What we did

In order to check the amount of  dissolved oxygen we held our jar in the water for 30 seconds  , put a small vial into the jar to fill , dropped two dissolved tablets into the vial ( the water should be overflowing ) , then mixed inside the vial for about 4 minutes until both of the tablets were no longer visible , waited 5 minutes for the colour of the water to change and then we compared it to our DO Colour chart. Dissolved oxygen is important in the water for aquatic plants and animals to breathe . If a stream has a high level of dissolved oxygen then more aquatic plants and animals will thrive with low amounts life won't be as sustainable .The only animals that will thrive are pollution tolerant BMI like worms and leeches . Our results from this test was 4 ppm and based on the chart the above chart their is only a 12-24 hour tolerance  and it has stressful conditions which means very little life would be able to survive in the stream .

  Dissolved oxygen test kit

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