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The relationship between the pH and the Biotic Index of a stream

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Introduction

The relationship between the pH and the Biotic Index of a stream Aim: An investigation to find out the water quality in a stream at three different sites and see whether pH affects the biotic index. Hypothesis: I predict that the stream will be most polluted at the third site which is lowest down the stream, and the stream will be cleanest at the beginning. I think this because at the end of the stream, more pollution has been able to enter into the stream, and at the beginning of the stream, less pollution has entered into the stream. Different forms of pollution which may enter into the stream include fertilizers seeping in through the soil, air pollution from the surroundings and also from human impact through washing detergent and excretion. Due to all these pollutions entering the stream, I predict that the pH level of the water high up in the stream will be less acidic than lower down than in the stream. ...read more.

Middle

x Dragonfly 6 x x x Pond Skater 5 x x Square Gilled Mayfly 7 x Water Measurer 5 x x Water Mite 5 x Water Spider 5 x x Water stick Insect 5 x x Whirligig Beetle 5 x Mean Biotic Index 4.83 5.14 5.25 Water quality Dirty Average Average A table to show the Water Quality comparison with the Biotic Index Water Quality Table Biotic Index Water Quality 1.0-2.9 Very Dirty 3.0-4.9 Dirty 5.0-5.9 Average 6.0-7.9 Clean 8.0-10.0 Very Clean A table to show the pH level Site 1 2 3 pH level 9.0 8.0 5.0 A table to show the pH level, Biotic Index and Water Quality Site 1 2 3 pH level 9.0 8.0 5.0 Mean Biotic Index 4.83 5.14 5.25 Water quality Dirty Average Average Conclusion: To conclude, the table above shows us that a relationship exists between the pH level and the Biotic Index. ...read more.

Conclusion

Not only that, I find that I may have kept the Universal Indicator in the water for not long enough, or possibly too long, which would have caused an incorrect reading of the pH level in the water. To reduce this error, next time, if I use a Universal Indicator again, I will keep the indicator in the water for an exact amount of time, but to make the results more precise, I will use a pH probe. The final problem I came across during this experiment was when I was collecting the various organisms from the stream. I found that I may have not collected enough organisms. To collect more organisms, I should have used various different sizes of nets that way there was a higher chance of collecting smaller organisms which is blind to our eyes and can be seen only under a magnifying glass. If I had collected more organisms, there would have been a possibility of finding a wider spread of variety in organisms, which may have affected the Biotic Index. Macha Cauchois ...read more.

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