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1-Hydroxyethane-1,1-diphosphonic Acid

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1-Hydroxyethane-1,1-diphosphonic Acid

EINECS 220-552-8
CAS No. 2809-21-4 Density 2.114 g/cm3
Solubility Melting Point 198~199 °C
Formula C2H8O7P2 Boiling Point 578.8 °C at 760 mmHg
Molecular Weight 206.02 Flash Point 303.8 °C
Transport Information UN 3265 Appearance light beige powder
Safety 26-39 Risk Codes 37/38-41
Molecular Structure Molecular Structure of 2809-21-4 (1-Hydroxyethane-1,1-diphosphonic Acid) Hazard Symbols IrritantXi

(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;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-;1-Hydroxy Ethylidene-1,1-Diphosphonic Acid (HEDP);HT-101 HEDP;


1-Hydroxyethane-1,1-diphosphonic Acid Chemical Properties

Molecular structure of 1-Hydroxyethane-1,1-diphosphonic Acid (CAS NO.2809-21-4) is:

Product Name: 1-Hydroxyethane-1,1-diphosphonic 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

1-Hydroxyethane-1,1-diphosphonic Acid Uses

 1-Hydroxyethane-1,1-diphosphonic 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.

1-Hydroxyethane-1,1-diphosphonic Acid 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.

1-Hydroxyethane-1,1-diphosphonic Acid Consensus Reports

Reported in EPA TSCA Inventory.

1-Hydroxyethane-1,1-diphosphonic Acid 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: IrritantXi
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.
WGK Germany: 2
RTECS: SZ8562100
F: 10
HazardClass: 8
PackingGroup: II

1-Hydroxyethane-1,1-diphosphonic Acid Specification

 1-Hydroxyethane-1,1-diphosphonic Acid , its cas register number is 2809-21-4. It also can be called (1-Hydroxyethylidene)bisphosphonic acid ; 1-Hydroxy-1,1-diphosphonoethane ; 1-Hydroxyethane-1,1-diphosphonic Acid [USAN:INN:BAN] ; Phosphonic acid, (1-hydroxyethylidene)bis- ; (1-Hydroxyethylene)diphosphonic acid ; (1-Hydroxyethylidene)bis(phosphonic acid) .It is a light beige powder.

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