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Abstract:

The cadmium binding properties of waters of the superior section of the Rio de la Plata estuarine were determined over a three-year period. Samples were collected at different hydrodynamic conditions. The complexing capacity was determined by square wave anodic stripping voltammetry (SWASV). Titration curve data were analyzed using a multivariable regression. Suspended particulate matter (SPM) was identified by XR diffraction and FTIR. These analyses showed that SPM principal components are clays (illite, montmorillonite and chlorite). The study was applied to the untreated, filtered and centrifuged fractions of each sample at the pH of the natural waters and at pH 1. The results show that the contribution of dissolved organic matter to the complexing capacity is negligible when compared with SPM. At natural pH, the complexing capacity of filtered and untreated fractions can be described by considering two kinds of binding sites. The associated conditional binding constants are independent of the concentration of suspended matter. Their average logarithms are ca. 6.5 and ca. 4.4. The total concentration of binding sites (ST) is in μM range, which is about three orders of magnitude higher than that reported for most of the studied estuaries. This difference is explained on the basis of the great amount of SPM. Hydrodynamic conditions produce variations in the concentration and composition of the SPM. At pH 1 samples still exhibit an important complexing capacity with only one binding site with log Kcond ca. 5.4. These differences could be attributed to superficial modifications that take place at very low pH. © 2007 Elsevier Ltd. All rights reserved.

Registro:

Documento: Artículo
Título:Complexing capacity of natural waters carrying a great amount of suspended matter
Autor:Minaberry, Y.S.; Gordillo, G.J.
Filiación:INQUIMAE - Departamento de Quimica Inorganica, Analitica y Quimica Fisica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellon 2, 1428 Buenos Aires, Argentina
Palabras clave:ASV; Cadmium; Complexing capacity; Suspended particulate matter; Cadmium; Fourier transform infrared spectroscopy; Hydrodynamics; pH effects; Regression analysis; Titration; Anodic stripping voltammetry; Complexing capacity; Suspended particulate matter; Water analysis; cadmium; montmorillonite; water; Cadmium; Fourier transform infrared spectroscopy; Hydrodynamics; pH effects; Regression analysis; Titration; Water analysis; cadmium; dissolved organic matter; FTIR spectroscopy; hydrodynamics; suspended particulate matter; X-ray diffraction; anodic stripping potentiometry; article; binding site; complex formation; estuarine species; hydrodynamics; hydrophilicity; infrared spectroscopy; multivariate analysis; pH; suspended particulate matter; X ray diffraction; Aluminum Silicates; Argentina; Filtration; Hydrogen-Ion Concentration; Models, Chemical; Rivers; Spectroscopy, Fourier Transform Infrared; Titrimetry; Uruguay; Water Pollutants, Chemical; X-Ray Diffraction; Rio de la Plata; South America
Año:2007
Volumen:69
Número:9
Página de inicio:1465
Página de fin:1473
DOI: http://dx.doi.org/10.1016/j.chemosphere.2007.04.058
Título revista:Chemosphere
Título revista abreviado:Chemosphere
ISSN:00456535
CODEN:CMSHA
CAS:cadmium, 22537-48-0, 7440-43-9; montmorillonite, 1318-93-0, 61029-13-8; water, 7732-18-5; Aluminum Silicates; clay, 1302-87-0; Water Pollutants, Chemical
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00456535_v69_n9_p1465_Minaberry

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Citas:

---------- APA ----------
Minaberry, Y.S. & Gordillo, G.J. (2007) . Complexing capacity of natural waters carrying a great amount of suspended matter. Chemosphere, 69(9), 1465-1473.
http://dx.doi.org/10.1016/j.chemosphere.2007.04.058
---------- CHICAGO ----------
Minaberry, Y.S., Gordillo, G.J. "Complexing capacity of natural waters carrying a great amount of suspended matter" . Chemosphere 69, no. 9 (2007) : 1465-1473.
http://dx.doi.org/10.1016/j.chemosphere.2007.04.058
---------- MLA ----------
Minaberry, Y.S., Gordillo, G.J. "Complexing capacity of natural waters carrying a great amount of suspended matter" . Chemosphere, vol. 69, no. 9, 2007, pp. 1465-1473.
http://dx.doi.org/10.1016/j.chemosphere.2007.04.058
---------- VANCOUVER ----------
Minaberry, Y.S., Gordillo, G.J. Complexing capacity of natural waters carrying a great amount of suspended matter. Chemosphere. 2007;69(9):1465-1473.
http://dx.doi.org/10.1016/j.chemosphere.2007.04.058