Explain how oxygen levels in a lake are affected by the amount of organic matter in a a lake?

Question

(b) rate of decomposition of organic matter

Answer 1

The more algae or organic matter there is in the lake the higher the levels of oxygen will be in that particular lake. Plant matter takes in "yucky stuff" and gives off oxygen just like we breath in oxygen and give off carbon dioxide. Hope that helps! :)

Answer 2

Oxygen is used up by the decomposition process of organic materials. The decomposition occurs via bacteria which consumes, rather than releases oxygen. Thus oxygen levels are decreased.

Answer 3

Contaminants such as organic chemicals and trace metals accumulate in anoxic (oxygen-deprived) bottom waters and sludge. These contaminants lead to water quality problems.

Dissolved organics, iron, and manganese cause brownish water color (staining) and contribute to undesirable taste and odor. Hydrogen sulfide creates foul taste and odor in raw water sources. It is also a major contributor to increased chlorine demand.

A lack of dissolved oxygen increases the release of phosphorus from sediments. Phosphorus is a nutrient that encourages algae growth. Algae and weeds are organic matter which cause oxygen depletion during biodegradation contributing to poor taste and odor. Water with little oxygen may also have a "flat" taste to it.

Answer 4

decomp releases acid, acidic water reduces total oxygen