The article presents the application of isotope methods in the study of groundwater transport processes in the unsaturated zone of Selniška Dobrava coarse gravel aquifer. Emphasis is given to the use of environmental isotopes as natural tracers in the study of groundwater dynamics in the unsaturated zone. The estimation of groundwater flow characteristics was based on experimental work in lysimeter. Based on long-time isotope investigations with the use of lumped parameter models some water flow parameters (mean residence time, mean matrix flow velocity) in the unsaturated zone were calculated.
We used quantumchemical methods to study seven possible mechanisms of monoamine oxidase B (MAOB) inhibition by selegiline and rasagiline considering neutral, cationic, anionic and radical mechanisms. Our calculations, performed at the B3LYP/6311++ G(2d,2p)//B3LYP/631+ G(d) level of theory, with application of the CPCM solvent reaction field with = 4 to mimic the polar environment, found that a polar anionic mechanism, involving deprotonation of the inhibitor molecule at the terminal acetylene carbon atom, is the most plausible way for rasagiline and selegiline to inhibit MAOB.
Modelling of hydrological processes in karst aquifers is one of the biggest challenges in the field of hydrogeology. The paper presents conceptual approach of modelling that describes hydrological processes with combination of physically-based and empirical equations. This approach enables use of existing knowledge and data and simplification for those processes that cannot be accurately described. For the use in water management, modelling approach, which has been successfully tested in complex karst aquifer system, could be adapted to many other karst water resources.
The attention of numerous researches has been recently focused on the determination of pharmaceuticals and other persistent chemicals in the environment. The substances enter groundwater either thorough direct dischargeor indirectly (through surface or waste water). Pharmaceuticals in groundwater can be regarded as artificial tracers that enable the evaluation of general anthropogenic influence on the environment and identification of the most vulnerable areas of aquifers. The article presents the properties of distribution of caffeine, carbamazepine and propyphenazone in the area of Ljubljansko polje and Ljubljansko barje. Ljubljansko polje and Barje are important drinking water resources. These pollutants are indicators of sewage system efficiency, however, in urban areas without sewage they indicate the aquifer's ability of natural attenuation.
The article provides an overview of emerging organic pollutants (EOC) detection research in the world and the review of Slovenian studies dealing with the determination of wide spectrum of EOC presence in groundwater and waste water. These compounds are drug residues, substances originating from personal care products, pesticides, veterinary products, food additives, nanomaterials, industrial and other compounds which have been only recently determined as pollutants. The article describes the main sources and the presence of EOC in groundwater, pathways and potential impacts (risks).