Basic information
- Name:
Disodium pyrophosphate
- CAS No.:
7758-16-9
- Molecular Structure:
- Formula:
- H2Na2O7P2
- Molecular Weight:
- 221.94
- Deleted CAS:
- 10101-84-5
- Synonyms:
- Disodium dihydrogen pyrophosphate;Disodiumdiphosphate;Disodium pyrophosphate (Na2H2P2O7);SAPP;SAPP 40;SAPP-RD 1;Sodium hydrogen phosphate (Na2H2P2O7);Sodium acid pyrophosphate(SAPP);Sodium Acid Pyrophosphate (SAPP);Diphosphoricacid, disodium salt (9CI);Pyrophosphoric acid, disodium salt (8CI);Sodiumpyrophosphate (Na2H2P2O7) (6CI);Dihydrogen disodium pyrophosphate;Disodium dihydrogen diphosphate;Disodium dihydrogendiphosphate (Na2H2P2O7);
- EINECS:
- 231-835-0
- Solubility:
- H2 O: 0.1 M at 20 °C, clear, colorless
- Appearance:
- white powder
- Safety Description:
- 24/25 Details
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Chemistry
Molecular Structure:
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Molecular Formula: H2Na2O7P2
Molecular Weight: 221.9387
IUPAC Name: Disodium [hydroxy(oxido)phosphoryl] hydrogen phosphate
Synonyms of Disodium pyrophosphate (CAS NO.7758-16-9): Dinatriumpyrophosphat ; Dinatriumpyrophosphat [German] ; Diphosphoric acid, disodium salt ; Disodium acid pyrophosphate ; Disodium dihydrogen diphosphate ; Disodium dihydrogen pyrophosphate ; Disodium diphosphate ; EINECS 231-835-0 ; HSDB 377 ; Pyrophosphoric acid, disodium salt ; Sodium pyrophosphate (Na2H2P2O7) ; UNII-H5WVD9LZUD ; Diphosphoric acid, sodium salt (1:2) ; Disodium dihydrogenpyrophosphate ; Sodium acid pyrophosphate
CAS NO: 7758-16-9
Product Categories: Inorganics
Melting point: −70°C
H bond acceptors: 7
H bond donors: 4
Freely Rotating Bonds: 2
Polar Surface Area: 121.91 Å2
Uses
Disodium pyrophosphate (CAS NO.7758-16-9) is a buffering and chelating agent, with many food and industrial uses.
Food uses:
Used in canned seafood to maintain color and reduce purge during retorting. In cured meats, it speeds the conversion of sodium nitrite to NO2- by forming the HONO intermediate, and can improve water holding capacity.
It also used to keep the color of the potatoes from darkening.so it is found in frozen hash browns and other potato products.
Industrial uses:
In leather treatment, it can be used to remove iron stains on hides during processing.
It also can be used with sulfamic acid in some dairy applications for cleaning, especially to remove soapstone.
In petroleum production, it can be used as a dispersant in oil well drilling muds.
Toxicity Data With Reference
| Organism | Test Type | Route | Reported Dose (Normalized Dose) | Effect | Source |
|---|---|---|---|---|---|
| mouse | LD50 | intraperitoneal | 1gm/kg (1000mg/kg) | Arzneimittel-Forschung. Drug Research. Vol. 7, Pg. 24, 1957. | |
| mouse | LD50 | intravenous | 59mg/kg (59mg/kg) | Arzneimittel-Forschung. Drug Research. Vol. 7, Pg. 445, 1957. | |
| mouse | LD50 | oral | 2650mg/kg (2650mg/kg) | Arzneimittel-Forschung. Drug Research. Vol. 7, Pg. 445, 1957. | |
| mouse | LD50 | subcutaneous | 480mg/kg (480mg/kg) | Arzneimittel-Forschung. Drug Research. Vol. 7, Pg. 445, 1957. | |
| rabbit | LD | skin | > 300mg/kg (300mg/kg) | Acute Toxicity Data. Journal of the American College of Toxicology, Part B. Vol. 1, Pg. 47, 1990. |
Consensus Reports
Reported in EPA TSCA Inventory.
Safety Profile
Safety Statements of Disodium pyrophosphate (CAS NO.7758-16-9): 24/25
S24/25: Avoid contact with skin and eyes.
WGK Germany: 2
RTECS: UX6475000
Poison by intravenous route. Moderately toxic by ingestion and subcutaneous routes. An irritant to skin, eyes, and mucous membranes. When heated to decomposition it emits toxic fumes of POx and Na2O.
Specification
Other names of Disodium pyrophosphate (CAS NO.7758-16-9):
Diphosphoric acid, disodium salt;Disodium diphosphate;Disodium dihydrogen ;pyrophosphate;Sodium acid pyrophosphate