Fottea

Czech Phycology 4: 191-201, 2004

Vliv mineralizace vzorku na citlivost řasového biotestu [in Czech]

The influence of sample mineralization on algal bioassy
sensitivity

Vladimír Kočí¹, Hynek Beneš¹, Petr Hašler²

¹ Institute of Chemical Technology in Prague, Department of Environmental Chemistry, Technická 5, 166 28 Prague 6, Czech Republic.

² Department of Botany, Faculty of Science, Palacký University, Šlechtitelů 11, CZ-783 71 Olomouc-Holice

The effect of variable salinity on toxicity response of planktonic green alga- Scenedesmus subspicatus to heavy metals (especially on chrom VI) exposition was determined. Scenedesmus subspicatus was cultivated in suspension culture based on ISO guideline and salinity gradient was arranged by anorganic salt mixture. Salt mixture was based on composition of marine water. The algae were grown at salinity 0.006 mol.l^-1, 0.031 mol.l^-1, 0.056 mol.l^-1, 0.082 mol.l^-1 and 0.107 mol.l^-1. At all chosen salinity levels a dose-response curves of S. subspicatus exposed to K2Cr2O7 were determined. The results demonstrated an important decrease of sensitivity of algal biomass at salinity level 0.031 mol.l^-1. At this salinity the presence of K₂Cr₂O₇ did not inhibit growth of algae, even at higher concentrations. Chelates of Cr₂O₇ anion are not expected because the chelation processes are common with Cr³⁺ ion.

Published: March 1, 2004  Show citation