Sunday, February 24, 13. Heavy Metal Toxicity
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- Jack Freeman
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1 Heavy Metal Toxicity
2 Defining Water Pollution Water pollution: degradation of water quality Water Quality Depends On: 1. Use- what will the water be used for? 2. Difference from normhow different is the water now from how it is normally? 3. Health/Ecosystem Effects- what will happen if humans or animals drink/swim/use this water? Polluted water in India where clean water is a big environmental problem
3 Water Uses Agriculture Industrial Processes Power Generation Home Use (Domestic)
4 Direct Sources Runoff Leaks Sources of Pollutants to Water Seepage into groundwater Air transport Indirect Sources Population size- leads to more pollution overall
5 Categories of Pollutants
6 Water Requirements for Home Use Water must be free from: Fine sediment Insecticides Pesticides Pathogens Heavy metals Should also taste good, be odorless, not damage plumbing
7 Heavy Metals in the Environment Heavy metals: high atomic weight Examples: Mercury, lead, copper, arsenic, cadmium, gold Can pollute both water and soil Both naturally occurring and human released Sources Human Released: Industrial sources (mining), runoff Naturally Occurring: rocks and minerals
8 Effects Of Metals on Health Direct Effects Physiological- metals can inhibit basic body functions Indirect Effects stored in tissues over time- initial dose might be ok, but can accumulate over time (bioaccumulation) Example: Mercury mad hatter - mercury used in hat making
9 Health Effects from Toxic Metals: Minamata, Japan Chisso Corporation released methyl mercury into Minamata Bay from Methyl mercury bioaccumulated in shellfish and fish which were eaten by the residents 2,265 victims were reported and 1,784 of them had died Mercury poisoning: muscle weakness, damage to hearing/speech, coma, death
10 Heavy Metal Uptake Pathways WATER Humans Consumers Humans Consumers LAND Phytoplankton Plants Water Metals Metals Soil
11 Example: Lead (Pb) Contamination
12 Example: Lead (Pb) Contamination Soils in Mt. Pleasant, Michigan were found to be significantly contaminated with lead (4x EPA standards). The highest concentrations were found near homes built before Why?
13 Example: Lead (Pb) Contamination Soils in Mt. Pleasant, Michigan were found to be significantly contaminated with lead (4x EPA standards). The highest concentrations were found near homes built before Why? Leaded paint and gasoline- used
14 Example: Lead (Pb) Contamination Soils in Mt. Pleasant, Michigan were found to be significantly contaminated with lead (4x EPA standards). The highest concentrations were found near homes built before Why? Leaded paint and gasoline- used heavily in the past Seep into groundwater
15 Example: Lead (Pb) Contamination Soils in Mt. Pleasant, Michigan were found to be significantly contaminated with lead (4x EPA standards). The highest concentrations were found near homes built before Why? Leaded paint and gasoline- used heavily in the past Seep into groundwater
16 Example: Copper in San Diego Bay Copper levels in San Diego bay are much higher than in neighboring Mission Bay. Why? San Diego Bay Mission Bay
17 Sources of Copper to San Diego Bay Anti-fouling paint on boat hulls Run-off- brake pads, storm water
18 The Effects of Copper in San Diego Bay Damaging to plant and fish life Fish, mussels, kelp Shelter Island Yacht Basin Ultimately un-healthy for humans Lots of recreational activities in the bay- such as fishing meso.spawar.navy.mil
19 Studying the Effects of Anti-fouling paint on Cu concentrations in San Diego Bay Regulations prevent excess copper from being introduced into the bay Including from anti-fouling paint Tests are being done to determine why so much copper is entering the bay Type of paint Boat cleaning methods
20 SPAWAR Results
21 Conclusions Water pollution is any degradation of water quality from it s original state This can vary depending on the intended use of the waterdrinking, home, industrial, etc Heavy metals are particularly harmful pollutants to water quality Dangerous to human health Toxic to marine life Heavy metal contamination in water has declined recently, but some metals such as copper still remain high
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