HomeMCPWorkbenchSkills
HomeWorkbenchNotificationsMe
llms.txt · MCP GuidePrivacy Policy · Terms of Service · Supportv1.8.0
  1. Home
  2. /Compound

Tetrasodium Pyrophosphate

HCID 24403
New noteNew reactionRequest quotes
Print preview

Completing data — refresh the page later to see the latest

Basic informationOverviewNames & identifiersPropertiesSafety & regulationChemistry & industryRelated reactionsCompound notes
Substructure searchFind similar structures

Basic information

CAS
1004291-85-3
Standard SMILES
O=P([O-])([O-])OP(=O)([O-])[O-].[Na+].[Na+].[Na+].[Na+]
InChIKey
FQENQNTWSFEDLI-UHFFFAOYSA-J
Molecular formula
Na4P2O7
Average molar mass
265.9 g/mol
Monoisotopic mass
265.87100272

Overview

Tetrasodium pyrophosphate appears as odorless, white powder or granules. mp: 995 °C. Density: 2.53 g/cm3. Solubility in water: 3.16 g/100 mL (cold water); 40.26 g/100 mL boiling water. Used as a wool de-fatting agent, in bleaching operations, as a food additive. The related substance tetrasodium pyrophosphate decahydrate (Na4P2O7*10H2O) occurs as colorless transparent crystals. Loses its water when heated to 93.8 °C.

Names & identifiers

Preferred name
Tetrasodium Pyrophosphate
IUPAC
tetrasodium;phosphonato phosphate
English name
Pd (0) divinyltetramethyldisiloxan di-mesityl-imidazolidin yliden
Molecular formula
C29H40N2OPdSi2
Molecular weight
595.24

Names & synonyms

Sodium pyrophosphateTETRASODIUM PYROPHOSPHATE7722-88-5TSPPTetrasodium diphosphatePhosphotexDiphosphoric acid, tetrasodium saltSodium diphosphateVictor TSPPNatrium pyrophosphatSodium diphosphate, anhydrousPyrophosphoric acid tetrasodium salt
Show more names
Pd (0) divinyltetramethyldisiloxan di-mesityl-imidazolidin yliden1,3-Bis(2,4,6-trimethylphenyl)-2-imidazolidinylidene][1,3-divinyl-1,1,3,3-tetramethyldisiloxane]palladium(0)
Sodium phosphate (Na4P2O7)Sodium diphosphate (Na4P2O7)Sodium pyrophosphate, tetrabasicDTXSID9042465Sodium pyrophosphate (Na4P2O7)Anhydrous tetrasodium pyrophosphateTetrasodium pyrophosphate, anhydrousPyrophosphoric acid, tetrasodium salt

Database identifiers

CAS
1004291-85-3、7722-88-5
PubChem CID
24403

Properties

Computed structural propertiesFilling in

Topological polar surface area
136 Ų
Hydrogen bond donors
0
Hydrogen bond acceptors
7
Rotatable bonds
0
Heavy atoms
13
Formal charge
0
Complexity
124

Experimental & physicochemical properties

Chemical ClassesOther Classes -> Salts, Basic
Cosmetics · 2 items

Cosmetic ingredients (Tetrasodium Pyrophosphate) -> CIR (Cosmetic Ingredient Review)

Chelating; Anticaking; Buffering

pH · 2 items

Between 9,8 and 10,8 (1 % solution)

10.2 (1% SOLN)

OdorOdorless.
Food AdditivesANTICAKING AGENT OR FREE-FLOW AGENT, DRYING AGENT, EMULSIFIER OR EMULSIFIER SALT, FORMULATION AID, HUMECTANT, PH CONTROL AGENT, SEQUESTRANT, STABILIZER OR THICKENER -> FDA Substance added to food
Density · 5 items

2.45 (NIOSH, 2024) - Denser than water; will sink

2.534

Relative density (water = 1): 2.5

2.534 @25 °C

2.45

Color/Form · 3 items

CRYSTALS

COLORLESS, TRANSPARENT CRYSTALS OR WHITE POWDER

White powder or granules.

Solubility · 6 items

7 % at 77 °F (NIOSH, 2024)

Safety & regulation

Safety information is for reference only and does not replace the supplier’s Safety Data Sheet (SDS), applicable regulations, or professional assessment.

GHS classification

GHS Classification · 6 items

This chemical does not meet GHS hazard criteria for 6.2% (95 of 1523) of reports.

Danger

H302 (51.1%): Harmful if swallowed [Warning Acute toxicity, oral]

P261, P264, P264+P265, P270, P271, P280, P301+P317, P302+P352, P304+P340, P305+P351+P338, P305+P354+P338, P317, P319, P321, P330, P332+P317, P337+P317, P362+P364, P403+P233, P405, and P501 (click each P-code to see the statement)

Aggregated GHS information provided per 1523 reports by companies from 28 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.

Warning

Hazard information

Regulatory Information · 4 items

Chemical: Diphosphoric acid, tetrasodium salt

Diphosphoric acid, sodium salt (1:4) is listed on the EPA's Chemical Data Reporting (CDR) system. Manufacturers and importers of Diphosphoric acid, sodium salt (1:4) are required to report information about their production and use of this chemical to the EPA under the Toxic Substances Control Act (TSCA). (40 eCFR Part 711)

Status: Active Update: 03-12-2021 https://echa.europa.eu/registration-dossier/-/registered-dossier/14859

Tetrasodium pyrophosphate: Does not have an individual approval but may be used under an appropriate group standard

Other Safety InformationIMAP assessments - Diphosphoric acid, tetrasodium salt: Human health tier I assessment
Fire HazardsNot combustible. Gives off irritating or toxic fumes (or gases) in a fire.
Health HazardsExcerpt from NIOSH Pocket Guide for Tetrasodium pyrophosphate:
Hazards SummaryDocumentation and TLV withdrawn in 2006 because of insufficient data; [ACGIH] A skin, eye, and respiratory tract irritant; [ICSC]

Chemistry & industry

Pharmacology

Mechanism of Action · 1 item

ARSONIC ACID HERBICIDES ARE NOT GROWTH REGULATORS IN SENSE OF PLANT HORMONES. THEY ... ACT THROUGH ENZYME SYSTEMS TO INHIBIT GROWTH. THEY KILL ... SLOWLY; FIRST SYMPTOMS ARE ... CHLOROSIS, CESSATION OF GROWTH, & GRADUAL YELLOWING, THEN BROWNING FOLLOWED BY DEHYDRATION & DEATH. /ORGANOARSENICAL HERBICIDES/

Metabolism/MetabolitesPyrophosphate is hydrolyzed to the orthophosphate in the gut.

Uses & manufacturing

Uses · 6 items

CIR ingredient: Tetrasodium Pyrophosphate

Used as a water softener, detergent, emulsifying agent, metal cleaner, and nutritional supplement; [ACGIH]

Acid and Alkali Cleaning of Metals [Category: Clean]

The active ingredient is no longer contained in any registered products ... "cancelled."

IN CLEANING CMPD, OIL-WELL DRILLING, WATER TREATMENT, CHEESE EMULSIFICATION; AS GENERAL SEQUESTERING AGENT, TO REMOVE RUST STAINS; AS INGREDIENT OF ONE-FLUID INK ERADICATORS, IN ELECTRODEPOSITION OF METALS

TEXTILE DYEING; SCOURING OF WOOL; BUFFER; SEQUESTRANT; NUTRIENT SUPPLEMENT; FOOD ADDITIVE

U.S. Exports · 2 items

(1972) No Data

(1975) No Data

U.S. Imports · 2 items

(1972) No Data

(1975) No Data

U.S. Production · 3 items

2023: 10,000,000 - <50,000,000 lb

(1972) 4.21X10+10 GRAMS

(1975) 3.1X10+10 GRAMS

Consumption Patterns · 1 item

65-69% USED IN INDUSTRIAL & INSTITUTIONAL DETERGENT BUILDERS & WATER TREATMENT APPLICATIONS; 13-15% USED IN CLAY PROCESSING; 3-5% IN FOOD & ALLIED PRODUCTS (OTHER THAN DAIRY); 1% IN DAIRY & ALLIED PRODUCTS; 13% IN MISC APPLICATIONS INCLUDING HOME LAUNDRY DETERGENTS, TEXTILES, ELASTOMERS, IN PAPER PROCESSING(1973)

Related reactions

22 records
New reaction record
HRID 1945 reaction equation
HRID 1945As reactantuspto-grants-1998_03
HRID 247361 reaction equation
HRID 247361As productuspto-grants-1987_11
HRID 270753 reaction equation
HRID 270753As reactantuspto-grants-2008_11
HRID 337397 reaction equation
HRID 337397As reactantuspto-grants-2014_11
HRID 460399 reaction equation
HRID 460399As reactantuspto-grants-2007_03
HRID 460400 reaction equation
HRID 460400As reactantuspto-grants-2007_03
HRID 484922 reaction equation
HRID 484922As reactantuspto-grants-1985_08
HRID 488015 reaction equation
HRID 488015As reactantuspto-grants-1994_03
Page 1 of 3

Compound notes

Loading…

On this pageBasic informationOverviewNames & identifiersPropertiesSafety & regulationChemistry & industryRelated reactionsCompound notes
More actions
New noteNew reactionRequest quotes
DTXSID
DTXSID9042465
ChEMBL
CHEMBL450079
ChEBI
CHEBI:71240
UNII
O352864B8Z
EC Number
231-767-1、664-473-0
Nikkaji
J9.299A

Soluble in water. Insoluble in ethanol

COLORLESS, MONOCLINIC CRYSTALS; INSOL IN AMMONIA /DECAHYDRATE/

INSOL IN ALCOHOL /DECAHYDRATE/

SOLUBILITY IN WATER: 3.16 G/100 ML @ 0 °C; 6.23 G/100 ML @ 20 °C; 8.14 G/100 ML @ 25 °C; 21.83 G/100 ML @ 60 °C; 30.04 G/100 ML @ 80 °C /DECAHYDRATE/

IN WATER: 2.61 G/100 ML @ 0 °C; 6.7 G/100 ML @ 25 °C; 42.2 G/100 ML @ 100 °C

Boiling Point · 2 items

Decomposes (NIOSH, 2024)

Decomposes

DecompositionWhen heated to decomp ... emits toxic fumes of /phosphorus oxides/.
Melting Point · 5 items

1810 °F (NIOSH, 2024)

988 °C

988 °C

993 °C

1810 °F

Vapor Pressure · 2 items

0 mmHg (approx) (NIOSH, 2024)

0 mmHg (approx)

Physicochemical properties

Symbol(GHS)
7 · GHS07
Signal word
Warning
Hazard statements
302 · H302-H413-H332-H319-H315-H312
Precautionary statements
264 · P264-P270-P301+P312-P330-P501-P261-P271-P304+P340-P312-P264-P280-P302+P352-P321-P332+P313-P362-P280-P302+P352-P312-P322-P363-P501-P264-P280-P305+P351+P338-P337+P313P
FDA Requirements · 2 items

Tetrasodium pyrophosphate used as a sequestrant in food for human consumption is generally recognized as safe when used in accordance with good manufacturing practice.

Tetrasodium pyrophosphate used as a sequestrant in animal drugs, feeds, and related products is generally recognized as safe when used in accordance with good manufacturing or feeding practice.

Reactive GroupAnhydrides
EPA Safer ChemicalChemical: Sodium pyrophosphate
FIFRA Requirements · 2 items

As the federal pesticide law FIFRA directs, EPA is conducting a comprehensive review of older pesticides to consider their health and environmental effects and make decisions about their future use. Under this pesticide reregistration program, EPA examines health and safety data for pesticide active ingredients initially registered before November 1, 1984, and determines whether they are eligible for reregistration. In addition, all pesticides must meet the new safety standard of the Food Quality Protection Act of 1996. Pesticides for which EPA had not issued Registration Standards prior to the effective date of FIFRA, as amended in 1988, were divided into three lists based upon their potential for human exposure and other factors, with List B containing pesticides of greater concern and List D pesticides of less concern. Tetrasodium pyrophosphate is found on List D. Case No: 4053; Pesticide type: fungicide, herbicide, antimicrobial; Case Status: None of the active ingredients in the case are being supported for reregistration by their registrants. All are unsupported, or some are unsupported and some are cancelled. Cases described as "unsupported" generally are being processed for cancellation.; Active ingredient (AI): Tetrasodium pyrophosphate; AI Status: The active ingredient is no longer contained in any registered products ... "cancelled."

Residues of tetrasodium pyrophosphate are exempted from the requirement of a tolerance when used as a anticaking agent or conditioning agent in accordance with good agricultural practices as inert (or occasionally active) ingredients in pesticide formulations applied to growing crops or to raw agricultural commodities after harvest.

Reactivity ProfileTETRASODIUM PYROPHOSPHATE is basic. Reacts exothermically with acids. Incompatible with strong oxidizing agents. Decomposes in ethyl alcohol.
Chemical DangersDecomposes on burning. The solution in water is a weak base.
Flammable LimitsNoncombustible Solid

Safety & protection

Fire FightingIn case of fire in the surroundings, use appropriate extinguishing media.
First Aid Measures · 4 items

Fresh air, rest. Refer for medical attention.

Remove contaminated clothes. Rinse and then wash skin with water and soap.

First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then refer for medical attention.

Rinse mouth. Refer for medical attention .

First Aid · 2 items

Excerpt from NIOSH Pocket Guide for Tetrasodium pyrophosphate:

(General first aid procedures)

Disposal Methods · 1 item

SRP: At the time of review, criteria for land treatment or burial (sanitary landfill) disposal practices are subject to significant revision. Prior to implementing land disposal of waste residue (including waste sludge), consult with environmental regulatory agencies for guidance on acceptable disposal practices.

Spillage Disposal · 1 item

Sweep spilled substance into covered containers. If appropriate, moisten first to prevent dusting. Wash away remainder with plenty of water. Personal protection: particulate filter respirator adapted to the airborne concentration of the substance.

Preventive Measures · 3 items

The worker should immediately wash the skin when it becomes contaminated.

Work clothing that becomes wet or significantly contaminated should be removed and replaced.

Workers whose clothing may have become contaminated should change into uncontaminated clothing before leaving the work premises.

Eye PreventionWear safety spectacles.
Inhalation RiskEvaporation at 20 °C is negligible; a harmful concentration of airborne particles can, however, be reached quickly , especially if powdered.
Skin PreventionProtective gloves.
Exposure PreventionPREVENT DISPERSION OF DUST!
Allowable Tolerances · 1 item

Residues of tetrasodium pyrophosphate are exempted from the requirement of a tolerance when used as a anticaking agent or conditioning agent in accordance with good agricultural practices as inert (or occasionally active) ingredients in pesticide formulations applied to growing crops or to raw agricultural commodities after harvest.

Ingestion PreventionDo not eat, drink, or smoke during work.

Toxicology

Interactions... Sodium pyrophosphate inhibits both the deposition of calcium salts and the formation of a calcifiable matrix in the aorta of rats treated with large doses of vitamin D.
Target OrgansEyes, skin, respiratory system
Exposure Routes · 2 items

The substance can be absorbed into the body by inhalation of dust and by ingestion.

inhalation, ingestion, skin and/or eye contact

Toxicity Summary · 3 items

The CIR Expert Panel concluded that the following 31 ingredients are safe in the present practices of use and concentration in cosmetics as described in this safety assessment, when formulated to be non-irritating...Tetrasodium Pyrophosphate...

Safe for use in cosmetics, with qualifications

IDENTIFICATION AND USE: This chemical is a colorless, transparent crystals or white powder or granules. It is odorless; slightly soluble in water; insoluble in alcohol and ammonia. This chemical is used as a cleaning compound; oil well drilling; water treatment, cheese emulsification; as a general sequestering agent, to remove rust stains; as am ingredient of one fluid ink eradicators, in electrodeposition of metals. It is used in textile dyeing; scouring of wool; buffer; food additive; detergent builder; water softener and dispersant. HUMAN EXPOSURE AND TOXICITY: Alkaline and irritating. Nausea, vomiting and diarrhea are probable after ingestion. Medical reports of acute exposures show mild to moderate dermal and ocular responses. ANIMAL STUDIES: Tetrasodium pyrophosphate when added to the diets of rats in high concentrations it caused kidney damage. This chemical caused teratogenic effects in chicken embryos. Acute studies show that direct contact causes severe irritation and corneal injury in the rabbit eye and that it may be irritating to skin. This chemical can be considered moderately toxic on ingestion, inducing metabolic acidosis, and hypocalcemia.

Signs and Symptoms · 5 items

Cough. Sore throat.

Redness.

Redness. Pain.

Nausea. Vomiting. Diarrhoea.

irritation eyes, skin, nose, throat; dermatitis

Human Toxicity Excerpts · 2 items

ALKALINE AND IRRITATING. NAUSEA, VOMITING AND DIARRHEA ARE PROBABLE AFTER INGESTION.

Medical reports of acute exposures ... show mild to moderate dermal and ocular responses.

Non-Human Toxicity Excerpts · 5 items

WHEN TSPP WAS ADDED TO THE DIET OF RATS FOR A PERIOD OF 6 MONTHS, MAXIMUM LEVEL TOLERATED EXCEEDED 1.8%, BUT WAS LESS THAN 3.0%. EXCESS PHOSPHATE CAUSED KIDNEY DAMAGE. /FROM TABLE/

WHEN TSPP WAS ADDED TO THE DIET OF RATS FOR A PERIOD OF 16 WK, MAXIMUM LEVEL TOLERATED WAS LESS THAN 1%. EXCESS PHOSPHATE CAUSED KIDNEY DAMAGE. /FROM TABLE/

SIGNIFICANT TOXICITY WAS PRODUCED IN DEVELOPING CHICKEN EMBRYOS UNDER ALL TEST CONDITIONS; YOLK TREATMENT (0.125-5 MG/EGG) @ 0 HR RESULTED IN ONLY 1 BIRD WITH SERIOUS ANOMALY (ECTOPIA CARDIS). TREATMENTS RESULTED IN MANY BIRDS WITH SEVERE & USUALLY MULTIPLE TERATA.

Acute studies show that direct contact causes severe irritation and corneal injury in the rabbit eye and that it may be irritating to skin.

For more Non-Human Toxicity Excerpts (Complete) data for TETRASODIUM PYROPHOSPHATE (6 total), please visit the HSDB record page.

RAIS Toxicity Values · 4 items

1

PPRTV Current

4

PPRTV Current

Hazard Quotient Level 0.1 or Cancer Risk Level 1E-06 · 6 items

7.80e+04

1.20e+06

2.00e+04

1.5E+01(G)

1.00e+00

Volatile

Hazard Quotient Level 3 or Cancer Risk Level 1E-04 · 6 items

2.30e+05

3.50e+06

6.00e+04

1.5E+01 (G)

1.00e+00

Volatile

Regulatory information

FDA Requirements · 2 items

Tetrasodium pyrophosphate used as a sequestrant in food for human consumption is generally recognized as safe when used in accordance with good manufacturing practice.

Tetrasodium pyrophosphate used as a sequestrant in animal drugs, feeds, and related products is generally recognized as safe when used in accordance with good manufacturing or feeding practice.

FIFRA Requirements · 2 items

As the federal pesticide law FIFRA directs, EPA is conducting a comprehensive review of older pesticides to consider their health and environmental effects and make decisions about their future use. Under this pesticide reregistration program, EPA examines health and safety data for pesticide active ingredients initially registered before November 1, 1984, and determines whether they are eligible for reregistration. In addition, all pesticides must meet the new safety standard of the Food Quality Protection Act of 1996. Pesticides for which EPA had not issued Registration Standards prior to the effective date of FIFRA, as amended in 1988, were divided into three lists based upon their potential for human exposure and other factors, with List B containing pesticides of greater concern and List D pesticides of less concern. Tetrasodium pyrophosphate is found on List D. Case No: 4053; Pesticide type: fungicide, herbicide, antimicrobial; Case Status: None of the active ingredients in the case are being supported for reregistration by their registrants. All are unsupported, or some are unsupported and some are cancelled. Cases described as "unsupported" generally are being processed for cancellation.; Active ingredient (AI): Tetrasodium pyrophosphate; AI Status: The active ingredient is no longer contained in any registered products ... "cancelled."

Residues of tetrasodium pyrophosphate are exempted from the requirement of a tolerance when used as a anticaking agent or conditioning agent in accordance with good agricultural practices as inert (or occasionally active) ingredients in pesticide formulations applied to growing crops or to raw agricultural commodities after harvest.

Safety data

Signal word
Warning
Symbol(GHS)
GHS07
Hazard statements
H302-H413-H332-H319-H315-H312
Precautionary statements
P264-P270-P301+P312-P330-P501-P261-P271-P304+P340-P312-P264-P280-P302+P352-P321-P332+P313-P362-P280-P302+P352-P312-P322-P363-P501-P264-P280-P305+P351+P338-P337+P313P
Consumer UsesSoftener and conditioner
Industry UsesCleaning agent
Methods of Manufacturing · 3 items

REACTION OF FURNACE-GRADE PHOSPHORIC ACID WITH SODIUM CARBONATE TO FORM DISODIUM PHOSPHATE WHICH IS IN TURN HEATED TO 450 DEGREES CENTIGRADE, FORMING TETRASODIUM PYROPHOSPHATE

PRODUCED BY MOLECULAR DEHYDRATION OF DIBASIC SODIUM PHOSPHATE @ 500 °C: BELL, INORG SYN 3, 98 (1950).

By fusing sodium phosphate, dibasic

Formulations/Preparations · 5 items

TSPP IS USED IN VANILLA INSTANT PUDDING-MIX AT LEVELS OF 2.8 G/113.4 G OF MIX 2.8 G/127.6 G OF CHOCOLATE MIX. PATENT 2,607,692. /FROM TABLE/

CURAFOS USED IN.../MICROBIOLOGICAL INHIBITORY/ EXPERIMENTS CONTAINED 15% TSPP, 70% STPP, AND 15% SHMP; FIBRISOL CONTAINED 25% SAPP, 15% TSPP, 10% SHMP, AND 50% NACL. /PHOSPHATES/

TSPP IS USED IN VANILLA INSTANT PUDDING-MIX AT LEVELS OF 1.5 G/92.3 G OF MIX & 1.5 G/113.8 G OF CHOCOLATE MIX. PATENT 2,801,924. TSPP IS USED IN UNFLAVORED INSTANT PUDDING-MIX AT 2.2 G/100.0 G OF MIX. PATENT 3,231,391. /FROM TABLE/

GRADES: PURE CRYSTALS; DRIED; FUSED; CP; FCC.

MANUFACTURERS: ...COMMERCIAL MIXTURES OF PHOSPHATES NORMALLY USED IN CURING MEAT PRODUCTS /ARE/ (CURAFOS AND FIBRISOL, MANUFACTURED BY JA BENCKISER)...

Household ProductsInformation on 167 consumer products that contain Tetrasodium pyrophosphate (TSPP) in the following categories is provided:
Use Classification · 6 items

EPA Safer Chemical Functional Use Classes -> Oxidants and Oxidant Stabilizers

Safer Chemical Classes -> Yellow triangle - The chemical has met Safer Choice Criteria for its functional ingredient-class, but has some hazard profile issues

Food additives

Food Additives -> ACIDITY_REGULATOR; EMULSIFIER; SEQUESTRANT -> JECFA Functional Classes

Food Additives -> ACIDITY_REGULATOR; EMULSIFIER; SEQUESTRANT -> JECFA Functional Classes

Food Additives -> ACIDITY_REGULATOR; EMULSIFIER; SEQUESTRANT -> JECFA Functional Classes

General Manufacturing Information · 6 items

Fabricated Metal Product Manufacturing

Diphosphoric acid, sodium salt (1:4): ACTIVE

.../COMPOUND IS/ NOW ALLOWED IN FROZEN DESSERTS AT LEVELS UP TO 0.2% /TO PREVENT CHURNING/.

...SEQUESTRANTS SUCH AS...PYROPHOSPHATE...WILL RETARD NITRIC OXIDE-HEMOGLOBIN FORMATION IN CURED MEATS BY CONTROLLING EFFECTS OF METAL IONS.

USED TO DECREASE AMT OF COOKED-OUT JUICES IN CURED HAMS AND PORK SHOULDER PICNICS, LOINS; CANNED HAMS &...CHOPPED HAM; BACON. /FROM TABLE/

USED TO PREVENT STAINING ON EXTERIOR OF VARIOUS CANNED GOODS DURING COOLING AND RETORT WATER TREATMENT. /FROM TABLE/

Additional notes · 1 item

DefinitionChEBI: Sodium diphosphate is an inorganic sodium salt comprised of a diphosphate(4-) anion and four sodium(1+) cations. More commonly known as tetrasodium pyrophosphate, it finds much use in the food industry as an emulsifier and in dental hygiene as a calcium-chelating salt. It has a role as a food emulsifier, a chelator and a food thickening agent. It contains a diphosphate(4-).