Interactions of diethylenetriaminepentaacetic acid (dtpa) and triethylenetetraaminehexaacetic acid (ttha) with major components of natural waters

De Stefano, Concetta; Gianguzza, Antonio; Piazzese, Daniela; Sammartano, Silvio
April 2003
Analytical & Bioanalytical Chemistry;Apr2003, Vol. 375 Issue 7, p956
Academic Journal
Abstract The binding ability of diethylene triamine penta-acetate (dtpa5 ) and triethylene tetraamine hexaacetate (ttha6 ) ligands towards major components, 11+, Na+, Mg2+ and Ca2+, of natural waters was studied in both single and mixed ionic media at different ionic strengths and at `I'=25 °C. Some measurements, performed in Mg2+-Ca2+ mixtures, allowed us to find the formation of new mixed species MgCa(dtpa), MgCa(ttha) and MgCaH(ttha), here reported for the first time. All the complexes formed in the various systems were characterized in terms of both stoichiometry and stability, and an attempt was made to find general rules for the stability of mixed metal com- plexes in comparison with that of simple species. To obtain quantitative information on the complexing ability of dtpa and ttha in seawater, measurements have been car- ried out in artificial seawater ionic medium (Na+, K+, Ca2+, Mg2+, Cl and SO42 ). Calculations, performed by considering the salt mixture as single salt BA, allowed us to find some quite stable BiHjL species. Under the natural seawater conditions [S(salinity)=35], we found for the most important species logβ B(dtpa)=9.64 and log βB2(dtpa)= 10.2. Literature data comparison is also reported.


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