PT Journal AU Koci, V Benes, H Hasler, P TI Vliv mineralizace vzorku na citlivost rasoveho biotestu [in Czech] SO Czech Phycology PY 2004 BP 191 EP 201 VL 4 IS 1 AB 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. ER