Dissolved Oxygen in Water Lab

Transcription

1 LaMotte Lesson Plan Classroom Series Dissolved Oxygen in Water Lab Code 5963 Grades 5, 6, 7, 8 Lesson Plans are provided to help organize an existing curriculum, allowing the teacher to spend more time on hands-on activities that meet key classroom learning objectives and improve student achievement. The Lesson Plans will aid the teacher in integrating LaMotte test kits and equipment into classroom activities that meet National Science Education Standards. LaMotte Company PO Box 329 Chestertown MD

2 Concept/Topic: Introduction to dissolved oxygen and demonstration of a simple test procedure. Time Requirement: One class/lab period General Goals: The students will gain a basic understanding of dissolved oxygen in water. Specific Objectives: 1 Students will be able to explain the importance of dissolved oxygen in aquatic ecosystems and industrial processes. 2 Students will be able to explain the aquatic oxygen cycle. 3 Students will be able describe the effect of water pollution on oxygen levels. 4 Students will be able to follow instructions and work together as a team. 5 Students will be able to make observations. 6 Students will be able to collect and analyze data, and draw a conclusion. Materials, Required: Order Code Description 5963 Classroom Studies, Dissolved Oxygen in Water Lab Safety Goggles Gloves Timer/clock Water sample (tap, aquarium etc)

3 Materials, Optional Order Code Description 5418 Pondwater Tour 5419 Watershed Tour 5849 AM-12 The TesTab Water Investigation Kit 5860 Dissolved Oxygen Test Kit Dissolved Oxygen Science Project Kit Anticipatory Set (Lead-In): Almost all types of water have some oxygen dissolved in them. Dissolved oxygen is so important to the health of fish that aquarium owners and fish farmers often use mechanical methods to add oxygen to the water. Aquatic plants, including algae, increase dissolved oxygen levels in water. During photosynthesis, plants use carbon dioxide from the water and energy from the sunlight to produce oxygen. Dissolved oxygen levels change according to the time of day, the temperature and the weather. Fish, like trout, may seek cold, deep pockets of oxygenated water. Salinity and altitude also limit the amount of oxygen that can be dissolved in water. Once in the water system, oxygen is used by the aquatic life. Oxygen is also consumed when organic material such as human or animal waste, improperly treated wastewater or plant debris decomposes in water. Some aquatic systems may undergo such a large amount of decay of plant and animal material that no oxygen remains for the living organisms. High levels of oxygen are not desirable in water used in industry. Even tiny amounts of dissolved oxygen contribute to corrosion in boilers and hot water heating systems. Preparation: Read the manual to become familiar with the text and test procedures. Cut apart foil strips of tablets as shown in the manual. Prepare and package a set of items for each of the 5 teams. Decide how to divide the students into 5 teams. Make a copy of the Student Procedures for each team.

4 Step-By-Step Procedures: 1. Divide students into 5 groups. 2. Present the Introduction lecture material. 3. Pass out a set of bagged items to each team. 4. Have members of each team decide on duties of each member. For example, instruction reader, reagent adder, mixer, timekeeper, result recorder etc. 5. Read instructions aloud for How To Take Water Samples, one step at time, as students collect a water sample. 6. Immediately, read instructions aloud and have students follow instructions for Testing for Dissolved Oxygen. 7. Discuss students' results. Plan for Independent Practice: Have students review additional information on dissolved oxygen on websites included in the Resources section. Have students read and become familiar with Student Procedures. Closure (Reflect Anticipatory Set): In natural water, a high dissolved oxygen level is a sign of a healthy ecosystem. Low dissolved oxygen levels are often a sign of pollution. The amount of oxygen required varies according to species and stage of life. Fish and other animals that can move will leave areas with low dissolved oxygen and go to areas with higher levels. Those that cannot move or are trapped may die if oxygen levels become too low.

5 Assessment Based on Objectives: Have students: list factors that influence dissolved oxygen levels in water. describe the aquatic oxygen cycle. explain why dissolved oxygen is harmful to some industrial processes. Adaptations (For Students With Learning Disabilities): Provide written and verbal instructions for test procedures. Provide a copy of lecture material. Give students a copy of the Student Procedures ahead of time so they may become familiar with the instructions. Extensions (For Gifted Students): Have students draw a diagram of photosynthesis in aquatic plants. Have students follow suggestions in the manual for Additional Experiments. Have students use terms in the Glossary to create a dissolved oxygen crossword puzzle. Possible Connections To Other Subjects: Social studies land use and urbanization Social studies Resources Literature Methods Equipment Kids in the Creek KR/ed/kidsinthecreek topics/waterquality/do.htm More information on water quality and testing National Science Foundation Just for Kids Standard Methods for the Examination of Water and Waste Water Details of test methodology LaMotte Company Review and order additional equipment

6 National Science Content Standards Addressed A B D E F Science as Inquiry All students should develop: Abilities necessary to do scientific inquiry Understanding about scientific inquiry Physical Science All students should develop understanding of: Transfer of energy Life Science All students should develop understanding of: Structure and function in living systems Regulation and behavior Population and ecosystems Diversity and adaptations in organisms Science and Technology All students should develop: Abilities of technological design Science in Personal and Social Perspectives Natural hazards Resources National Resource Council (NRC) National Science Education Standards. Washington, D.C.: National Academy Press. LaMotte Company LP