nitrogen from animal waste can be stored in bodies of water as... what?

Answer 1

Nitrogen from animal waste can enter bodies of water primarily in the form of nitrates (NO3^-) and ammonia (NH3). When animal waste decomposes, it releases ammonia, which can be converted by bacteria into nitrites (NO2^-) and then into nitrates through a process called nitrification. Nitrates are water-soluble and are the most stable and prevalent form of nitrogen stored in bodies of water.

In aquatic ecosystems, nitrates are essential nutrients for plant and algal growth. However, excessive amounts of nitrates from agricultural runoff, animal feedlots, or other sources can lead to eutrophication—a process where the increased nutrient load promotes excessive growth of algae and aquatic plants. This can deplete the oxygen in the water as algae and plants die and decompose, leading to dead zones where aquatic life cannot survive.

In some conditions, bacteria in the water can also convert nitrates into nitrogen gas (N2) through a process called denitrification, returning it to the atmosphere. However, the amount of nitrogen that undergoes this process is generally much smaller than the amount that remains in the aquatic system as nitrates.

Answer 2

but which one is it mostly stored as?

Answer 3

In bodies of water, nitrogen from animal waste is primarily stored as nitrates (NO3^-). Nitrates are the end product of the nitrification process, where bacteria in the environment convert ammonia (NH3) from animal waste first into nitrites (NO2^-) and then into nitrates. Since nitrates are highly soluble in water and do not easily volatilize or adhere to soil particles, they tend to remain dissolved in water and are the dominant form of nitrogen in aquatic systems.

High levels of nitrates in water bodies can lead to issues like eutrophication, as previously explained. Due to their stability and solubility, nitrates are also the form of nitrogen that is most often measured to assess the level of nutrient pollution in water.