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

Abstract

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.

Keywords

Lead speciation UV-B radiation Tagus estuary Portugal Particles DPASV 

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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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