A5084057325- Pharmaceutical and Antibiotic Environmental Impacts
- Advanced oxidation water treatment
- Pesticide and Herbicide Environmental Studies
- Environmental Toxicology and Ecotoxicology
- Chemistry and Chemical Engineering
- Water Quality Monitoring and Analysis
- Antibiotic Resistance in Bacteria
- Isotope Analysis in Ecology
- Marine and coastal ecosystems
- Photopolymerization techniques and applications
- Antibiotics Pharmacokinetics and Efficacy
- Advanced Photocatalysis Techniques
- Analytical chemistry methods development
- Atmospheric chemistry and aerosols
- Effects and risks of endocrine disrupting chemicals
- Pesticide Residue Analysis and Safety
- Optical Coatings and Gratings
- ZnO doping and properties
- Mass Spectrometry Techniques and Applications
- Copper-based nanomaterials and applications
- Toxic Organic Pollutants Impact
- Radical Photochemical Reactions
- Catalysis and Oxidation Reactions
- Microplastics and Plastic Pollution
- Heavy metals in environment
University of South Bohemia in České Budějovice
1997-2024
Sewanee: The University of the South
2012-2024
Nemocnice České Budějovice
2024
University of Maine
2005
Institute of Hydrobiology, Biology Centre, Academy of Sciences of the Czech Republic
1994
Institute of Landscape Ecology of the Slovak Academy of Sciences
1990
Photochemical liberation of allochthonous organically bound aluminum (Al) and iron (Fe) in-lake hydroxide precipitation are important sources these metals to lake sediments. Mass budgets ionic Al Fe (Ali, Fei), (Alo, Feo), particulate (Alp, Fep) were measured for two western Czech Republic forest lakes (Plešné Čertovo) in the 2000−2003 hydrological years. The net sinks Ali, Alo, Feo Alp Fep. average Alo inputs from terrestrial (66−110 12−17 mmol m-2 yr-1, respectively, on a area basis)...
The aim of this paper is to investigate the properties and photocatalytic activity nanostructured TiO 2 layers. glancing angle deposition method with DC sputtering at low temperature was applied for layers various columnar structures. thin-film structure surface morphology were analyzed by XRD, SEM, AFM analyses. films determined rate constant decomposition Acid Orange 7. In dependence on parameters, three types structures obtained. feature anatase/rutile and/or amorphous depending film...
Toxicity in reaction mixtures of atrazine irradiated on immobilized TiO2 at varying irradiation times was studied using an algal growth test unicellular green alga Raphidocelis subcapitata and a cytotoxicity with RTgill-W1 cell line. The toxicity samples to algae decreased exponentially the time up 3 h for both IC50 IC20 values calculated rate inhibition yield. A trend increasing variability between replicates longer periods observed; particularly pronounced 5 hours, where caused moderate...
Alteration of photochemical properties humic substances (HS) by the addition metals abundant in natural waters has been investigated. Excited HS states have characterized fluorescence spectra and laser kinetic spectroscopy. The effect Cu 2+ , Fe Mn explained terms static quenching excited states. In agreement with this, metal ions were found to inhibit sensitized photooxidative degradation chlorophenols.
Atorvastatin, widely prescribed hypolipidemic drug, undergoes rapid, probably self-sensitised, degradation (less than 20% left after 25-minute irradiation) if irradiated by wavelengths 300 - 350 nm in aqueous solution. When ferric ions are added to the reaction mixture, follows first order kinetics with a rate constant of 0.130 min−1. Photochemical may thus represent significant way environmental transformation this pharmaceutical. Toxicity testing atorvastatin and photoproducts performed on...
Cholesterol-lowering drugs, antidiabetics, antiarrhythmics, antidepressants, and antibiotics belong to the most prescribed drugs worldwide. Because of manufacture, excretion, improper disposal leftover enter waste waters and, subsequently, surface waters. They have been detected in all over world, from concentrations ng/l several orders magnitude higher. Since pharmaceuticals are designed be both biologically chemically stable, photochemical degradation by sun radiation represents a way...
<title>Abstract</title> Atorvastatin (ATV) photochemical degradation with radiation relevant to the shortest solar wavelengths reaching Earth’s surface was studied. Fourteen products of photodegradation (P-ATV) were identified by HPLC-HRMS/MS analysis and for twelve them, chemical structures proposed. The suggested include decarboxylated, dehydrated ATV, ether-like phenanthrene-like byproducts. Toxicity assays revealed that exposure ATV had a greater negative effect on growth green algae...
The influence of ferric ions on photoinitiated reaction dioxygen with two carbon organic acids, aldehydes and alcohols related to natural waters was demonstrated. Photocatalytic effect ions, i.e. photochemical reduction Fe(III) as the catalyst generating step, has been found be common principal these reactions. overall quantum yields reactions are in range from 0.3 1.2. A mathematical model designed for mechanism cyclic generation singlet substrate oxidation by O 2 applied system glyoxalic...
Abstract Photochemical degradation of fluoroquinolones ciprofloxacin, enrofloxacin and norfloxacin in aqueous solution under light conditions relevant to surface waters at neutral alkaline pH was found proceed readily with half-lives between 0.9 2.7 min. The products photochemical identified by HPLC-MS included defluorinated, hydroxylated, decarboxylated structures as well opened cyclic structures. For all the studied substances, reaction pathways were influenced significantly system, more...