announcements
DESCRIPTION
Announcements. Closed toe shoes or booties for this lab !! LLELA field data Return Labs and dust bowl papers Mini Paper on Dead Zone Due next week Oct 21 Question #3 on Page #71 Next Week Movie and LLELA review Next Quiz October 28 th - PowerPoint PPT PresentationTRANSCRIPT
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)
Water Quality and Pollution
Land 25%
Water 75%
Ocean97.3%
Fresh Water2.5%
Water Distribution
Lakes52%Soil Moisture
38%
Water vapor-Atmosphere8%
Rivers1%
Living Organisms1%
Glaciers and Ice caps79%
Aquifers20%
Surface
1%
Water distribution cont’d..
Fig: Hydrologic Cycle
Uneven distribution of water across EarthPopulation densityRenewabilitySustainabilityWater scarcityWater quantity and qualityCommunicable diseasesEutrophication
Water Issues and Challenges
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.
Eutrophication:
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!!!
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 (+/-)
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)
SAFETY
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.