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Detecting & Monitoring Pollution Why is it necessary to detect and monitor pollution? What are the impacts of pollution? How can pollution be detected.

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Presentation on theme: "Detecting & Monitoring Pollution Why is it necessary to detect and monitor pollution? What are the impacts of pollution? How can pollution be detected."— Presentation transcript:

1 Detecting & Monitoring Pollution Why is it necessary to detect and monitor pollution? What are the impacts of pollution? How can pollution be detected and monitored?

2 WHAT ARE THE IMPACTS OF POLLUTION? The impacts of pollution can vary greatly, depending on a number of factors. This makes detection, monitoring & management often difficult. source type amount distribution (spatial extent) environment frequency Compare two pollutants of your choice (e.g. organic waste and noise) identify the most common sources & pathways describe the biological effects / impacts evaluate the need for management identify possible methods to detect & monitor each pollutant

3 DIRECT vs INDIRECT METHODS OF POLLUTION DETECTION & MONITORING Pollution can be measured directly or indirectly. Direct measurements record amount of pollutant present (in water/air/soil). Indirect measurements record changes to abiotic or biotic factors, caused by pollutants. DirectIndirect E.g.Acidity of rain waterO 2 content of water  Be able to describe a method of pollution detection and monitoring for: - Air- soil- water

4 INDIRECT METHODS (recording the changes in biotic or abiotic components) Biochemical oxygen demand (BOD): a measure of the amount of dissolved oxygen required to break down organic material in a given volume of water (through aerobic biological activity of micro-organisms) measuring rate of oxygen uptake is a standard indirect pollution detection method greater BOD level = greater no of oxygen consuming microbes = greater amount of organic pollutant Biotic index: Consider: tolerance diversity abundance indicator species comparison of polluted and unpolluted site (e.g. upriver/downriver)

5 Biotic Indices An indirect method of measuring pollution Indicator species: plants or animals that show something about the environment by their presence, abundance or scarcity Biotic Index: a scale 1-10 that gives a measure of the quality of an ecosystem by the presence or abundance of the species living in it. BOD = Instant measure of pollution Indicator Species = recent history

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