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Determination of the Total Concentration and Speciation of Metal Ions in River, Estuarine and Seawater Samples

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Abstract

Different natural water samples were investigated to determine the total concentration and the distribution of species for Cu(II), Pb(II), Al(III) and U(VI). The proposed method, named resin titration (RT), was developed in our laboratory to investigate the distribution of species for metal ions in complex matrices. It is a competition method, in which a complexing resin competes with natural ligands present in the sample to combine with the metal ions. In the present paper, river, estuarine and seawater samples, collected during a cruise in Adriatic Sea, were investigated. For each sample, two RTs were performed, using different complexing resins: the iminodiacetic Chelex 100 and the carboxylic Amberlite CG50. In this way, it was possible to detect different class of ligands. Satisfactory results have been obtained and are commented on critically. They were summarized by principal component analysis (PCA) and the correlations with physicochemical parameters allowed one to follow the evolution of the metals along the considered transect. It should be pointed out that, according to our findings, the ligands responsible for metal ions complexation are not the major components of the water system, since they form considerably weaker complexes.

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Correspondence to Giancarla Alberti.

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Alberti, G., Biesuz, R. & Pesavento, M. Determination of the Total Concentration and Speciation of Metal Ions in River, Estuarine and Seawater Samples. ANAL. SCI. 24, 1605–1611 (2008). https://doi.org/10.2116/analsci.24.1605

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  • DOI: https://doi.org/10.2116/analsci.24.1605

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