Basic information
- Name:
Etidronic acid
- CAS No.:
2809-21-4
- Molecular Structure:
- Formula:
- C2H8O7P2
- Molecular Weight:
- 206.02
- Deleted CAS:
- 100511-44-2|103736-66-9|106908-76-3|129130-42-3|138360-84-6|192526-55-9|303177-33-5|51888-66-5|66216-98-6|853028-38-3|85985-26-8|86159-18-4
- Synonyms:
- (1-Hydroxyethylidene)bisphosphonic acid;(1-Hydroxyethylidene)diphoshonic acid;(Hydroxyethylidene)diphosphonic acid;1,1,1-Ethanetriol diphosphonate;1-Hydroxyethane-1,1-bisphosphonic acid;1-Hydroxyethane-1,1-diphosphonate;1-Hydroxyethanediphosphonic acid;1-Hydroxyethylidene-1,1-bisphosphonate;1000SL;Acetodiphosphonic acid;Acide etidronique [INN-French];Acidum etidronicum [INN-Latin];BRN 1789291;Dequest 2010;Dequest Z 010;EHDP;Ethane-1-hydroxy-1,1-diphosphonic acid;Etidronate;Ferrofos 510;HEDP;Hydroxyethane-1,1-diphosphonic acid;Oxyethylidenediphosphonic acid;Phosphonic acid, (1-hydroxyethylidene)di-;RP 61;Turpinal SL;UNII-M2F465ROXU;Phosphonic acid, P,P'-(1-hydroxyethylidene)bis-;
- EINECS:
- 220-552-8
- Density:
- 2.114 g/cm3
- Melting Point:
- 198~199 °C
- Boiling Point:
- 578.8 °C at 760 mmHg
- Flash Point:
- 303.8 °C
- Appearance:
- light beige powder
- Hazard Symbols:
Xi- Risk Codes:
- 37/38-41
- Safety Description:
- 26-39 Details
- Transport Information:
- UN 3265
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Chemistry
Molecular structure of Etidronic acid (CAS NO.2809-21-4) is:
Product Name: Etidronic acid
CAS Registry Number: 2809-21-4
IUPAC Name: (1-hydroxy-1-phosphonoethyl)phosphonic acid
Molecular Weight: 206.028242 [g/mol]
Molecular Formula: C2H8O7P2
XLogP3-AA: -3.7
H-Bond Donor: 5
H-Bond Acceptor: 7
EINECS: 220-552-8
Melting Point: 198~199 °C
Stability: Stable. Incompatible with strong oxidizing agents.
Surface Tension: 139.2 dyne/cm
Density: 2.114 g/cm3
Flash Point: 303.8 °C
Enthalpy of Vaporization: 99.45 kJ/mol
Boiling Point: 578.8 °C at 760 mmHg
Vapour Pressure: 8.34E-16 mmHg at 25°C
Product Categories: Industrial/Fine Chemicals;Inorganic & Organic Chemicals;Analytical Chemistry;Ligands for Pharmaceutical Research;Radiopharmaceutical Chemistry (Chelating Reagents);Phosphonate antiscalant
Uses
Etidronic acid (CAS NO.2809-21-4) is a bisphosphonate used in detergents, water treatment, cosmetics and pharmaceutical treatment. It is a chelating agent and may be added to bind or, to some extent, counter the effects of substances, such as calcium, iron or other metal ions, which may be discharged as a component of grey wastewater and could conceivably contaminate groundwater supplies. As a phosphonate it has corrosion inhibiting properties on unnalloyed steel. It also acts to retard rancidification and oxidation of fatty acids.
Toxicity Data With Reference
| Organism | Test Type | Route | Reported Dose (Normalized Dose) | Effect | Source |
|---|---|---|---|---|---|
| mouse | LD50 | oral | 1800mg/kg (1800mg/kg) | Angewandte Chemie, International Edition in English. Vol. 14, Pg. 94, 1975. |
Consensus Reports
Reported in EPA TSCA Inventory.
Safety Profile
Moderately toxic by ingestion. When heated above 200° it decomposes violently to produce toxic fumes of phosphine, phosphoric acid, and POx.
Hazard Codes: 
Xi
Risk Statements: 37/38-41
R37/38:Irritating to respiratory system and skin.
R41:Risk of serious damage to the eyes.
Safety Statements: 26-39
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.
S39:Wear eye / face protection.
RIDADR: UN 3265
WGK Germany: 2
RTECS: SZ8562100
F: 10
HazardClass: 8
PackingGroup: II
Specification
Etidronic acid , its cas register number is 2809-21-4. It also can be called (1-Hydroxyethylidene)bisphosphonic acid ; 1-Hydroxy-1,1-diphosphonoethane ; Etidronic acid [USAN:INN:BAN] ; Phosphonic acid, (1-hydroxyethylidene)bis- ; (1-Hydroxyethylene)diphosphonic acid ; (1-Hydroxyethylidene)bis(phosphonic acid) .It is a light beige powder.