pollutants

Pollutants


Contents of Entire Course

Persistant Pollutants
Water Pollution and How it Occurs
Flow of Pollutants
Selected Water Pollutants

adapted to HTML from lecture notes of Prof. Stephen A. Nelson Tulane University

 


Persistant Pollutants
Accumulates in our bodies over long periods of time. The US EPA, has set maximum standards, or limits, for many of these.

Lead -- Less than .05 ppm in water.
Arsenic -- Less than .05 ppm in water.
Mercury -- Less than .002 ppm in water.
Nitrates -- Less than 10 ppm in water.

Main sources are fertilizers and sewage.
Inhibits blood ability to carry oxygen.
Can not boil water to remove, like you can with bacteria and virii -- boiling only concentrates nitrates, making them more toxic.  

Epidimiology - Study of disease rates and what causes them. Often provide a very valuable source of information on how deaths are related to other factors.
 

Area  Cardiovascular 
Disease
Other Causes      Total 
Hard Water 
Counties
  642   556   1198 
Soft Water 
Counties
  1255   216   1971 
eutrophication.gif
Hazardous Chemicals (Toxic organic and Inorganic compounds). Heavy Metals -- Lead, Mercury, Zinc, Cadmium
Radioactive Chemicals Thermal Pollution