Topic 4 Pages 213- 221. You need to filter or boil water for at least 5 min to be safe to remove...
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Transcript of Topic 4 Pages 213- 221. You need to filter or boil water for at least 5 min to be safe to remove...
![Page 1: Topic 4 Pages 213- 221. You need to filter or boil water for at least 5 min to be safe to remove Giardia, a parasite. ◦ Causes intestinal illness.](https://reader030.fdocuments.us/reader030/viewer/2022032802/56649de65503460f94adf246/html5/thumbnails/1.jpg)
Topic 4Pages 213- 221
![Page 2: Topic 4 Pages 213- 221. You need to filter or boil water for at least 5 min to be safe to remove Giardia, a parasite. ◦ Causes intestinal illness.](https://reader030.fdocuments.us/reader030/viewer/2022032802/56649de65503460f94adf246/html5/thumbnails/2.jpg)
![Page 3: Topic 4 Pages 213- 221. You need to filter or boil water for at least 5 min to be safe to remove Giardia, a parasite. ◦ Causes intestinal illness.](https://reader030.fdocuments.us/reader030/viewer/2022032802/56649de65503460f94adf246/html5/thumbnails/3.jpg)
You need to filter or boil water for at least 5 min to be safe to remove Giardia, a parasite.◦ Causes intestinal illness or “Beaver Fever”
![Page 4: Topic 4 Pages 213- 221. You need to filter or boil water for at least 5 min to be safe to remove Giardia, a parasite. ◦ Causes intestinal illness.](https://reader030.fdocuments.us/reader030/viewer/2022032802/56649de65503460f94adf246/html5/thumbnails/4.jpg)
Pollutant:◦ Any material, or form of energy, that will cause
harm to a living organism May result in physical, chemical or biological
mechanisms that will threaten the health and survival of an organism
Pollution:◦ Any alteration of the environment producing a
condition that is harmful to living things Ex: DDT
![Page 5: Topic 4 Pages 213- 221. You need to filter or boil water for at least 5 min to be safe to remove Giardia, a parasite. ◦ Causes intestinal illness.](https://reader030.fdocuments.us/reader030/viewer/2022032802/56649de65503460f94adf246/html5/thumbnails/5.jpg)
At what point does the concentration of a pollutant become a problem?
Does it happen when the pollutant causes the immediate death of an organism?
When the pollutant is only somewhat harmful?
Perhaps when the pollutant is present at a level that you can detect?
![Page 6: Topic 4 Pages 213- 221. You need to filter or boil water for at least 5 min to be safe to remove Giardia, a parasite. ◦ Causes intestinal illness.](https://reader030.fdocuments.us/reader030/viewer/2022032802/56649de65503460f94adf246/html5/thumbnails/6.jpg)
When you reduce the concentration of a solution.◦ You ADD water!
![Page 7: Topic 4 Pages 213- 221. You need to filter or boil water for at least 5 min to be safe to remove Giardia, a parasite. ◦ Causes intestinal illness.](https://reader030.fdocuments.us/reader030/viewer/2022032802/56649de65503460f94adf246/html5/thumbnails/7.jpg)
Toxicity◦ Ability of a chemical to cause harm to an organism
Acute toxicity◦ Ability of a chemical to cause harm to an organism
with only one exposure Chronic toxicity
◦ Ability of a chemical to cause harm to an organism only AFTER the chemical accumulates to a specific level after many exposures overtime.
What types of factors affect toxicity in one’s body?◦ Differences in body mass, metabolism, type of
lifestyle
![Page 8: Topic 4 Pages 213- 221. You need to filter or boil water for at least 5 min to be safe to remove Giardia, a parasite. ◦ Causes intestinal illness.](https://reader030.fdocuments.us/reader030/viewer/2022032802/56649de65503460f94adf246/html5/thumbnails/8.jpg)
Common measurement of toxicity Refers to the dose of a chemical that will kill
50% of the population that it is testing.◦ Takes resistance into account
-Table 3.4 (page 218) - Parts per million (ppm)
- This is a way of expressing very dilute concentrations of substances. Just as per cent means out of a hundred, so parts per million or ppm means out of a million.
![Page 9: Topic 4 Pages 213- 221. You need to filter or boil water for at least 5 min to be safe to remove Giardia, a parasite. ◦ Causes intestinal illness.](https://reader030.fdocuments.us/reader030/viewer/2022032802/56649de65503460f94adf246/html5/thumbnails/9.jpg)
Toxin name Source Approximate LD50’s (ppm)
Botulinum toxin A Clostridium botulinum bacterium
0.00000003
Tetanus toxin A Clostridium tetani bacterium
0.000005
Dioxin Contaminant in some herbicides and in PCB’s
0.03
Nicotine Cigarette smoke 0.86
Strychine Pesticide 5.0
Solanine Potatoes 6.0
Chlordane Insecticide 40.0
Dieldren insecticide 80.0
![Page 10: Topic 4 Pages 213- 221. You need to filter or boil water for at least 5 min to be safe to remove Giardia, a parasite. ◦ Causes intestinal illness.](https://reader030.fdocuments.us/reader030/viewer/2022032802/56649de65503460f94adf246/html5/thumbnails/10.jpg)
https://www.youtube.com/watch?v=QkpA0IJV_n0
Describe both sides – careful conservation vs. geoengineering
Choose your position. Write a supporting paragraph.
![Page 11: Topic 4 Pages 213- 221. You need to filter or boil water for at least 5 min to be safe to remove Giardia, a parasite. ◦ Causes intestinal illness.](https://reader030.fdocuments.us/reader030/viewer/2022032802/56649de65503460f94adf246/html5/thumbnails/11.jpg)
1. Why is it difficult to establish risks for chemical exposure? (list 4)
2. Why is thalidomide an issue?3. Describe the controversy of the LD50 in
caffeine.
4. Topic 4 booklet questions