Abstract
Complex formation of Pb(II) with polymethacrylic acid (PMA) and polyacrylic acid (PAA) is studied by sampled direct current, normal pulse, reverse pulse, and differential pulse polarography, by cyclic voltammetry and by differential pulse anodic stripping voltammetry. The two Pb(II) systems appear to be labile on the different time scales of several techniques, and at different ligand-to-metal ratios. Voltammetric titrations of Pb(II) with partially neutralized PMA or PAA allow the precise determination of the apparent formation constants K of the complexes present in both systems. Under conditions where adsorption of Pb(II) onto the cell walls is not negligible, i.e. at low concentrations and at pH > 4.5, the application of a previously described methodology also allows the precise determination of K by introducing a correction due to adsorption. In some cases anomalous behaviour is still observed, which cannot be explained by adsorption losses.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.