QUANTITATIVE DETERMINATION OF DISSOLVED OXYGEN IN THE WATER OF SOME LAKES OF THE ABSHERON PENINSULA

Oxygen is one of the most important dissolved gases, constantly present in surface waters, the regime of which largely determines the chemical and biological state of water bodies. Oxygen consumption in water is associated with chemical and biochemical processes of oxidation of organic and some inorganic substances (Fe2+, Mn2+, NH4+, H2S, CH4, H2, etc.), as well as with the respiration of aquatic organisms. The rate of oxygen consumption increases with increasing temperature, the number of bacteria and other aquatic organisms and substances subject to chemical and biochemical oxidation. Dissolved oxygen in surface waters is in the form of O2 molecules. In the case of high intensity of photosynthesis, water can be significantly oversaturated with oxygen. In this case, some of it can pass into gaseous form. The aim of the research work was to develop a method for determining the oxygen content in the water of some Absheron lakes and to determine the living conditions of organisms in the studied water bodies based on the oxygen content. For this purpose, water samples were taken from the lakes Masazyr, Bulbule, Zykh, Kurdekhany, Gumyatagh, Yasamal, Gyrmyzy, Gu, Binegedi, Lokbatan, Khojasen and the amount of dissolved oxygen was determined in these water samples. It was found that the solubility of oxygen in these water bodies increases with decreasing temperature and mineralization. The determination of the amount of dissolved oxygen, temperature, pH, and electrical conductivity in water samples from the lakes Masazyr, Bulbule, Zykh, Kurdekhany, Gumyatagh, Yasamal, Gyrmyzy, Gu, Binegedi, Lokbatan, Khojasen was established using the device “Water Quality Meter” 850081. Keywords: dissolved oxygen, water sample, mineralization, Lake Yasamal, electrical conductivity.