• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Dissolved Oxygen Lab Abstract

Extracts from this document...


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.


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.


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.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Living Things in their Environment section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Living Things in their Environment essays

  1. An Investigation into the water quality of the River Banwell in

    Below is data about plant and animal life provided by the environment agency. These are both from different years, one from 1990 and the other 2002. 1990 results: Sampling results: Observed Expected Observed/Expected Probability grade % Season code Grade NTAXA 21.00 28.80 .72 ASPT 4.10 4.72 .86 Overall b 2002

  2. I will be working in a freshwater environment measuring certain variables in order to ...

    They can live in most any accumulation of shallow, stagnant water so keeping water from pooling around barns will reduce the number of breeding sites. These have a biological indicator number of 5 as they live well in areas of low oxygen.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work