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Abstract:

Bioassays were carried out to study the differences in cadmium (Cd) toxicity to premetamorphic tadpoles of Rhinella arenarum, in aqueous solutions with variable contents of calcium in the presence and absence of humic acids, and to analyze the relationship between the free Cd2+ ion concentrations calculated by chemical modeling and the biological results. The correlation analysis of the free Cd2+ concentration calculated by chemical speciation and the analytical Cd yielded a direct relationship between the degree of toxicity and the slope value. The lowest slope was obtained from the treatments with lowest free Cd2+ ion concentration and lowest toxicity, whereas the highest slope was obtained from the most toxic treatment. At comparable concentrations of free Cd2+, intralarval Cd increased as the Ca in the solution decreased. At equal contents of Ca, in the presence of humic acids, the content of Cd in larvae was higher and the toxicity values lower. The results obtained in this study show that waterborne Ca could offer some protection from metal uptake and accumulation by competitive inhibition in the uptake mechanism that involves active transport via cell membrane. In the systems with humic materials, a certain proportion of the Cd present in the solution was associated to them and thus became less bioavailable. © 2011 Springer Science+Business Media, LLC.

Registro:

Documento: Artículo
Título:Cadmium toxicity in tadpoles of Rhinella arenarum in relation to calcium and humic acids
Autor:Mastrángelo, M.; Dos Santos Afonso, M.; Ferrari, L.
Filiación:Programa de Ecofisiología Aplicada, Departamento de Ciencias Básicas, Universidad Nacional de Luján, Rutas Nacionales 5 y 7, Casilla de Correo 221, Luján, Buenos Aires B6700ZBA, Argentina
INQUIMAE y Departamento de Quimica Inorganica, Analitica y Quimica Fisica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, 3 Piso, Pab. II, CABA C1428EHA, Argentina
Consejo de Investigaciones Científicas, Provincia de Buenos Aires, Argentina
Palabras clave:Cadmium; Calcium; Chemical modeling; Humic acids; Rhinella arenarum; cadmium; calcium; humic acid; bioassay; biological uptake; cadmium; calcium; humic acid; inhibition; speciation (chemistry); toad; toxicity; article; bioassay; cadmium poisoning; chemical analysis; chemical model; competitive inhibition; concentration (parameters); controlled study; ecotoxicity; frog; nonhuman; priority journal; Rhinella arenarum; tadpole; Animals; Bufonidae; Cadmium; Calcium; Humic Substances; Larva; Models, Chemical; Water Pollutants, Chemical
Año:2011
Volumen:20
Número:6
Página de inicio:1225
Página de fin:1232
DOI: http://dx.doi.org/10.1007/s10646-011-0667-4
Título revista:Ecotoxicology
Título revista abreviado:Ecotoxicology
ISSN:09639292
CODEN:ECOTE
CAS:cadmium, 22537-48-0, 7440-43-9; calcium, 14092-94-5, 7440-70-2; humic acid, 1415-93-6; Cadmium, 7440-43-9; Calcium, 7440-70-2; Humic Substances; Water Pollutants, Chemical
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09639292_v20_n6_p1225_Mastrangelo

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Citas:

---------- APA ----------
Mastrángelo, M., Dos Santos Afonso, M. & Ferrari, L. (2011) . Cadmium toxicity in tadpoles of Rhinella arenarum in relation to calcium and humic acids. Ecotoxicology, 20(6), 1225-1232.
http://dx.doi.org/10.1007/s10646-011-0667-4
---------- CHICAGO ----------
Mastrángelo, M., Dos Santos Afonso, M., Ferrari, L. "Cadmium toxicity in tadpoles of Rhinella arenarum in relation to calcium and humic acids" . Ecotoxicology 20, no. 6 (2011) : 1225-1232.
http://dx.doi.org/10.1007/s10646-011-0667-4
---------- MLA ----------
Mastrángelo, M., Dos Santos Afonso, M., Ferrari, L. "Cadmium toxicity in tadpoles of Rhinella arenarum in relation to calcium and humic acids" . Ecotoxicology, vol. 20, no. 6, 2011, pp. 1225-1232.
http://dx.doi.org/10.1007/s10646-011-0667-4
---------- VANCOUVER ----------
Mastrángelo, M., Dos Santos Afonso, M., Ferrari, L. Cadmium toxicity in tadpoles of Rhinella arenarum in relation to calcium and humic acids. Ecotoxicology. 2011;20(6):1225-1232.
http://dx.doi.org/10.1007/s10646-011-0667-4