EDTA Na4 - Ethylene diamine tetraacetic acid Tetra Sodium Salt (Trilon B Powder)


SKU: RD11244

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EDTA Tetrasodium salt >85%


Technical grade

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 and for dissolving scale. EDTA Na4 is much more stable than many other organic stabilising agents like citric acid, tartaric acid and gluconates especially at elevated temperatures. It is stable at 200°C even under pressure.

EDTA tetrasodium salt is predominatly used in agriculture, water treatment, pulp and paper industries and also used in the manufacture of cleaners and detergents.

Chelating agents bind, sequester or capture trace amounts of iron, copper, manganese, calcium and other metals that occur naturally in many materials. Such naturally occurring metals can cause 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, bacteridal cleaners, vehicle washes etc.

EDTA is used in soaps ,many hair products, creams and lotions.

In the textile industry, EDTA tetrasodium is emploted tp prevent metal ion impurities from changing colours of dyed products. For chlorine-free bleaching it inhibits the ability of metal ions, especially Mn2+, from catalysing the Hydrogen Peroxide.

In Photography, tetrasodium EDTA is used as bleach in photographic film processing.

Other key applications for EDTA tetrasodium include: In Photography as a bleach in photographic film processing. It controls the oxidation conditions of metal ions (Photography, sulphur removal from waste gases). 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. In Water treatment - to control water hardness and scale-forming calcium and magnesium ions and to prevent scale formation.


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

H318 Causes serious eye damage.
H332 Harmful if inhaled.
H302 Harmful if swallowed.
H373 May cause damage to organs (Respiratory system) through prolonged
or repeated exposure (inhalation).

P271 Use only outdoors or in a well-ventilated area.
P280 Wear eye/face protection.
P261 Avoid breathing dust.
P260 Do not breathe dust/gas/mist/vapours.
P270 Do not eat, drink or smoke when using this product.
P264 Wash with plenty of water and soap thoroughly after handling.


PLEASE NOTE: This product is not for human or animal consumption. 


Chemistry of EDTA Na4

In aqueous solutions, EDTA competes for metal ions with other anions such as hydroxide, sulphate, sulphide, carbonate and oxalate that form sparingly soluble metal salts. The formation of chelates reduces the concentration of free metal ions to such an extent that the solubility products of many sparingly soluble metal salts are no longer exceeded. The result is that the salts no longer precipitate or may even redissolve.


Properties of EDTA Tetrasodium:

  • 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: 240 oC
  • Solubility: soluble in water 100-110g/100ml @20C
  • pH: 11 - 12 (10% solution)

EDTA Na4 melts at 240°C and above this it starts to lose water of crystalisation and at 300°C it decomposes. It is stable in both strong acids and bases. It is broken down by srong oxidising agents like chromic acid and potassium permanganate.

Tetrasodium EDTA stabilises polyvalent metal ions allowing an increase in the rate at which metals dissolve. When used in mildly alkaline cleaning solutions, metals are less likely to suffer from corroson as compared to cleaning the metals with acids (with exception to aluminium).

It can be used to stabilise phosphonates in alkaline and neutral derrusting and descaling baths. It also prevents lime soaps from precipitating which prolongs the working life of baths.