Name:ECOLOGY U4D7 Water Chemistry

BELLRINGER “Visit” to hospital, doctor’s office, or dentist.

TEACHER DEMO / NOTES / PPTOBJECTIVE: TSW summarize the human impact on ecosystems. CLE3255.4.4QUESTION: How do we measure chemical pollutants in water to determine ecosystem health?

1. Water report from KUB. Read the parameters. Which ones are negative / positive for public safety? Indicate negative contaminents with “--“ and positive with “+”.

2. Aquarium chemistry of beta tanks. What are 3 types of bacteria? What are 3 types of chemical pollutants?

3. How can we measure ions that contaminate water?Ions form complexes with dyes/chemical that changes the color we visually see. We call these chemicals indicators. Indicators are usually large organic molecules similar in some ways to hemoglobin molecule that carrys O2 in blood. When the heme group binds an oxygen molecule, the complex changes shape & thus color (a brighter shade of red). Hence, indicating it is in the presence of oxygen.

TSW…Identify 3 common pollutants of drinking water from KUB water report:

Identify 3 common pollutants in an aquatic ecosystem (aquarium / watershed):

Explain indicator:

GROUP WORK Analyze a water sample for common ions. Your group will run 4 tests to test for common ions that often pollute aquariums and watershed alike. Develop your procedures. Obtain teacher approval and then collect water sample and materials. We will share the test kit as a class, so only use one test at a time. Return all materials to bench when done.

Assign roles: sketch setup:Coordinator=Materials handler=Timekeep=Cleanup=

Procedure:1234567

Data table:Group pH ammonia nitrite nitrateHealthy ranges 6-7.6 0 0 40 Tap (control) 7.6 0 0 0

1 stream2 pond3 fish tank (new)

4 fish tank (old)

Summary:

Questions:

1 Why would pH effect water quality?

2 How are nitrates and nitrites different?

3 What are sources of ammonia?

3 Explain how high levels of nitrates cause eutrophication.

4 How can you lower nitrate levels in a fish tank?

5 Explain why an healthy ecosystem (aquarium / watershed) requires certain population of bacteria.

EXIT QUIZ – What are associated risks/dangers/characteristics of common pollutants on aquatic health?