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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
e p
rocess o
fEu
trop
hic
ati
on
fertiliserssewage
(liquid domesticand industrial waste)
mineralsesp. nitrates
mineralsesp. phosphates
eutrophication
algal bloom
competitionfor light
consumers can't consume fast enough
dead plants dead algae
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The process of Eutrophication cont.
dead plants dead algae
detritus
more decomposers
use up oxygenby aerobic respiration
(increased BOD)
aerobes die(invertebrates,
fish, etc)
anaerobic bacteriathrive. ReleaseNH4, CH4, HS2
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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
= Bioaccumulation
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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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http://www.abdn.ac.uk/~nhi904/biocet/index.htm
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