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Ethylenebis(nitrilodimethylene)tetraphosphonic acid Cas 1429-50-1

Production name: Ethylenebis(nitrilodimethylene)tetraphosphonic acid
Cas No.:1429-50-1
Molecular Formula:C6H20N2O12P4
Molecular Weight:436.12

AppearanceWhite crystal powder
Active acid (as EDTMPA)%96.0 min
Total phosphonic acid(as PO43-)%82.0 min
Chloride (Cl) %0.1 max
Moisture %2.0 max
Fe, mg/L5.0 max
pH(1% water solution)2.0 max


EDTMPA is white crystal powder at room temperature, with melting point 215-217℃, hard to be dissolved in water, the solubility is less that 5% at room temperature, easy dissolved in ammonia.EDTMPAhas strong metal ion chelating capacity, whose chelating constant with cuprum ion is larger than that of EDTA.

EDTMPA has high capacity for chelating metal ions. The complex constant with Cu is the largest in all chelating agents including EDTA.EDTMPAis a kind of high-pure grade reagent and innocuous, it can be used as detergent in semiconductor chip to prepare integrated circuit, as carrying agent for radioelement in medical industry, and as agent for inspection and therapy. The chelating capacity ofEDTMPAlargely exceed that of EDTA and DTPA, and can replace EDTA for chelating agent at almost any situation.


It should be sealed and shaded to be stored in a dry, cool, well ventilated place.