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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Hodnocení environmentálního zatížení vázaného na produkci odpadu
 VANĚČEK, Miloslav
Waste management is becoming a social issue. Above all, it is about reducing landfill in the framework of changing legislation. The work focused on the analysis of environmental impacts of landfilled mixed municipal waste in a selected municipality using the LCA (Life Cycle Assement) method using the Ecoinvent database. The most significant impact of waste was in the impact categories of human toxicity and climate change. The individual components of the waste had different impacts within the impact categories. Plastic, fine fraction and textiles with other waste had a significant share in the impacts. In order to reduce environmental impacts, it would be appropriate to optimize the waste management and energy recovery system in the selected municipality.
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Do humic substances reduce nitrite toxicity to fish?
 VANĚČEK, Miloslav
The aim of this work was to verify the hypothesis that humic substances reduce toxicity of nitrite to fish. Under laboratory conditions, tests of acute toxicity were performed on aquarium fish: zebrafish (Danio rerio) and guppy (Poecilia reticulata). Fish were exposed to nitrite in the presence or absence of humic substance HS 1500. Nitrite was dosed as NaNO2. Preparation Dupla Cur (manufacturer Dohse Aquaristik KG) was a source of the humic substance (HS 1500). The preparation was tested in two different concentrations: 0.5 ml.l-1 and 1 ml.l-1. Toxicity tests were performed according to Czech standard ČSN EN ISO 7346-2. Based on the observed mortality in the acute toxicity tests, 96hLC50 values of sodium nitrite for selected species were calculated in the presence or absence of the tested preparation Dupla Cur. Tests on zebrafish showed a positive effect of Dupla Cur preparation at a concentration of 0.5 ml.l-1 on decreasing of nitrite toxicity. In this case 96hLC50 value was about 73 % higher than the value found in the test where the preparation was omitted. At a concentration of 1 ml.l-1 of the preparation a significantly positive effect was not observed. In the tests on guppy, an effect of Dupla Cur preparation on the toxicity of sodium nitrite was not observed. The tested humic substance does not have the same effect on all fish species. The effect depends on its concentration in the water.
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See also: similar author names
3 VANĚČEK, Marcel
12 VANĚČEK, Michal
1 VANĚČEK, Miloš
4 Vaněček, Martin
4 Vaněček, Matěj
12 Vaněček, Michal
9 Vaněček, Milan
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