Ethylenediaminetetraacetic acid disodium salt CAS NO.6381-92-6

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[rank] : AR

[structural formula] : HOOCH2C CH2COONa n-ch2-n HOOCH2C CH2COONa

[properties] : white or milky white crystalline or granular powder without odor or saltiness.Soluble in water, insoluble in ethanol, ether.

[purpose] : as heavy metal detoxifying agent, complexing agent, anti-oxygen synergist, stabilizer and softener.Calcium, magnesium and other metal reagents, metal masking agents.Disodium ethylenediamine tetraacetate [1] is an important complexing agent for complexing metal ions and separating metals.

Disodium ethylenediamine tetraacetic acid ACTS on calcium ions

Disodium ethylenediamine tetraacetic acid ACTS on calcium ions

[properties] : white crystalline powder, soluble in water, hardly soluble in ethanol and ether, its aqueous solution pH value is about 5.3.

Storage: sealed for preservation.

The preparation of

It can be made by the action of EDTA with sodium hydroxide and calcium carbonate.

Ethylenediamine tetraacetic acid called EDTA again, it is a kind of good in the chemical compound, it has six coordination atoms, forming complexes are called chelates, EDTA is often used in coordination titration, usually determine the content of metal ions.

features

The characteristics of

1. EDTA has extensive coordination properties and can form stable chelates with almost all metal ions.

Advantage: it provides the possibility of broad determination of elements (better than acid, alkali and precipitation methods).

Disadvantages: easy interference between multiple components - selectivity.

2. The ratio between EDTA and the formed m-edta is 1:1.

3. Most chelates are charged, so they dissolve in water and react quickly.

Toxicity protection: this product is low toxicity.Transoral LD50 was 2000mg/kg for rats.See "ethylenediamine tetraacetic acid" for other toxicity and protection.

Packing: in cartons or sacks lined with double plastic bags of 80kg each.

Physicochemical property: white crystalline powder.Low toxicity, soluble in water, 5% aqueous solution pH value 4 ~ 6.Acidic.It's hard to dissolve in alcohol.

Mainly used as complexing agent.

Dissociation equilibrium

In aqueous solution, two carboxyl H+ transfer to amino N to form bipolar ions:

EDTA is commonly expressed as H4Y, because it has little solubility in water and acid, it is commonly used as disodium salt: Na2H2Y·2H2O, or EDTA.

Ka1 = 10-0.9;Ka2 = 10-1.6;Ka3 = 10-2.1;Ka4 = 10-2.8;Ka5 = 10-6.2;Ka6 = 10-10.3.

Seven forms:

H6Y2+, H5Y+, H4Y, H3Y-, H2Y2-, HY3-, Y4-

When pH<1, it mainly exists in the form of H6Y2+.

When pH>11, it exists mainly in the form of Y4- - coordination ions.