The aim of this thesis was to derermine the values of toxic effect of chemical sub-stance chemical on the tested organism Daphnia magna. For testing, these materials were selected: polyaluminiumchloride (PAX 18), its aqueous solution (PAX 19) and potassium dichromate. The thesis is divided into two parts, in the first half I devote to theory of the basic terminology of the issue and the general characterization of the tested organism. In the practical part I focus on the characteristics of the used substances, the course of the tes-ting and the results of the work together with the discussion. Experimental concentrations for PAX 18 were between 1-100 mg.l-1, for PAX 19 10-300 mg.l-1 and for potassium dichromate 40-150 mg.l-1. Testing was perfomed in 3 repeatings with ten individuals + control. 24hEC50 values were: for PAX 18 45,06 mg.l-1, for PAX 19 97,82 mg.l-1 and for potassium dichromate 1,569 mg.l-1. The values of 48hEC50 for PAX 18 byly 22,62 mg.l-1, for PAX 19 37,20 mg.l-1 and for potassium dichromate 0,864 mg.l-1. In all tests, fluctuations in pH and dissolved oxygen content, as well as the number of inhibited individuals, were observed. The results of the observations were plotted and then commented verbally.
Identifer | oai:union.ndltd.org:nusl.cz/oai:invenio.nusl.cz:427918 |
Date | January 2019 |
Creators | Melezínková, Petra |
Source Sets | Czech ETDs |
Language | Czech |
Detected Language | English |
Type | info:eu-repo/semantics/masterThesis |
Rights | info:eu-repo/semantics/restrictedAccess |
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