Etidronic acid
Synonyms
Phosphonic acid, (1-hydroxyethylidene)di-;
Phosphonic acid, P,P'-(1-hydroxyethylidene)bis-;
HEDP;
Category
Anionic Surfactant
> Phosphonate
>> Hydroxyalkyl Phosphonate
>>> Hydroxy Linearalkyl Phosphonate
Chemical Numbering System
CAS: 2809-21-4
EINECS: 220-552-8
Molecular Formula & Molecular Weight
Molecular Formula: C2H8O7P2
Molecular Weight: 206.03
Structure
Properties
Appearance (1), liquid; (2), solid.
Solubility soluble in water.
Stability stable.
Risk Liquid form: irritation, irritation to skin, eye.
GHS label: 
Animal Toxicity
Table 1 Animal toxicity values
|
mouse oral LD50 |
1800mg/kg[1] |
Reproductive effect[1].
Ecology may be hazardous to environment. Water body should be given special attention.
Biodegradability biodegradable.
Characteristics excellent chelating, anticorrosive, dispersing, cleansing abilities.
Synthesis
Quality Standards & Test Methods
1, Physical and chemical indexes
|
Item |
Physical and chemical indexes |
|
Liquid/Solid |
|
|
Actives, %, ≥ |
50.0/90.0 |
Test Methods
(1), Actives
GB/T 13173 Surface active agents -- Detergents -- Testing methods
2, Hazardous substances indexes
|
Item |
Hazardous substances indexes |
|
Liquid/Solid |
|
|
Heavy metals (as Pb), mg/kg, ≤ |
20 |
|
As, mg/kg, ≤ |
3 |
Test Methods
(1), Heavy metals (as Pb)
Safety and Technical Standards for Cosmetics (2015 Edition)
GB/T 30799 The test method of food detergents -- Determination of heavy metals
(2), As
Safety and Technical Standards for Cosmetics (2015 Edition)
GB/T 30797 The test method of food detergents -- Determination of total arsenic
3, Product standards
(1), Chinese standards
(1a), GB/T 26324 1-Hydroxyethylidene-1,1-diphosphonate acid
(1b), HG/T 3537 Water treatment chemicals -- 1-Hydroxyethylidene-1,1-diphosphonate acid (solid)
4, Further explanation
(a), On physical and chemical indexes: firstly, shall be indicated carbon atom distribution; secondly, shall be indicated average molecular weight.
(b), Used in cosmetics, should be test for harmful substances or furtherly test for microorganisms, according to local regulations and standards.
Major Uses
1, Typical applications
Use as chelating agent.
Use as anticorrosive agent.
2, Personal care products
Chelating agent in personal care products.
Further information:
(1), In accordance with EU regulations (EC) No 1223/2009, directive 89/174/EEC, etidronic acid and its salts are included in Annex III/53.
Can be applied:
(a), hair product: maximum concentration is 1.5% in leave-on products (as etidronic acid).
(b), soap: maximum concentration is 0.2% in leave-on products (as etidronic acid).
(2), In accordance with Safety and Technical Standards for Cosmetics (2015 Edition) of China, etidronic acid and its salts are the restricted components.
Can be applied:
(a), hair product: maximum concentration is 1.5% in leave-on products (as etidronic acid).
(b), soap: maximum concentration is 0.2% in leave-on products (as etidronic acid).
3, Water treatment
Chelating agent, scale inhibitor, corrosion inhibitor in water treatment.
Manufacturers
References
[1]: ChemIDplus. 2809-21-4, Etidronic acid
Update: 20140330(1); 20190311(2);