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Published byAriel Andrews Modified over 8 years ago
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Water Quality Natural & Controlled Environments
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Monitoring natural environments Photo courtesy of Melissa Gutierrez
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So who monitors our natural waters? Environmental Protection Agency- –Mission- protect human health, safeguard environment Clean Water Act (1972)- law regulating discharges of pollutants into the waters of the United States and regulating quality standards for surface waters
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Nitrates (NO 3 ) & phosphates (PO 4 ) Run-off from commercial fertilizers and animal waste to near-by storm drains and creeks Scale from 0 – 1 ppm Can increase algal blooms and aquatic plants hypoxia (low oxygen)
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Dissolved oxygen necessary for most life hypoxia lowers tolerance to stressors (pathogens, pollution, etc.) death enters water as a product of photosynthetic organisms & by water/air interactions Aquarium O 2 = 7-9
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Air temperature Varies Affects water temperature Which water would you rather jump in to?
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Water temperature Varies Changes less rapidly than air temperature Cold water holds more DO
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pH Range from 0-14 measuring acidity ( 7) of substance pH of Water = 7.0
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Turbidity Secchi disk- Measures transparency of fresh or saltwater
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Fecal coliform bacteria Coliform bacteria (E. coli) found in feces & intestinal tract of warm-blooded animals Its presence may indicate presence of other harmful pathogens Animal waste washes into bodies of water after heavy rains
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The Dead Zone
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Hypoxia and anthropogenically increased nitrogen and phosphorus input
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World Wide Effects of Eutrophication
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Monitoring controlled environments
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