Disposal Operations in 1997 in Million Metric Tonnes
This figure shows the total amounts of hazardous waste disposed of through 16 different methods in 1997 by parties to the Basel Convention on the Control of Transboundary Movements of Hazardous Wastes and Their Disposal. It shows the amounts based on export data and based on import data. List of D-codes (disposal methods) from the full report: 'D1, D2 and D4 (landfill, land treatment); D3 and D12 (underground storage); D5 (specially engineered la...
06 Mar 2006 - by UNEP/GRID-Arendal
Freshwater alkalinity: 1976-2008
Alkalinity is commonly used to indicate a water body’s capacity to buffer against acidity; that is, the ability to resist, or dampen, changes in pH. Thus, alkaline compounds in water, such as bicarbonates, carbonates, and hydroxides, lower the acidity of the water and increase the pH.
Alkalinity (as CaCO3) was analysed for all sampling stations available at the continental level. Concentrations remained reasonably steady between the two decades ...
26 Jan 2009 - by Philippe Rekacewicz (Le Monde diplomatique), February 2006
Biological oxygen demand - BOD: 1976-2008
The availability of oxygen is one of the most important indicators of the condition of a water body, because dissolved oxygen, or DO, (the amount of oxygen dissolved in water) is necessary for most aquatic organisms, including fish and invertebrates. Some species have very defined lower limits of DO that they can tolerate. Increases in DO can indicate improvements in water quality, such as has occurred in many parts of the world in the last 30 ye...
26 Jan 2009 - by Phillippe Rekacewicz, February 2006