ENVS 1000U Lecture Notes - Sodium Laureth Sulfate, Median Lethal Dose, Ingredients Of Cosmetics

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Published on 22 Apr 2013
School
UOIT
Department
Environmental-Science
Course
ENVS 1000U
Professor
ENVS 1000 Environmental Science - Winter 2013 - Assignment # 6
This Assignment is worth 5% of your final mark in ENVS 1000
Assignment # 6 is due by Thursday April 11, 2013 (by 5 p.m.)
through the Blackboard Assignment Box.
NAME: ____________________________ STUDENT #: _____________
INTERPRETING TOXICITY INFORMATION
As you complete this Assignment, answer the following questions IN YOUR OWN WORDS. Keep
answers brief and concise. (Note: You do not need to use all of the space provided for each question)
Use the resources provided in this Assignment, the posted slides for Lecture 21 on Environmental Health
hazards; also refer to your Textbook (Chapter 19 in Withgott et al. (2013)).
1. Review the posted Powerpoint slides for Lecture 19 and Chapter 19 (pages 614-615) in your Textbook.
(a) distinguish between LD50 and ED50 (in your own words):
- LD50
Toxic amount required to kill 50% of organism that are being tested/ population
- ED50
Toxic amount required to affect 50% of organisms that are being tested/ population
(c) give one advantage for using animals as test organisms (instead of human subjects)
-Can test a multitude of things without killing/affecting humans
(d) give one disadvantage for using animals as test organisms (instead of human subjects)
- Animal research testing is objected by some people and may not always give the results that can
be seen in humans
2. Go to the website - http://www.business.u-net.com/~freya/risk/ld_frame.html and answer the following
questions:
(a) using the Oral LD50 values, rank the 6 „comparison chemicals‟ (shown in bold print) from the most toxic
to the least toxic:
Kerosene, Nicotine, Gasoline, Caffeine, Aspirin, Table Salt,
(b) from the Oral LD50 values, which herbicide (normal non-bold print) is most toxic? Paraquat
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Document Summary

This assignment is worth 5% of your final mark in envs 1000. Assignment # 6 is due by thursday april 11, 2013 (by 5 p. m. ) through the blackboard assignment box. As you complete this assignment, answer the following questions in your own words. Keep answers brief and concise. (note: you do not need to use all of the space provided for each question) Toxic amount required to kill 50% of organism that are being tested/ population. Toxic amount required to affect 50% of organisms that are being tested/ population (c) give one advantage for using animals as test organisms (instead of human subjects) Can test a multitude of things without killing/affecting humans (d) give one disadvantage for using animals as test organisms (instead of human subjects) Foasmine ammonium (d) assuming that humans react in the same way as the small mammals (mice) tested for the from the ld50.

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