Presentation on theme: "pH TURBIDITY Water Quality Factors TEMPERATURE DISSOLVED OXYGEN (DO)"— Presentation transcript:
1 pH TURBIDITY Water Quality Factors TEMPERATURE DISSOLVED OXYGEN (DO) PHOSPHATESBIO-INDICATORSpHNITROGEN
2 TEMPERATURE EFFECTS: changes rate of photosynthesis changes rate of respirationchanges DO in watercold water holds more DOhot water holds less DOchanges sensitivity of organisms to toxicwaste, parasites, disease.
3 TEMPERATURE Thermal pollution = adding warm water to cold water. CAUSES OF THERMAL POLLUTION:Industry (nuclear power plants, paper mills)Urban Development (storm water runoff, construction, soil erosion)
4 DISSOLVED OXYGEN (DO) ORANGE = Oxygen MICKEY MOUSE = Water Less Oxygen =Less fishFish needOxygen
5 DISSOLVED OXYGEN (DO) TO INCREASE DO: Much of DO comes from atmosphere Some of DO comes from photosynthesisTO DECREASE DO:Add pollutionAdd organic waste
6 ORGANIC WASTE = LOW DO Organic waste = parts of once living things EXAMPLES OF ORGANIC WASTE:SewageFarm runoffDischarge from food processing plants
7 HOW RAW SEWAGE LOWERS DO RAW SEWAGE GOES INTO WATER:Decomposers chow downDecomposers take up oxygenDecomposers reproduce, taking up more oxygenNo more oxygen for other animalsNothing left but decomposer & sewage-filled water.
11 pH pH = measure of concentration of hydrogen ions in a substance Tells whether substance is:ACIDBASENEUTRAL
12 pH Measured on scale from 0 to 14 0 = highly acidic (HCl) 7 = neutral (pure water)14 = highly basic (bleach)Seawater pH ranges from 7.5 – 8.5Average pH of ocean water = 7.8pH of natural water = 6.5 – 8.5Optimal range for life = 6.5 – 8.2
13 pHUS Northeastern rain pH = 4.3Rain elsewhere in US pH = 5.0 – 5.6
16 pH SOURCES OF LOW pH IN WATER: Acid rain is cause of acid in thousands of lakesBurning fossil fuels has increased acid rainEFFECTS OF LOW pH IN WATER:Low pH directly kills fishpH < 5, most fish eggs die
17 NITROGEN Living organisms need nitrogen to make proteins Nitrates (NO3) & Nitrites (NO2) are compounds made of nitrogen & oxygenSome nitrogen in water is goodThe wrong amount is bad
18 NITROGEN SOURCES OF NITROGEN IN WATER: Human & animal waste fertilizer EFFECTS OF TOO MUCH NITROGEN:Lowers dissolved oxygen (DO).
19 NITROGEN – EUTROPHICATION Q: How does Nitrogen reduce the amount of DO?A: EutrophicationNitrogen feeds algae (green stuff)Algae grows & growsAlgae blocks sunlightUnderwater plants dieAlgae die and decomposeThe decomposition takes up oxygenNo DO for organisms, so they die
32 TURBIDITY SOURCES: Human dumping Construction Soil erosion Nitrate pollutionPhosphate pollutionHUMAN DUMPING:ClaySiltIndustrial wasteRaw sewage
33 TURBIDITY EFFECTS: Clogs fish gills Smothers eggs Makes water unlivable
34 BIO-INDICATORSBio-indicators = organisms that help determine health of water.Presence or absence tells something about the water.Not always an accurate way to measure water quality.Accurate in telling environmental stress
35 BIO-INDICATORS HOW HUMANS AFFECT BIO-INDICATORS: Over-fishing Industrial pollutionPoor farming practicesAdding foreign species