Abstract
BY the addition of disodium nitrilotriacetate (HX) to a metal versenate (MeY), a mixed complex is formed and the pH of the solution is lowered due to the following reaction: 
The titration with sodium hydroxide of a solution containing equivalent amounts of metal versenate and disodium nitrilotriacetate results in a sharp end-point when an equivalent amount of base (sodium, hydroxide) is added.
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References
Martell, A., and Chaberek, S., J. Amer. Chem. Soc., 74, 5052 (1952).
Schwarzenbach, G., et al., Helv. Chim. Acta, 28, 828 (1945).
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ISRAÉLI, Y. Formation Constants of Some Mixed Complexes resulting from the Reaction of Disodium Nitrilotriacetate with Metal Versenates (EDTA). Nature 201, 389–390 (1964). https://doi.org/10.1038/201389a0
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DOI: https://doi.org/10.1038/201389a0
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