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Acid Rain and buffering capacity of lakes.

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Quimicos Atómicos

on 4 December 2014

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Transcript of Acid Rain and buffering capacity of lakes.

Reactions...
The acid rain is originated by...
What is the acid rain?
Effects in the ecosystem
Effects of acid rain...
Created by Group 1
Antonio Arribas Pérez

Débora Barranca Cisternes

Inés Barras García

Nicole Cáceres Bobadilla

Ricardo Calzadilla Cortez

Acid Rain and buffering capacity of lakes.
Given the connections between the many fish, plants and other organisms living in an aquatic ecosystem , changes in pH levels or aluminum also affect biodiversity and food chains . A consequence of this, and as the aqueous media become more acidic , are decreasing the amount and kinds of organisms living in these waters .
Effects in surface waters and aquatic animals...

In the Beginnings of XIX century, Robert Angus Smith discovered a new environmental phenomenon related with the Industrial boom in Manchester city...
Present day, the most representative case is the reduction of pH in lakes of Adirondack mountains.
Human activity; metallurgic industry.


Natural causes; volcanic eruption.
Produced by emissions of SO2 , (CH3)2s, H2S
In the atmosphere, sulfure dioxide is oxidized by molecular oxygen to form sulfur trioxide.
S + O2 -> SO2 + OH· -> HOSO2· + O2 -> HO2· + SO 3

The molecule of sulfur trioxide reacts with atmospheric water...
Following the same mechanism, the nitrogen dioxide is oxidized to nitrogen trioxide...
All these combustion processes are carried, then react, precipitate and are returned to the earth's surface. There are two types:
dry sedimentation
wet sedimentation

It is causing acidification of lakes and streams, damaging trees, accelerates the deterioration of building materials, old buildings, statues ...
Particularly affects waters, whose adjacent soils have low buffering capacity . Therefore when this water get in the lake, it can´t be neutralized.

In areas with low buffering capacity, acid rain liberate aluminum from soil, which will go lakes and streams. This aluminum is highly toxic to many aquatic organisms.

Fish and aquatic organisms

The acid rain passes through a basin -> liberate Al

decrease in pH is toxic for fishes and other organisms

Suffer a weight reduction, and get a lower capacity for compete for food and habitat.

pH = 5, most of the fishes eggs won´t born.

If lower the pH, some adults fishes dies
New York
In the Adirondack mountains, pH levels
have changed in the last 40 years, due to the limited capacity of the soil tamping
Effects of the acid rain in Adirondack
Effects in the aquatic environment
Effects on forests
Effects on visibility
Effects on human health
Full transcript