PCBs in the Last Frontier

By Michael Tessmer

Abstract

This interrupted case study is based on current research involving the global transport of polychlorinated biphenyls (PCBs). Students are asked to propose several hypotheses and experiments in an attempt to determine how PCBs are transferred globally. As the case unfolds, it becomes clear that the transport mechanism is more complicated than scientists first thought. The case requires minimal background knowledge and is suitable for major and non-major courses in biology, chemistry, and environmental science.

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Date Posted

06/16/2005

Overview

Objectives

Help students review the scientific method.
Teach students how to better state hypotheses.
Encourage students to design experiments that test a hypothesis.
Introduce students to the scientific literature with a relatively easy-to-read article.

Keywords

Experimental design; PCB; polychlorinated biphenyl; bioaccumulation; persistent pollutants; sockeye salmon; Alaska

Subject Headings

Analytical Chemistry

Atmospheric Science

Biology (General)

Chemistry (General)

Earth Science

Environmental Science

EDUCATIONAL LEVEL

High school, Undergraduate lower division

FORMAT

PDF

TOPICAL AREAS

Scientific method

LANGUAGE

English

TYPE/METHODS

Interrupted; Journal Article

Teaching Notes & Answer Key

Teaching Notes

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Answer Key

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