Oregon Public Records Law for Retention and Disposition What it Really Means.
PH. Each change in pH really means… Water pH Lab.
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Transcript of PH. Each change in pH really means… Water pH Lab.
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pH
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pH
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pH
• Each change in pH really means…
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Water pH Lab
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Look at your graph…
• What does it show you?
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Seawater has a BUFFER!
• What is it?
• What causes it?
• How is seawater different from fresh water?
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pH Buffer System
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• If acid is added (sewage output/volcanic activity)
• If alkaline solution is added
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Photosynthesis?? Respiration??
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Ocean Acidification
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Ocean Acidification Lab & Case Study
• http://dataintheclassroom.noaa.gov/SitePages/oa/simulation#
• Bring a water sample tomorrow!
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Videos!
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Dissolved Oxygen (DO)
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Seasonal DO variation –what could cause this variation?
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Profile Graph
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COMPARING WATER SAMPLES LAB
How can we measure….
Salinity
DO
pH
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CASE STUDY—THE DEAD ZONE
Marine Issues--Homework
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NOAA Dead Zone Video4 min
•Eutrophication—
•Hypoxia—
•Dead Zone—
• Online Map Activity
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• What waterways connect to the Gulf?
• What smaller waterways connect to those?
• What natural processes could be contributing to water quality degradation and the development of the Gulf dead zone?
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Make a Hypothesis
• What anthropogenic activities or materials could be contributing to water quality degradation and the development of the Gulf dead zone?
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http://www.nationalatlas.gov/mapmaker?saved=T&left=-5954010.16308408&right=4024783.32376774&top=4336078.07187835&bottom=-2650901.64560656&mWidth=547&mHeight=383&visLayers=states%2Cusurban%2Cgrid%2Clakesrive
• http://
mapmaker.education.nationalgeographic.com/?ar_a=1&b=1&ls=000000000000#/
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• What anthropogenic activities or materials could be contributing to water quality degradation and the development of the Gulf dead zone?
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Turbidity
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Measuring turbidity
Taking a Secchi Disk Reading Using a Turbidity Sensor
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Turbidity
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• 1. average salinity of seawater_____• 2. average pH of seawater________• 3. range of pH in seawater___ to ___• 4. instrument to test seawater salinity______• 5. type of bond between water molecules____• 6. type of molecule water is:___________• 7. area in the ocean with drastic change in
salinity___________• 8. area in the ocean with drastic change in • density____________• 9. What type of graphs do we use to show changes as
you go down in the ocean?_______• 10. What units do we use for salinity?_____
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Magic numbers!!!!!!!!
Salinity –avg 35 ppt
DO –avg 5 – 6 ppm
(2ppm hypoxic; 0ppm anoxic)
pH –avg 8 (7.5 – 8.4)
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CELEBRATION OF KNOWLEDGE TOMORROW!!!
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Thanks to the following websites for photos and information:
http://mddnr.chesapeakebay.net/eyesonthebay/whatsitmean.cfm
http://www.bigelow.org/virtual/heat_cap.jpg
http://schc.sc.edu/mare/estuaries.htm
http://waterontheweb.org/under/waterquality/turbidity.html
http://www.indiana.edu/%7Eg131/chem6.gif
http://www.whoi.edu/OCB-OA/page.do?pid=112076