Določanje vsebnosti raztopljenih in neraztopljenih plinov v vodi

Urbanc, Teja (author), Hočevar, Marko (mentor)

Na nastanek kavitacije vpliva kvaliteta vode, ki jo določa količina neraztopljenih plinov v njej. V raziskovalnem delu smo z Van Slykovo napravo iz leta 1917, ki se je sprva uporabljala za določevanje plinov v krvi, želeli določiti, koliko raztopljenih in neraztopljenih plinov se izloči v vodah različne kvalitete. Z omenjeno napravo lahko določamo le skupno količino plinov, torej raztopljenih in neraztopljenih, ki so se po opravljenem eksperimentu izločili iz vode. Rezultate smo ustrezno preračunali in na njihovi podlagi določili količino raztopljenega in neraztopljenega kisika, ki se je izločil iz vode. Ker zgolj s to metodo ne moremo določiti vsebnosti raztopljenega in neraztopljenega kisika, smo rezultate teh meritev združili z meritvami, ki smo jih pridobili z optičnim merjenjem koncentracije raztopljenega kisika. Eksperiment smo izvajali z vzorci deionizirane in vodovodne vode. Na podlagi meritev smo ugotovili, da ima vodovodna voda večji delež neraztopljenega kisika. Neraztopljeni plini se nahajajo v mikromehurčkih oziroma so ujeti v kavitacijska jedra, zato lahko na podlagi rezultatov, pridobljenih iz eksperimentalnega dela, podamo ugotovitev, da se kavitacija pogosteje pojavlja v vodovodni vodi.

• Language: Slovenian
• Keywords: kavitacija, optični merilni senzor kisika, raztopljeni plini, topnost plinov, Van Slykova naprava
• Work type: Bachelor thesis/paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: FKKT - Faculty of Chemistry and Chemical Technology
• Year: 2019
• PID: 20.500.12556/RUL-109458
• COBISS.SI-ID: 1538309827
• Publication date in RUL: 03.09.2019

Secondary language

• Language: English

Abstract

The formation of cavitation is influenced by the quality of the water, which is determined by the amount of dissolved gases in it. In our research work we wanted to determine, how much dissolved and undissolved gases are excreted in waters of varying quality. We worked with the Van Slyke apparatus from 1917, which was initially used to determine blood gases. With this device we can only determine the total amount of gases, that is dissolved and undissolved, which have been eliminated from the water after the experiment. The results were also appropriately calculated, so we could determine the amount of dissolved and undissolved oxygen that was released from the water. Because dissolved and undissolved oxygen content can’t be determined only by this method, we combined the results of these measurements with those obtained by optical measurement of dissolved oxygen concentration. The experiment was carried out with samples of deionized and tap water. Based on measurements, we found out that tap water has a higher proportion of undissolved oxygen. The undissolved gases are located in the microbubbles or are trapped in the cavitation core, therefore, based on the results obtained from the experimental work, we can conclude that cavitation occurs more frequently in tap water.

• Keywords: cavitation, dissolved gases, optical oxygen sensor, solubility of gases, Van Slyke apparatus