Among the salts of ethylenediaminetetraacetic acid (EDTA), the disodium salt is of the greatest importance. It serves as a key complexing agent.
It is utilized in solutions for electroless copper plating, gold plating, and lead-tin alloy plating, as well as for the electrochemical polishing of steel components and the pre-treatment of copper parts prior to silver plating; in these applications, EDTA-Na may also be used as a substitute.
Furthermore, it finds application in detergents, liquid soaps, shampoos, agricultural chemical sprays, bleaching and fixing solutions for the processing of color photographic materials, water purification agents, pH regulators, anticoagulants, and similar products.
In the redox initiation systems employed for the polymerization of styrene-butadiene rubber (SBR), EDTA disodium salt functions as a constituent of the activator; its primary role is to complex ferrous ions, thereby controlling the rate of the polymerization reaction.
| Test items |
Standard indicators |
Test results |
| Assay % |
99.0 Min |
99.2 |
| Chloride (Cl)% |
0.01 Max |
0.003 |
| Sulfate(SO4)Content% |
0.05 Max |
0.01 |
| Iron (Fe )% |
0.001 Max |
0.0001 |
| Lead(Pb)% |
0.001 Max |
Not Found |
PH
(50g/L,25ºC) solution |
4.0-5.0 |
4.36 |
| mgcaco3/g Chelating value |
265 Min |
266 |
| Appearance |
White crystalline powder |
White crystalline powder |
| Conclusions |
QUALIFIED |
QUALIFIED |