Preliminary toxicity tests using the green alga, Ankistrodesmus falcatus

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The freshwater green alga Ankistrodesmus falcatus was cultured in increasing concentrations of Cr, Hg, Cd, Zn, and Al to evaluate the effect of these cations on its growth. Algal growth was estimated by absorbance at 750 nm. Potassium dichromate was used as reference for test reproducibility. The EC...

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Detalles Bibliográficos
Autores principales: Magdaleno, A., Gomez, C.E., Vêlez, C.G., Accorinti, J.
Formato: JOUR
Materias:
Ankistrodesmus falcatus
Freshwater
Green alga
Heavy metals
Toxicity
aluminum
chromium
dichromate potassium
heavy metal
lead
mercury
zinc
article
ecotoxicology
green alga
plant growth
priority journal
reference value
toxicity testing
water pollution
algae
Ankistrodesmus
Chlorophyta
Podohedriella falcata
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_10534725_v12_n1_p11_Magdaleno
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
Descripción
Sumario:The freshwater green alga Ankistrodesmus falcatus was cultured in increasing concentrations of Cr, Hg, Cd, Zn, and Al to evaluate the effect of these cations on its growth. Algal growth was estimated by absorbance at 750 nm. Potassium dichromate was used as reference for test reproducibility. The EC50 for 3 tests was 1.890 mg L-1 with a coefficient of variation of 40.25%. The 96 h static EC50's for heavy metals (in mg L-1 of nominal concentrations) were as follows: Cr6+/K2Cr2O7, 1.050; Hg2+/Hg(SCN)2, 0.162; Hg2+/HgCl2, 0.074; Cd2+/CdCl2·H2O, 0.292; Zn2+/ZnSO4·7H2O, 2.432; and Al3+/Al2(SO4)3·18H2O, 0.904. Thus yielding a toxicity series such that Hg > Cd > Al > Cr > Zn. These preliminary results suggest that bioassays using A. falcatus could be suitable for evaluating the toxicity of heavy metals in freshwaters.

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