Cadmium toxicity in tadpoles of Rhinella arenarum in relation to calcium and humic acids

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 ca...

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Autores principales:	Mastrángelo, M., Dos Santos Afonso, M., Ferrari, L.
Formato:	JOUR
Materias:	Cadmium Calcium Chemical modeling Humic acids Rhinella arenarum cadmium calcium humic acid bioassay biological uptake inhibition speciation (chemistry) toad toxicity article cadmium poisoning chemical analysis chemical model competitive inhibition concentration (parameters) controlled study ecotoxicity frog nonhuman priority journal tadpole Animals Bufonidae Humic Substances Larva Models, Chemical Water Pollutants, Chemical
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_09639292_v20_n6_p1225_Mastrangelo
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

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spelling	todo:paper_09639292_v20_n6_p1225_Mastrangelo2023-10-03T15:54:25Z Cadmium toxicity in tadpoles of Rhinella arenarum in relation to calcium and humic acids Mastrángelo, M. Dos Santos Afonso, M. Ferrari, L. 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 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. Fil:Ferrari, L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_09639292_v20_n6_p1225_Mastrangelo
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	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
spellingShingle	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 Mastrángelo, M. Dos Santos Afonso, M. Ferrari, L. Cadmium toxicity in tadpoles of Rhinella arenarum in relation to calcium and humic acids
topic_facet	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
description	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.
format	JOUR
author	Mastrángelo, M. Dos Santos Afonso, M. Ferrari, L.
author_facet	Mastrángelo, M. Dos Santos Afonso, M. Ferrari, L.
author_sort	Mastrángelo, M.
title	Cadmium toxicity in tadpoles of Rhinella arenarum in relation to calcium and humic acids
title_short	Cadmium toxicity in tadpoles of Rhinella arenarum in relation to calcium and humic acids
title_full	Cadmium toxicity in tadpoles of Rhinella arenarum in relation to calcium and humic acids
title_fullStr	Cadmium toxicity in tadpoles of Rhinella arenarum in relation to calcium and humic acids
title_full_unstemmed	Cadmium toxicity in tadpoles of Rhinella arenarum in relation to calcium and humic acids
title_sort	cadmium toxicity in tadpoles of rhinella arenarum in relation to calcium and humic acids
url	http://hdl.handle.net/20.500.12110/paper_09639292_v20_n6_p1225_Mastrangelo
work_keys_str_mv	AT mastrangelom cadmiumtoxicityintadpolesofrhinellaarenaruminrelationtocalciumandhumicacids AT dossantosafonsom cadmiumtoxicityintadpolesofrhinellaarenaruminrelationtocalciumandhumicacids AT ferraril cadmiumtoxicityintadpolesofrhinellaarenaruminrelationtocalciumandhumicacids
_version_	1782028389866012672

Cadmium toxicity in tadpoles of Rhinella arenarum in relation to calcium and humic acids

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