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| Format: | Artículo científico |
| Language: | en |
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Universidad Autónoma de Baja California
2003
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| Online Access: | https://www.redalyc.org/articulo.oa?id=48029401 |
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Table of Contents:
- Chemical speciation of dissolved lead in polluted environments. A case of study: the Pontevedra Ria (NW Spain) A. Cobelo R. Prego O. Nieto Ciencias de la Tierra Lead rias Galicia pollution speciation Chemical speciation of dissolved lead was determined at four sampling sites in the Pontevedra Ría (NW Spain) by differentialpulse anodic stripping voltammetry (DPASV) with a HMDE. Sampling location was chosen due to its evident anthropogenicinfluence: one sample was taken in the Lérez River mouth (2.2-salinity) and other three samples were taken in the surroundingsof the village of Marín (salinity 3032). Lead concentrations were 0.64 nM (river sample) and 4.821.9 nM (saline samples).Speciation results showed that organic chelates of lead, 8895% of total dissolved lead, are the dominant species of the metaleven at these high concentrations. Two types of lead organic complexing ligands were detected in all samples. The riverwater sample showed the presence of a strong ligand with a concentration of ~7 nM with a conditional stabilityconstant of K´Pb-L1 ≥ 1011.1, and a weaker ligand (K´Pb-L2 = 108.2) with a concentration of 53.4 nM. The three saline samples showedsimilar behavior: a strong ligand (K´Pb-L1 ~ 108.6) with concentration ranging from 33.0 to 53.5 nM, and a weaker complexingligand (K´Pb-L2 ~ 107.5) with concentration ranging from 32.6 to 50.5 nM. All lead-organic ligand complexes (except the strongcomplex in the river water sample) showed labile behavior in the time scale of the technique. 2003 artículo científico 0185-3880 https://www.redalyc.org/articulo.oa?id=48029401 en http://www.redalyc.org/revista.oa?id=480 Ciencias Marinas application/pdf Universidad Autónoma de Baja California Ciencias Marinas (México) Num.4 Vol.29