What is EDTA Tetrasodium:
Tetrasodium EDTA is a white solid, very soluble in water and forming a basic solution. Prepared from ethylenediamine, formaldehyde, and sodium cyanide in basic solution, or from ethylenediamine and sodium chloroacetate, EDTA is a strong complexing and chelating agent. It reacts with many metallic ions to form soluble chelates. As such, it is widely used in analysis to retain alkaline earths and heavy metals in solution. It is used as an antidote for metal poisoning, an anticoagulant, and an ingredient in a variety of industrial reagents.
- Synonyms: (ethylenedinitrilo)tetraacetic acid tetrasodium salt dihydrate; tetrasodium ethylene diamine tetraacetate; tetrasodium 2,2′,2”,2”’-(ethane-1,2-diyldinitrilo)tetraacetate; ethylenediaminetetraacetate de tetrasodium
- CAS No. 64–02–8
- EINECS No: 200–573–9
- Appearance: white crystalline solid
- Formula: C10H16N2O8.4Na
- Relative Density: 0.7 g/cm3
- Molar Mass: 380.170 g mol/1
- Melting point: >200 oC decomposes
- Solubility: soluble in water 100–110g/100ml @20C
- pH: 11 – 12 (10% solution)
Uses for Tetra sodium EDTA
EDTA tetrasodium salt is predominatly used in agriculture, water treatment, food processing, pulp and paper industries and also used in the manufacture of cleaners and detergents.
Chelating agents bind or capture trace amounts of iron, copper, manganese, calcium and other metals that occur naturally in many materials. Such naturally occurring metals can cause foods to degrade, chemical degradation, discoloration, scaling, instability, rancidity, ineffective cleaning performance and other problems.
In Metalworking indutries it is used for surface preparation, metal cleaning, metal plating, and in metalworking fluids.
In Cleaning products EDTA is employed to remove hard water scale, soap film, and inorganic scales. It is commonly used in a wide variety of cleaning products and formulations, including hard surface cleaners, laundry detergents, bactericidal cleaners, vehicle washes etc.
In personal care products like soaps, creams, shampoos it is used to increase effectiveness and improve stability of the products.
Other key applications for EDTA tetrasodium include: In Photography as a bleach in photographic film processing. In the manufacturing of paper to maximize bleaching efficiency during pulping, prevent brightness reversion, and protect bleach potency. In Scale removal and prevention – to clean calcium and other types of scale from boilers, evaporators, heat exchangers, filter cloths, and glass-lined kettles. I Water treatment – to control water hardness and scale-forming calcium and magnesium ions and to prevent scale formation.
USING EDTA TO REJUVENATE LEAD-ACID BATTERIES:
EDTA tetra sodium salt can be used to dissolve and remove sulphate deposits from lead acid batteries. This is not a permanent fix for old batteries but it will extend their life. For an average sized battery add 5g (1 teaspoon) of EDTA per cell. Dissolve the EDTA in deionised water before adding. Note: Do not try to dissolve EDTA in battery acid. Remove a small amount of acid in cell and add EDTA solution. Allow to sit for a few days, agitating the solution regularly and then fully charge battery.
Health & Safety
Risk Phrases: R38– Irritating to skin. R41– Risk of serious damage to eyes. R43– May cause sensitization by skin contact.
Safety Phrases: S2– Keep out of the reach of children. S24– Avoid contact with skin. S26– In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S37/39– Wear suitable gloves and eye/face protection. S46– If swallowed, seek medical advice immediately and show this container or label.