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Purpose:
To provide the students with a better understanding of what toxicity, what toxicology is, and what a toxic substance is. Students also learn about threshold levels and lifetime ingestion rates.
Summary:
These tasks will be accomplished by first reading about toxicity, then doing the activity sheet in which each student calculates their own lifelong ingestion of toothpaste and then doing an experiment in which the student determines his/her threshold for a certain type of toothpaste.
Objectives Links:
A. Environmental problems
Process Skills Checklist
Materials:
Materials for this laboratory exercise are setup for lab groups consisting of three to four students.
For the class:
1 tube of Tartar Control Crest
Setup for one lab group:
- student reading sheets
- student worksheets
- calculators
- metric ruler
- Q-tips, 4 per student
- five 8oz. plastic cups
- tap water
- 2" x 4" sheet of waxed paper
- felt tip marker
- plastic spoon
- pencil
- clean 50mL graduated cylinder
Safety Concerns:
The teacher should review the following with all students taking part in this laboratory exercise.
- Student should not taste any materials in the lab without permission from the teacher.
- Students should wash their hands thoroughly before and after this activity.
- Students should make sure lab glassware, especially the graduated cylinder, is clean before using.
- Remind students that they should perform only the procedures described in the student directions and only under the supervision of the teacher.
Revision Date:
Summer 2001
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