OT_LOPEZ_B8_EXPT6.docx - Experiment No 6 DISSOLVED OXYGEN...

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Experiment No. 6 Dissolved Oxygen Levels in Natural Waters LOPEZ, Jan Kristof G. CM011L – B8 INTRODUCTION Large Bodies of water play a vital role in the community; it provides a place for the aquatic animals such as fishes, squids, shrimps, and other marine life forms that are edible. Given this knowledge, it is crucial for such bodies of water to be clean and some of the indicators considered are studied by experiment. Analysis of water is essential because it is part of giving precautionary measures to the community as to how to respond to unclean or diseased water and what to commodities to avoid for consumption of aquatic creatures. Oxygen could be diffused in various ways from the atmosphere to hydrosphere, one exmple is photosynthesis of aquatic plants . Though oxygen is commonly known to be in gaseous state, oxygen is still essential in water because it is consumed by marine animals for respiration. Ambient temperature, atmospheric pressure, and ion activity are considered when approximating the concentration of dissolved oxygen in water. It is very crucial to know the concentration of the dissolved oxygen because it is considered for knowing the quality of a water. If desirable levels of concentration of dissolved oxygen, many kinds of aquatic organisms’ survival will increase. One cricumstance would be the fish will die if the dissolved oxygen is normally below 4 mg/L. Lack of oxygen could also be the cause of death of marine animals not just toxic waste. Water without an desirable amount of dissolved oxygen will undergo anaerobic decay. Dissolved oxygen levels that drop to less than 5 ppm could be dangerous to the aquatic life The experiment the analysis of oxygen concentrations of water features a titration technique. The objectives of this experiment includes developing a proper technique for obtaining a natural water sample, and determination of the dissolved oxygen concentration of a natural water sample and application of the Winkler method to the chemical reactions involved in fixing and analyzing a water sample for dissolved oxygen EXPERIMENTAL SECTION Chemicals The chemicals used by the experimenters are MnSO 4 solution, KI- NaN 3 solution, and Sulfuric acid (H 2 SO 4 ). These solutions are added to the sample respectively and the resulting solution now has a slight yellow-brown color due to the presence of I 3 - . Also, the experimenters used sodium thiosulfate Na 2 S 2 O 3 in titration process that became light
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yellow in color. Then, as an indicator starch solution was used that will provides a direct
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