PT  - JOURNAL ARTICLE
AU  - Kočí, Vladimír
AU  - Beneš, Hynek
AU  - Hašler, Petr
TI  - Vliv mineralizace vzorku na citlivost řasového biotestu [in Czech]
DP  - 2004 Mar 1
TA  - Czech Phycology
PG  - 191--201
VI  - 4
IP  - 1
IS  - 18025439
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&lt;sup&gt;-1&lt;/sup&gt;, 0.031 mol.l&lt;sup&gt;-1&lt;/sup&gt;, 0.056 mol.l&lt;sup&gt;-1&lt;/sup&gt;, 0.082 mol.l&lt;sup&gt;-1&lt;/sup&gt; and 0.107 mol.l&lt;sup&gt;-1&lt;/sup&gt;. 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&lt;sup&gt;-1&lt;/sup&gt;. At this salinity the presence of K&lt;sub&gt;2&lt;/sub&gt;Cr&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;7&lt;/sub&gt; did not inhibit growth of algae, even at higher concentrations. Chelates of Cr&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;7&lt;/sub&gt; anion are not expected because the chelation processes are common with Cr&lt;sup&gt;3+&lt;/sup&gt; ion.