aims of the session: learn about fertilisers and their effects on the environment. be able to answer...
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Aims of the session:
• Learn about fertilisers and their effects on the environment.• Be able to answer exam questions on the effects.• Learn about Pesticides and their effects• Summarise the key points about pesticides
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Fertilisers and Pesticides
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Fertilisers
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Th
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The process of Eutrophication cont.
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Biochemical Oxygen Demand (BOD).
This measures the rate of oxygen consumption by a sample of water, and therefore gives a good indication of eutrophication. A high BOD means lots of organic material and aerobic microbes, i.e. eutrophication
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The nitrate concentration falls during spring and summer and rises during autumn and winter
Less algal growth as autumn beginsPossibly all plants have died
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Pesticides
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Pesticides
Include:
• Herbicides• Insecticides• Fungicides• Bactericides
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Pesticides
Persistence + Lipid solubility
= Bioacculmulation
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Bioaccumulation
waterzooplankton
0.04 ppmsm all fish0.5 ppm
large fish2 ppm
birds25 ppm
E.g DDT
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