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# Dissolved Oxygen Lab Abstract

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Introduction

Dissolved Oxygen in the Stream, the Pond and the Bucket Medora Choi, Lily Ge Abstract: The purpose of this laboratory is to investigate and measure dissolved oxygen concentrations in the stream, the pond and the bucket through various procedures. After observing the demonstration in class, we understood the method to check the level of dissolved oxygen. We held our investigation in the woods nearby Phillips Academy Andover. We collected our samples in the stream, the pond and the bucket respectively, all repeating the same method. ...read more.

Middle

The sample is then "fixed". 20ml of the "fixed" sample is added to the test tube. Using the Direct Reading Titrator, fill it with Sodium Sulfate and add it to the "fixed" sample until the orange yellow changes to a faint yellow color. The 8 drops of Starch Indicator Solution added will change the sample to blue color. After titrating the sample, the blue color will disappear. We then have the amount of dissolved oxygen from the Direct Reading Titrator, and having the temperature of the water, the percentage of saturation can be found using the Nomogram. ...read more.

Conclusion

Dissolved Oxygen and Saturation Percentage of Stream, Pond and Bucket Stream Pond Bucket Water Temperature (�C) 12 17.5 18 Oxygen (ppm) Saturation (%) Oxygen (ppm) Saturation (%) Oxygen (ppm) Saturation (%) Average 8.6 77 7.66 78.8 7.64 83 1 7.6 70 7.6 80 8.4 90 2 8.2 75 7.1 72 7 73 3 9 82 7.35 73 8.5 90 4 8.4 77 8.2 85 8.2 86 5 8.1 78 7.4 78 8.4 88 6 8.6 80 8.3 85 7 76 7 - - - - 6 85 Graph 1. Amount of Dissolved Oxygen Graph 2. Percentage of Saturation ...read more.

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