Characteristic
1. EDTA has extensive coordination properties and almost can form stable chelates with all metal ions.
Advantage: provides the possibility of extensive determination of elements (superior to acid and precipitation).
Disadvantages: interference between various components is selective.
The ratio of 2. EDTA to M- EDTA is 1:1.
3. most of the chelates are charged, so they can be dissolved in water and react rapidly CASNo:6381-92-6.
Toxic protection: This product is low toxic. The oral LD50 of rats was 2000mg/kg. Other toxic and protective contents refer to ethylene diamine tetra acetic acid.
Packaging: packed in cartons or gunny bags lined with double plastic bags, 80kg per bag.
Physicochemical properties: white crystalline powder. Low toxicity, soluble in water, 5% of the aqueous solution pH value of 4~6. Acidity. It is hard to dissolve in alcohol.
It is mainly used as complexing agent.
Dissociation balance
In aqueous solution, 2 carboxyl groups H+ are transferred to amino N to form bipolar ions.
EDTA is often expressed as H4Y, because its solubility in water and acid is very small, commonly used for its disodium salt: Na2H2Y. 2H2O, also abbreviated as EDTA.
When the acidity of the solution is high, the two carboxyl groups can accept H +, forming H 6Y 2 +, which is equivalent to a hexabasic acid and has a six-order dissociation constant.
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 mainly exists in the form of Y4- - coordination ion.
Test Item | Standard | Test Resul |
Apprearance | White Crystalline Powder | White Crystalline Powder |
PH 5% P-P 25℃ | 4.0-5.0 | 4.3 |
Purity,% | ≥99.0 | 99.5 |
Clarity Test | PASS | PASS |
Chelate Value(mg/g) | ≥260 | 265 |
Heavy Metals (as Pb),% | ≤0.001 | 0.001 |
Fe,% | ≤0.001 | 0.001 |
Chlorides,% | ≤0.05 | 0.01 |
SO4,% | ≤0.001 | 0.0007 |
NTA,% | - | - |
Test Conclusion:PASS.
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