</span> Substance to clean and maintain teeth

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<span class="mw-page-title-main">Sodium phosphate</span> Sodium salts of phosphoric acid

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<span class="mw-page-title-main">Tetrasodium pyrophosphate</span> Chemical compound

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<span class="mw-page-title-main">Sodium trimetaphosphate</span> Chemical compound

Sodium trimetaphosphate (also STMP), with formula Na3P3O9, is one of the metaphosphates of sodium. It has the formula Na3P3O9 but the hexahydrate Na3P3O9·(H2O)6 is also well known. It is the sodium salt of trimetaphosphoric acid. It is a colourless solid that finds specialised applications in food and construction industries.

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References

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