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ACID DEPOSITION AND FOREST ECOSYSTEMS. Chapter 3.11. Acid Deposition. Technology is great but it also contributes to acid deposition. - PowerPoint PPT Presentation
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Acid Deposition
Technology is great but it also contributes to acid deposition.
Coal-burning plants, cars, and trucks, metal smelters, and oil refineries provide energy, transport, and materials for the industrial world, but at the same time produce oxides of sulfur and nitrogen, among the most dangerous of air pollutants.
The Problem of Combustion
Sulfur dioxide (SO2) and Nitrogen oxides (NOx) are released into the atmosphere by burning fossil fuels.
Sulfur and Nitrogen enter the atmosphere they may combine with water droplets to form acids.
The acids return to the surface of the Earth in the form of snow or rain, called ACID PRECIPITATION.ACID PRECIPITATION.
ACID PRECIPITATION KILLSACID PRECIPITATION KILLS: Fish Soil Bacteria Aquatic Plants Terrestrial Plants
The sulfur and nitrogen oxides released from tailpipes and smokestacks do not always enter the water cycle in the atmosphere.
Sulfur and nitrogen compounds may remain airborne and settle out in the dry state – DRY DEPOSITIONDRY DEPOSITION
Dry Deposition enter the water cycle and form acid as it combines with moisture
CAN BE FOUND:Dew on lawnsSurface of lakesWater inside your respiratory tract
THE EFFECTS OF ACID PRECIPITATION
Direct effects on Humans:Medical effects
Accelerated respiratory problems Examples: Asthma, bronchitis
Cause eyes to waterIrritate skin
Dissolving marble statuesCorroding metalDulling car finishesDamage to buildings
Effects on Ecosystems
Damage to leavesDamaged to tissues of trees become more
susceptible to fungal or bacterial infections.
EFFECTS OF ACID RAIN
Acid Falls to SoilAcid falls to Soil
Kills Bacteria Promotes growth of Moss
Releases Aluminum in the soil
Reduces Nutrients in Trees
Damage tree Roots
Important to
Nitrogen Cycle
pH – Potential Hydrogen A measure of the acidity or alkalinity (basic) in
the solution Measured using pH meter
pH is a scale from 0 – 14 where: 0 – 6.9 = Acidic 7.0 = neutral 7.1-14 = Basic
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14
A pH of 3 is 10 times more acidic than pH of 4
More Acidic More Basic