Permission slip? Please get out objectives #21-23 for a stamp Please read the board! Woot!

pathogens oxygen demanding wastes organic and inorganic chemicals sediment Plant nutrients Heat /thermal pollution Types & Sources of Water Pollution Types & Sources of Water Pollution © Brooks/Cole Publishing Company / ITP

What do these have in common? oxygen demanding wastes sediment Plant nutrients  Heat /thermal pollution  They reduce the amount of oxygen available in the water!

Dissolved oxygen (DO)  Aquatic organisms need it to do cellular respiration  C 6 H 12 O 6 + O 2  ATP + CO 2 + H 2 0

How does DO get into water?  Photosynthesis  Physical churning  diffusion

Testing for Dissolved Oxygen

LAB TOMORROW! Where is there better water quality – upstream on Buffalo Bayou or downstream? DO Temperature Turbidity pH Phosphates Nitrates

What lowers DO? oxygen demanding wastes (leaves, sewage, manure decompose in water. Decomposers use up the DO)

What lowers DO?  Sediment (soil blocks sunlight – plants can’t do photosynthesis)

What lowers DO?  Heat /thermal pollution  Warm water holds less oxygen

What lowers DO?  Plant nutrients (eutrophication)

BRAINSTORM GAME – 1MINUTE

Eutrophication Obj #27  Each pair/tri needs a white board, 2 markers, and an eraser – send a runner now!  Page 137 Read the paragraph on artificial eutrophication.  List the steps of eutrophication on obj #27.  Compare your list with your neighbors  Use your notes to draw a cartoon of the process on the white boards.

Plant nutrients (nitrogen and phosphorus) cause eutrophication

Other sources of plant nutrients  Untreated sewage  Manure from livestock  Pet wastes  Leaking septic systems

 Carry water from streets to local bayou/water way  ONLY WATER should go down these!  NO: ◦ Litter ◦ Leaves ◦ Pet poop ◦ Oil/paint Storm drains

What’s the difference between storm drains and the drains in your home?

Hypoxic zones “Dead zones” – form in the summer Gulf of Mexico

Eutrophication  Which pollutants are involved?  What are the sources of these pollutants?  Are these sources point or nonpoint sources?  What are the effects of eutrophication?  Why does the dead zone form in the Gulf near New Orleans?  Why does the dead zone form in the summer?