0
Topic 5
Pollution Management
5.8 Acid Deposition

http://www.youtube.com/watch?v=v09KnqiYi-c
Acid Rain
• NOx andSOx may either fall to the ground as
particles, aerosols or gases (dry deposition) or
else forms acid r...
Effects of Acid Rain
• Lakes
–
–
–
–
–

Reduced biodiversity
Acidity may cause death of fish fry
Decreased turbidity
Growt...
Distribution of Acid Deposition
•
•

•
•
•

•
•

It is a global rather than localised problem, since
deposition may occur ...
Management Strategies
• Prevention
–
–
–
–
–
–
–

Burn less fossil fuels
Reduce numbers of private vehicles
Increased use ...
Questions
1. Describe how acid rain is caused
2. Describe the effects of acid deposition on
living things
3. Describe and ...
Upcoming SlideShare
Loading in...5
×

Summary of topic 5.8

1,138

Published on

IB Environmental Systems and Societies

Published in: Education
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total Views
1,138
On Slideshare
0
From Embeds
0
Number of Embeds
3
Actions
Shares
0
Downloads
11
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

Transcript of "Summary of topic 5.8"

  1. 1. Topic 5 Pollution Management 5.8 Acid Deposition http://www.youtube.com/watch?v=v09KnqiYi-c
  2. 2. Acid Rain • NOx andSOx may either fall to the ground as particles, aerosols or gases (dry deposition) or else forms acid rain (wet deposition) • The longer they remain suspended in the air, the more likely they will be oxidised to HNO3 and H2SO4 • Wet deposition may occur thousands of kilometres from the pollution source (especially now that chimney stacks may be hundreds of metres tall)
  3. 3. Effects of Acid Rain • Lakes – – – – – Reduced biodiversity Acidity may cause death of fish fry Decreased turbidity Growth of white moss on lake beds Increased concentrations of dissolved metals (including Cd2+, Cu2+, Al3+, Zn2+, Pb2+) – this makes them bioavailable to water plants and also allows them to enter drinking water • Forests – Damage to lipids and membranes leading to plant death – SOx interferes with photosynthesis especially in coniferous plants – Acidity causes conifers to shed needles too rapidly – Low soil pH causes damage to root hairs and and inhibits water and nutrient uptake
  4. 4. Distribution of Acid Deposition • • • • • • • It is a global rather than localised problem, since deposition may occur thousands of kilometres from source There are natural sources of acidity, including plants which acidify soils (heather and bog moss), volcanic eruptions and the dissolution of carbon dioxide in precipitation (carbonic acid) There also exist natural sources of buffering, including chalk and limestone deposits Conversely, granite deposits are naturally acidic and have low buffering capacity The areas most affected by anthropogenic acid deposition are Sweden, Norway, Denmark, Scotland, Germany, The Netherlands, Austria and The East Coast of the U.S. This appears to be largely due to prevailing winds and levels of rainfall They are also areas rich in lakes and rivers with
  5. 5. Management Strategies • Prevention – – – – – – – Burn less fossil fuels Reduce numbers of private vehicles Increased use of public transport and bikes Switch to low emission fuels (or electric cars?) Remove sulphur before combustion or SOx after (scrubbing) Burn coal with a neutralising agent (such as limestone) Use chemicals to buffer soil and allow decomposition of plants to offset the acidification process – International agreements are necessary since the polluter and the victim of the pollution may be different countries (e.g. The Gothenburg Protocol, 1999)
  6. 6. Questions 1. Describe how acid rain is caused 2. Describe the effects of acid deposition on living things 3. Describe and evaluate strategies to control acid rain
  1. A particular slide catching your eye?

    Clipping is a handy way to collect important slides you want to go back to later.

×