Determination of traces of EDTA, EGTA and DCTA by adsorptive accumulation of their complexes with hg(ii) followed by cathodic stripping.
The strong adsorption of the Hg(II) complexes of EDTA, DCTA and EGTA on a hanging mercury-drop electrode has been utilized in two procedures for cathodic-stripping determination of these complexing agents in water. The first procedure allows the determination of the free ligands or the total amount of 'available' metal. The second, which requires addition of excess of Hg(II) to the solution, gives the total amount of the ligand. The detection limit is 1 x 10(-8)M in the final solution at pH 4-6.
Ciszkowska
M
M
Department of Chemistry, Warsaw University, ul. Pasteura 1, 02-093 Warszawa, Poland.
Stojek
Z
Z