Friday, April 16, 2010

Unit Review


Mercury

Mercury is released into the environment through the burning of fossil fuels. Coal is responsible for 87 percent of mercury emissions through oxy-coal combustion. One way factories try to reduce their coal emission is through cleaning the coal.

When inhaled mercury can cause problems in the mouth, lungs and respiratory system. It is said that it's likely to cause cancer in humans. For females the mercury can be harmful for their babies through the breast milk. This would lead to neurological problems.

Boimagnification in the increase in concentration of a substance up the food chain. In result eating larger fish is a greater health risk than eating smaller non predatory fish. The toxic chemicals bioaccumulatre and work their way through a food web.


Water Quality Index:

Chlorine- water additive _>eye/nose irritation, stomach discomfort
Iron- natural sources, corrosion of pipes -> discolored, gross taste
Copper- corrosion of household plumbing systems -> liver or kidney damage
Sulfied- sewage -> salty taste
Silica- sand
pH- corrosion and deposits -> bitter metallic taste
Phosphate- fertilizers, soap/detergents -> interfer with digestion
Nitrate- sewage, fertilizers ->blue baby syndrom, infant death, shortness of breath
Chromium- discharges through steel mills -> allergic dermatis
Ammonia nitrogen- agriculture run-offs, fertilizers -> suffocatoin of babies, blueish skin
Fecal coliform -> bacteria, indicator of other pollutants -> stomach discomfort

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