announcements closed toe shoes or booties for this lab!! llela field data return labs and dust bowl...
TRANSCRIPT
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AnnouncementsClosed toe shoes or booties for this lab!!LLELA field data Return Labs and dust bowl papersMini Paper on Dead Zone Due next week Oct 21
Question #3 on Page #71 Next Week Movie and LLELA reviewNext Quiz October 28th
Land Use & Resource Management, Soil, Water Quality, WWTP Trip, Estrogen Effect movie (Assault on the Male)
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Water Quality and Pollution
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Land 25%
Water 75%
Ocean97.3%
Fresh Water2.5%
Water Distribution
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Lakes52%Soil Moisture
38%
Water vapor-Atmosphere8%
Rivers1%
Living Organisms1%
Glaciers and Ice caps79%
Aquifers20%
Surface
1%
Water distribution cont’d..
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Fig: Hydrologic Cycle
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Uneven distribution of water across EarthPopulation densityRenewabilitySustainabilityWater scarcityWater quantity and qualityCommunicable diseasesEutrophication
Water Issues and Challenges
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Types of water pollution
Point Sources:•Pollution come from single location, eg: municipal WWTP discharge, pipe, ditch, factory•Easy to identify.
Non-point Sources:•Pollution come from multiple sites over large areas, eg: pesticides, fertilizer runoff from farms, oil from city streets, forest runoff etc.•Difficult to identify.
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Eutrophication:
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Water Quality AnalysisSafe Drinking Water Act, 1974EPA sets standards for 90 contaminants
Water Quality StandardsPrimary standards: legally enforceable and aim to
protect public health by limiting the level of the contaminant in drinking water.
Secondary standards: are NOT legally enforceable.
Maximum Contaminant Level (MCL): The highest level of a contaminant that is allowed in
drinking water Maximum Contaminant Level Goal(MCLG):
The level of contaminant in drinking water below which there is no known or expected health risk
Important!!!
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Physico-chemical Parameters
Turbidity: cloudiness (NTU=Nepholometric Turbidity Unit)Nitrates: fertilizer, runoff, death to infant, 10mg/LIron: toxic to humans, 0.3mg/LPhosphorous: not currently regulated by EPA, fertilizer, sewageCopper: gastrointestinal problem, 1.3mg/LAmmonia: not currently regulated by EPA; toxic to aquatic organisms, 0.02mg/LSilica: not currently regulated by EPA, rocks, diatom cellsSulfide: not currently regulated by EPA, coal, oil, acidChlorine: disinfectant, irritations, stomach discomfort,4 mg/LCynide: steel, metal, plastic, fertilizer factories, nerve and
thyroid, 0.2mg/LChromium: steel, pulp mills, allergic dermatitis, 0.1mg/LpH: natural water 6-8
Table 1: Summary of Basic Water Quality Parameters (+/-)
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Treatment Temperature (0C)
Dissolved Oxygen (mg/L)
Heated Pond water
Room Temperature Pond Water
Cold Pond Water
Heated Pond Water with Fertilizer
Room Temperature Pond Water with Fertilizer
Cold Pond Water with Fertilizer
Table 2: Summary Results for Dissolved Oxygen Levels (mg/L)
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SAFETY
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HypothesisH1: The aquarium with cold water and no
fertilizer will have a different level of dissolved oxygen compared to the other treatments.
H0: The aquarium with cold water and no fertilizer will NOT have a different level of dissolved oxygen compared to the other treatments.