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Dissolved Oxygen Essay

1979 Words8 Pages

Determination of Dissolved Oxygen (DO) in Water

King Ma

United International College

Abstract
The oxygen in the water play an important role in the biological aspect, and scientist named it dissolved oxygen (DO). The level of dissolved oxygen in water will affect the living organisms, other material reaction in the water and the environment as will. Dissolved oxygen also as an important measurement of the water quality, is related to many other factors, which make the sampling is a serious problem if we want to determine the DO in water. This paper is an experiment review of determine the dissolved oxygen in water by using the Winkle method, and the experiment used one standard solution, two sample solutions. The preliminary …show more content…

The concentrations of dissolve oxygen have a close relationship with temperature, and partial pressure. The basic rule of the dissolved oxygen is dissolved oxygen will increase with the drop of temperature, because DO will not change much in the normal air which makes the temperature become a more important …show more content…

Next, add the potassium iodide within the solution been acidified by the manganic hydroxide, 2 Mn(OH)3(s) + 3 I - (aq) + 6 H+(aq) => I3 - (aq) + 6 H2O(l) + 2 Mn2+(aq). Then, use S2O3 2- as a starch indicator with add the sodium thiosulfate. 2 S2O3 2- (aq) + I3 - (aq) => S4O6 2- (aq) + 3 I- (aq). From that reactions, it can get the ratio of oxygen, iodide, and thiosulfate ions, which equal to 1:2:4. (Dunnivant,

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