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York University (33,539)
ENVB 2050 (60)
Lecture 4

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York University
Environmental Biology
ENVB 2050
David Stamos

Lecture 4 Prof briefly discusses microbe and drinking waterVirus are so tiny they can get around water filtration systems and cause diarrheaOnly Hepatitis A causes a different reaction from most viruses eg liver inflammationParasites are in the water where sewage and animal waste are connected to drinking water and can cause diarrhea vomiting Radionuclide these are possible to find in waterAlpha emittersBetaphoton emittersCombined Radium 226228Radon gas more common in indoor air than in water o If it is detected in the indoor air it is guaranteed to be in the indoor water o Radon comes from soil eg house built on soil with uranium During the breakdown of uranium radon is yielded and enters the house through indoor air through holesDamage to DNA and our genetic material increase risk of getting cancer Inorganic ContaminantsArsenic can be found in the natural environment or in industrial environment Can be consumed over a long period and cause skin damage skin discoloration affect circulatory systemFluoride added to drinking water to prevent dental damage In small concentrations fluorides dont harm the body In excessive concentration it may cause bone diseasesLead can be found in drinking water and are usually because of leaded pipes However it has been banned for 30 years Chemical Hazards in Human HealthTo distinguish between natural and manmade chemicals o Many c
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