EDTA, DISODIUM

PRODUCT IDENTIFICATION

CAS NO. 139-33-3 (Anhydrous)
6381-92-6 (Dihydrate)

EDTA 

EINECS NO. 205-358-3
FORMULA C10H14N2Na2O82H2O
MOL WT. 372.25

H.S. CODE

 

TOXICITY

Oral rat LD50: 2000 mg/kg
SYNONYMS EDTA, Disodium Salt Dihydrate;
Ethylenediaminetetraacetic acid disodium salt dihydrate;
Ethanediylbis(N-(carboxymethyl)glycine) disodium salt; Disodium dihydrogen ethylenediaminetetraacetate; Versene disodium salt;
SMILES  

CLASSIFICATION

 

GENERAL DESCRIPTION OF CHELATING AGENT

Chelation is a chemical combination with a metal in complexes in which the metal is part of a ring. Organic ligand is called  chelator or chelating agent, the chelate is a metal complex. The larger number of ring closures to a metal atom is the more stable the compound. This phenomenon is called the chelate effect; it is generally attributed to an increase in the thermodynamic quantity called entropy that accompanies chelation. The stability of a chelate is also related to the number of atoms in the chelate ring. Monodentate ligands which have one coordinating atom like H2O or NH3 are easily broken apart by other chemical processes, whereas polydentate chelators, donating multiple binds to metal ion, provide more stable complexes. Chlorophyll, green plant pigment, is a chelate that consists of a central magnesium atom joined with four complex chelating agent (pyrrole ring). The molecular structure of the chlorophyll is similar to that of the heme bound to proteins to form hemoglobin, except that the latter contains iron(II) ion in the center of the porphyrin. Heme is an iron chelate. Chelation is applied in metal complex chemistry, organic and inorganic chemistry, biochemistry, and environment protection. It is used in chemotherapeutic treatments for metal poisoning. Chelating agents offers a wide range of sequestrants to control metal ions in aqueous systems. By forming stable water soluble complexes with multivalent metal ions,  chelating agents prevent undesired interaction by blocking normal reactivity of metal ions. EDTA, ethylenediaminetetraacetate (hexadentating), is a good example of common chelating agent which have nitrogen atoms and short chain carboxylic groups. The sodium salt of EDTA is used as an antidote for metal poisoning, an anticoagulant, and an ingredient in a variety of detergents.  Chelating agents are important in the field of soap, detergents, textile dyeing, water softening, metal finishing and plating, pulp and paper, enzyme deactivation, photo chemistry, and bacteriocides.

PHYSICAL AND CHEMICAL PROPERTIES

PHYSICAL STATE white crystalline powder

MELTING POINT

252 C (Decomposes)
BOILING POINT  
SPECIFIC GRAVITY

 

SOLUBILITY IN WATER

10 (g/100g)
pH 4 - 6 (5% Aq. Sol)
VAPOR DENSITY  

REFRACTIVE INDEX

 
NFPA RATINGS Health: 1; Flammability: 0; Reactivity: 0
FLASH POINT

 

STABILITY Stable under ordinary conditions

APPLICATIONS

Photography, Detergent, Chemical plating, Electroplating without cyanide, cleaning agent, plastic additives, printing of cotton and chemical fiber, industrial desulfation, inhibitor for plant growth, printing ink, medicine, paper and food industry. Water treatment chemical, Agriculture

SALES SPECIFICATION

APPEARANCE

white crystalline powder

CONTENT

99.0% min

LOSS ON DRYING

5.0% max

Cl

0.4% max

Fe

20ppm max
TRANSPORTATION
PACKING 25kgs in bag
HAZARD CLASS Not regulated
UN NO.

 

OTHER INFORMATION