Objectives |
| 1. The student will be able to describe turbidity.
2. Student will understand how turbidity can affect water quality.
3. The student will make their own turbidy tubes and use them to take turbidity readings from the Red Lake River.
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ND Standards Addressed |
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MN Standards Addressed |
| SC Earth and Space Science |
MB Standards Addressed |
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Time Requirement |
| 2 Hours |
Procedure/Outline |
| Materials Needed:
8 ft. fluorescent light sleeves, cut into three pieces
PVC pipe cover
Sharp knife to cut sleeves
sealant
permanent markers
rulers or yard sticks
stick pins
Procedures:
1. Lead discussion about turbidity. Talk about what turbidity it. Show the students two samples of water, one that looks "dirty" and one that appears clear. Discuss which appears to have more or less turbidity.
2. Show the students an actual turbidity tube, and demonstrate its use.
-Be sure to include the procedure to correctly read the tube
-Have a student demonstrate reading the "dirty" water and the clear water
3. Hand out a tube, ruler, marker, and PVC cover to each group.
4. The students should draw the secchi disk shape on the inside PVC cover.
5. Have the students measure from the bottom of the tube up 2.875 inches and mark it 200 NTUs. Follow the rest of the measurements and marks.
4.5 inches = 100 NTU
7.5 inches = 50 NTU
12.25 inches = 20 NTU
17 inches = 15 NTU
20.75 inches = 10 NTU
6. Put PVC cover on the bottom of the tube.
7. Put a hole in the bottom of the tube with the stick pin.
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Modifications/Adatption/Extensions |
| Possibly help students to do measurements |
Assessments |
| Get a sample of River water and have the students check the turbidity. Go around and check the students readings. |
Other Comments |
| It would be good to seal the tubes so that the water does not leak out the PVC cover |
