Home >> Vital Water Graphics >> Regional trends in biochemical oxygen demand (BOD)
File type Download Size Language
.jpg .jpg Download 28 kb -
Uploaded on Saturday 25 Feb 2012 by GRID-Arendal

Regional trends in biochemical oxygen demand (BOD)

Year: 2005
From collection: Vital Water Graphics
Author: Philippe Rekacewicz, UNEP/GRID-Arendal
Biochemical oxygen demand is an indicator of the organic pollution of freshwater. Alkalinity (concentration of calcium carbonate or CaCO3) is another indicator of freshwater quality. These graphics compare the concentrations of these two factors, in milligrams per litre, in the major regions of the world for the periods 1976 to 1990 and 1991 to 2000. The accompanying text explains the implications of the changes in BOD and alkalinity during these time periods.
Views: 394     Downloads: 648     Rating: 3
Causes of sea level rise from climate change
Water consumption - top countries
Water withdrawal and consumption
Regulation of the Tigris and Euphrates rivers
Renewable freshwater supplies, per river basin
Benefits from marine and coastal ecosystems and activities
Phosphate levels in major basins