Chemical Oxygen Demand (COD) determine the amount of organic pollutant that are found in the surface such as lakes, rivers and estuaries, which makes COD a useful water Quality parameter. COD also is used as a measure of oxygen requirement in water bodies that are susceptible to oxidation by strong chemical oxidant such as potassium dichromate and concentrated sulfuric acid. Based on Trivedi and Raj (1992), COD values are not affected by the presence of toxins and other unfavourable conditions for microorganism's growth. Waite (1984) stated that the value for COD is higher than the BOD value for the same sample. An advantage of COD analysis is that COD analysis can be run rapidly in 2 hours time, while a Bod analysis take five days to complete (Waite,1984)
Link Chemical Oxygen Demand
Wednesday, July 2, 2008
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