Environmental Science and Pollution Research

, Volume 23, Issue 17, pp 17503–17510 | Cite as

Influence of UV-B radiation on lead speciation in the presence of natural particles of estuarine waters

  • M. Praveen Kumar
  • A. M. Mota
  • M. L. S. Gonçalves
Research Article


The influence of UV-B irradiation on filtered and non-filtered water samples collected in a non-polluted area of Tagus estuary was evaluated in this study. In the laboratory, both samples were titrated with lead (Pb+2) followed by differential pulse anodic stripping voltammetry (DPASV), before and after 1 and 10 days under UV-B irradiation. Metal-ligand complexing parameters were obtained based on a macromolecular heterogeneous ligand described by two distinct sites with a labile behavior, and a third small homogeneous weaker group, which concentration was determined from a potentiometric titration. Under UV-B radiation, the complexing strength decreased with time in both (filtered and non-filtered) irradiated samples, but this effect was more pronounced in the non-filtered water, which might be due to some adsorption of dissolved macromolecular ligands on the particles and/or to further degradation of dissolved organic matter (DOM). Furthermore, the presence of particles favored the break-down of the macromolecular ligand under long UV-B exposure time. These results present ecological implications for the estuarine ecosystems such as bioavailability and toxicity.


Lead speciation UV-B radiation Tagus estuary Portugal Particles DPASV 



Praveen Kumar Mallupattu is highly thankful to Foundation of Science and Technology of Portugal for providing financial support in the form of Postdoctoral Fellowship (SFRH/BPD/37222/2007).


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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • M. Praveen Kumar
    • 1
  • A. M. Mota
    • 1
  • M. L. S. Gonçalves
    • 1
  1. 1.Centro de Química Estrutural, Instituto Superior Técnico, Universidade de LisboaLisboaPortugal

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