Edta Heavy Metals

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EDTA-ACID

EDTA Acid, also known as Ethylene Diamine Tetraacetic Acid, is an important organic compound with the form C₁₀H₁₆N₂O₈. It is a colorless, odorless solid that dissolves in water and is commonly used in chemical analysis and industrial applications.

Chemical property:
Molecular formula: C₁₀H₁₆N₂O₈
Molar mass: 292.24 g/mol
Structure: it's molecule contains two amino groups (-NH₂) and four carboxylic groups (-COOH), which can form stable coordination compounds with a variety of metal ions.

preparation: it is usually prepared by the reaction of cyanoacetic acid with ethylenediamine. The specific steps are as follows:

Ethylenediamine reacts with cyanoacetate under basic conditions to form N,N' -bis (carboxymethyl) ethylenediamine.
The intermediate then underwent a further reaction to produce it.

It is a polyvalent chelator capable of forming a stable chelate with many divalent and trivalent metal ions (e.g. Ca² +, Mg² +, Fe³ +, etc.) and is often used in the separation and analysis of softened water and metal ions.

In the field of water treatment, EDTA is mainly used for water softening and removal of heavy metal ions. By chelating, EDTA can effectively capture and remove hardness ions such as calcium and magnesium from water, preventing these ions from forming scale in water pipes and boilers. This function is critical for both industrial and domestic water supply systems, as scaling not only reduces the efficiency of equipment, but can also lead to damage to equipment. In addition, EDTA can effectively remove heavy metal ions such as lead, cadmium and mercury from water, ensuring the safety of water quality.

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