how is it relate to water qualit
this incedent was common with fish kills and large segments of slow-moving rivers and lakes becoming almost because of high BOD caused by pollution. The samples are placed in bottles full to the brim and sealed off by a lid. The sample bottles are covered completely with aluminum foil and placed in a dark place. This limits the photosynthesis, which could happen with captured algae. After five days, the bottles are unlocked and the dissolved oxygen is probed. The difference between the first and the last of the samples is called the BOD.