Both of these scenarios create troubling conditions for animal life in the water. It is not the oxygen that is part of the water molecule but rather oxygen gas. DO levels represent the amount of oxygen that is dissolved and dispersed throughout a water sample. When plants and animals die or excrete waste, this nitrogen is released into the environment as NH4+ (ammonium). Every aquatic animal needs to be able to breathe. Much of the dissolved oxygen in water comes from the atmosphere. Dissolved oxygen alludes to the level of free oxygen not bonded to any existing molecule in the water or other liquid substances. In these conditions, algae will grow rapidly, which results in the water appearing to be green on the surface. It is However, high DO levels speed up corrosion in water pipes. If the experiment was repeated, an improvement would be to take pictures of the solution at each minute to make comparing oxygen levels easier. Amazon.com: dissolved oxygen in drinking water. Dissolved oxygen is the oxygen present in water available to aquatic organisms. Dissolved oxygen levels are also too low when you get towards the bottom of the lake or river. The aeration of water can be caused by wind (creating waves), rapids, waterfalls, ground water discharge or other forms of running water. This ammonium is eventually oxidized by bacteria into nitrite (NO2-) and then into nitrate. Dissolved oxygen (DO) is the amount of oxygen that is present in water. Oxygen levels that remain below 1-2 mg/l for a few hours can result in large fish kills. The presence of oxygen in water is a good sign. In conclusion, salinity is an important water quality parameter because it plays an important role in organism’s osmoregulation, and salt can dissociate and form more toxic substances. Low dissolved oxygen concentrations can arise through natural phenomena that include seasonality, changes in river flow, and both saline and thermal stratification of the water column. Temperature is also an important ecological factor. Odor (MCL 3 TON) If the water is acidic or basic the chances of it being polluted is greater and because most organisms are only suited for certain pH levels  . 〖NH〗_4^++1.5O_2 →〖NO〗_2^- +H_2 O+2H^+ ------------Equation, A chloride concentration in Nakkavagu Lake was noticed 50 mg/L. First, there are wet chemical techniques, where a water sample is collected and then subject to a chemical reaction used to determine the DO level. As dissolved oxygen levels in water drop below 5.0 mg/l, aquatic life is put under stress. A new catalytic polymer has been synthesized that has immediate application to drinking water treatment. How to Measure Dissolved Oxygen . Our hypothesis was correct that the salinity of the pond. It is an important parameter in assessing water quality because of its influence on the organisms living within a body of water. Photosynthesis: in presence of light and chlorophyll green plants and some bacteria produce Oxygen and glucose by using carbon-di-oxide and water. In limnology (lakes studies), dissolved oxygen is a crucial factor second only to water itself. For animal life to properly survive, DO rates in the water should be moderately high. DO levels rise from morning through the afternoon as a result of photosynthesis, reaching a peak in late afternoon. For low-pressure boilers, the PPM of DO that’s found in the water will be at 2.0 or less. Water used in very low pressure boilers have no more than 2.0 ppm of DO, but most boiler plant operators try to keep oxygen levels to 0.007 … Micro organisms may decompose organic substances in water by means of oxygen. A question that could be studier further would be: how does the pH 8 denature the enzyme and stop the reaction from taking. 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