Chemical speciation of dissolved lead in polluted environments. A case of study: the Pontevedra Ria (NW Spain)

Chemical speciation of dissolved lead in polluted environments. A case of study: the Pontevedra Ria (NW Spain)

 Chemical speciation of dissolved lead was determined at four sampling sites in the Pontevedra Ría (NW Spain) by differential pulse anodic stripping voltammetry (DPASV) with a HMDE. Sampling location was chosen due to its evident anthropogenic influence: one sample was taken in the Lérez Ri...

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Autores principales: Cobelo-García, A, Prego, R, Nieto, O
Formato: Online
Lenguaje:eng
Publicado: Iniversidad Autónoma de Baja California 2003
Acceso en línea:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/178
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spelling oai:cienciasmarinas.com.mx:article-1782019-04-23T23:34:30Z Chemical speciation of dissolved lead in polluted environments. A case of study: the Pontevedra Ria (NW Spain) Especiación química del plomo disuelto en ambientes contaminados. Caso de estudio: la Ría de Pontevedra (NO España) Cobelo-García, A Prego, R Nieto, O Lead speciation pollution rias Galicia Plomo especiación contaminación rías Galicia  Chemical speciation of dissolved lead was determined at four sampling sites in the Pontevedra Ría (NW Spain) by differential pulse anodic stripping voltammetry (DPASV) with a HMDE. Sampling location was chosen due to its evident anthropogenic influence: one sample was taken in the Lérez River mouth (2.2-salinity) and other three samples were taken in the surroundings of the village of Marín (salinity 30–32). Lead concentrations were 0.64 nM (river sample) and 4.8–21.9 nM (saline samples). Speciation results showed that organic chelates of lead, 88–95% of total dissolved lead, are the dominant species of the metal even at these high concentrations. Two types of lead organic complexing ligands were detected in all samples. The river water sample showed the presence of a strong ligand with a concentration of ~7 nM with a conditional stability constant 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 showed similar behavior: a strong ligand (K'Pb-L1 ~ 108.6) with concentration ranging from 33.0 to 53.5 nM, and a weaker complexing ligand (K'Pb-L2 ~ 107.5) with concentration ranging from 32.6 to 50.5 nM. All lead-organic ligand complexes (except the strong complex in the river water sample) showed labile behavior in the time scale of the technique. La especiación química del plomo disuelto se llevó a cabo en cuatro estaciones de muestreo en la Ría Pontevedra (NO de España) utilizando la técnica de voltametría de redisolución anódica de pulso diferencial (DPASV) con un HMDE. La zona de muestreo fue elegida en base a su clara influencia antropogénica: se tomó una muestra en la desembocadura del Río Lérez (salinidad 2.2) y las otras tres se tomaron en las proximidades de la Villa de Marín (salinidad 30–32). Las concentraciones de plomo obtenidas fueron de 0.64 nM (muestra de agua dulce) y 4.8–2.9 nM (muestras salinas). Los resultados de la especiación mostraron que los quelatos orgánicos del plomo, 88–95% del plomo disuelto total, son las especies dominantes del metal incluso a estas elevadas concentraciones. En todas las muestras se detectó la presencia de dos clases de ligandos complejantes del plomo. En la muestra de río se obtuvo un ligando complejante fuerte, de concentración ~7 nM, con una constante condicional K'Pb-L1 ≥ 1011.1, y un ligando más débil (K'Pb-L2 = 108.2) de concentración 53.4 nM. En las tres muestras de aguas salinas se obtuvieron resultados muy similares: un tipo de ligando fuerte (K'Pb-L1 ~ 108.6) con una concentracion comprendida entre 33.0 y 53.5 nM, y un tipo de ligando complejante del plomo más débil (K'Pb-L2 ~ 107.5) con concentraciones comprendidas entre 32.6 y 50.5 nM. Todos los complejos plomo-ligando orgánico (excepto el complejo fuerte de la muestra de río) mostraron un comportamiento lábil en la escala de tiempo de la técnica. Iniversidad Autónoma de Baja California 2003-03-06 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado application/pdf https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/178 10.7773/cm.v29i4.178 Ciencias Marinas; Vol. 29 No. 4 (2003); 377-388 Ciencias Marinas; Vol. 29 Núm. 4 (2003); 377-388 2395-9053 0185-3880 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/178/153
institution Ciencias Marinas
collection OJS
language eng
format Online
author Cobelo-García, A
Prego, R
Nieto, O
spellingShingle Cobelo-García, A
Prego, R
Nieto, O
Chemical speciation of dissolved lead in polluted environments. A case of study: the Pontevedra Ria (NW Spain)
author_facet Cobelo-García, A
Prego, R
Nieto, O
author_sort Cobelo-García, A
title Chemical speciation of dissolved lead in polluted environments. A case of study: the Pontevedra Ria (NW Spain)
title_short Chemical speciation of dissolved lead in polluted environments. A case of study: the Pontevedra Ria (NW Spain)
title_full Chemical speciation of dissolved lead in polluted environments. A case of study: the Pontevedra Ria (NW Spain)
title_fullStr Chemical speciation of dissolved lead in polluted environments. A case of study: the Pontevedra Ria (NW Spain)
title_full_unstemmed Chemical speciation of dissolved lead in polluted environments. A case of study: the Pontevedra Ria (NW Spain)
title_sort chemical speciation of dissolved lead in polluted environments. a case of study: the pontevedra ria (nw spain)
description  Chemical speciation of dissolved lead was determined at four sampling sites in the Pontevedra Ría (NW Spain) by differential pulse anodic stripping voltammetry (DPASV) with a HMDE. Sampling location was chosen due to its evident anthropogenic influence: one sample was taken in the Lérez River mouth (2.2-salinity) and other three samples were taken in the surroundings of the village of Marín (salinity 30–32). Lead concentrations were 0.64 nM (river sample) and 4.8–21.9 nM (saline samples). Speciation results showed that organic chelates of lead, 88–95% of total dissolved lead, are the dominant species of the metal even at these high concentrations. Two types of lead organic complexing ligands were detected in all samples. The river water sample showed the presence of a strong ligand with a concentration of ~7 nM with a conditional stability constant 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 showed similar behavior: a strong ligand (K'Pb-L1 ~ 108.6) with concentration ranging from 33.0 to 53.5 nM, and a weaker complexing ligand (K'Pb-L2 ~ 107.5) with concentration ranging from 32.6 to 50.5 nM. All lead-organic ligand complexes (except the strong complex in the river water sample) showed labile behavior in the time scale of the technique.
publisher Iniversidad Autónoma de Baja California
publishDate 2003
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/178
_version_ 1715723939534077952

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