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EESA10H3 (100)
Chapter 1

EESA10H3 Chapter Notes - Chapter 1: Particulates, The Transcript, Titanium Dioxide


Department
Environmental Science
Course Code
EESA10H3
Professor
Jovan Stefanovic
Chapter
1

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Supplemental Material Notes
Lecture 5: Heavy Metals
Case Study: CCA (Chromated Copper Arsenate) wood preservative
Reduce need for forest cutting as they preserve and prolong the life of products made
from wood
CCA comes in three types. A ,B , and C which is used exclusively in North America
Type C: contains 47.5% Cr03, 18.5% CuO, and 34% As2O5
When it is dissolved in water it becomes very acidic with a pH balance of 1.8
All of these inorganic components combine together become almost insoluble when
impregnated into the wood. This is known as fixation.
When the active ingredients of CCA become fixed into the wood, they become resistant
to leaching
, some portion of the CCA components is not completely fixed when wood products are
placed in service. This causes the inorganic compounds to be leached into the soil and
water.
The amount leached depends on rainfall
Water can be contaminated with Cr. As. and Cu
Cu is not as harmful to humans as it is to flora and aquatic plants
Excess of trace elements in soil, even among the essential micronutrients (such as Cu),
could results in phytotoxicity
Factors such as plant species, plant cultivars, plant part and age, ion interactions,
management practices, soil and climatic conditions can affect the ability of plants to
accumulate CCA components
Grassy Narrows:
Mercury is poisoning the first nations people and as a result many of them have died or suffered adverse
health effects. Since the water is contaminated they do not have access to clean drinking water unless they
purchase bottles of filtered water which they have to pay for. Their main source of food is fish however
the fish are contaminated as well and contain traces of mercury. The first nations people food and water
supply is not safe.
1. From which routes were people being exposed to mercury contamination?
the main exposure route was through consumption (either drinking contaminated water or eating
contaminated wildlife such as fish).
2.Which fish species were they catching the most and easting and why this particular fish species?
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walleye is a sport fish (a favorite with anglers for having a large size and providing a lot of meat), the
resident were catching other fish (lake whitefish i believe, correct me if I'm wrong) but they prefer to eat
walleye.
3. How did the mercury contamination occur in Grassy Narrows?
The Red paper upstream had slowly dumped 10 metric tons of mercury into the river system...Paper Pulp
Mill
4. In the video resident mention they are happy logging trucks have not been coming in, why? What
does this have to do with mercury?
the logging trucks have not been coming into clear-cut forests on the grounds of conflict. Stopping these
trucks from entering indigenous territory would effectively halt both deforestation of Aboriginal forests
and would reduce the amount of methyl mercury entering their water system. The idea is that if they are
able to reduce the number of logging trucks by convening a blockade, they will reduce the effluent
entering the Wabigoon River. Fewer trucks entering Grassy Narrows would equate to a mitigation in the
amount of mercury causing harm to the people who were economically reliant on the Wabigoon River.
Mercury ...DDT...and PBC are considered legacy contaminants because they are persistent in the
environment
Lecture 4: Chemical Hazards
An Introduction to Rachel Carson’s Silent Spring - A Macat Geography Analysis:
Focuses on the use of DDT
Affects animals throughout the food chain
Explored bird population
Birds who had eaten insects that possessed DDT in their system would have a larger amount of
DDT via Bioaccumulation.
These birds would then be eaten by other animals...continuing the chain
Liver disease and cancer are effects on humans
Humans should be wary using scientific advancements to solve environmental problems
Uneaten leftovers of DDT can run off into water supplies and affect humans in the long term
Influenced the environmental movement to help stop the use of DDT
Why is it called Silent Spring?
So the main reason why the book was called Silent Spring (this is also mentioned in the video) is because,
there was a massive die off of songbirds (as a result of the bioaccumulation of DDT through the food
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find more resources at oneclass.com
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