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This bachelor thesis reviews the data on the distribution of arsenic in surface and underground natural waters of the Czech Republic. In addition the thesis focuses on the occurrence of anomalous arsenic concentrations and tries to detect sources of arsenic contamination. Results of the thesis suggest high quality of the surface and groundwater in the Czech Republic with respect to arsenic. Its anomalous concentrations in the natural waters in Czech Republic have been rarely documented only in areas with strong anthropogenic impact and in areas affected by historical mining operations. Keywords: Arsenic, toxicity, contamination, surface water, groundwater, Czech Republic

For my Bachelors´ thesis I have chosen the topic {\clqq}Ammonia release from industrial cooling systems´as there is, at the present time, a constant threat of risk from consequential accidents in indrustrial cooling systems which dispose with the cooling medium {--} ammonia. In the introduction of my thesis, I focused on the issue of the prevention of the amonia release risks from the viewpoint of current precepts of law {--} with a view to compiling technical and operational documentation and ensuring qualifications of for device handling. The thesis also contains the characteristics and description of amonia as a dangerous substance with concentration on its toxicity and possible toxic consequences on human beings (including inhabitants of the neighbourhood). Furthermore, I have also mentioned the means of protection which must be available to the cooling system attendants at the workplace. In the practical part of my thesis, I compiled a scenario of ammonia release from the original cooling system of Madeta Pelhrimov plc and from their current modern system. I have demonstrated the suitability of the technical design of the cooling system regarding the possibilities and risks of the coolant {--} ammonia {--} release by the comparing of these scenarios. For the purpose of achieving the objective of my thesis, I have used all the available technical data from company documentation and whilst processing the model situation of the largest and alternative ammonia release from the apparatus, I took from a model programme {\clqq}MODEL RISK MANAGEMENT PROGRAMME AND PLAN FOR AMMONIA REFRIGERATION`` which was compiled in the USA.