In what chemical forms might the elements carbon, sulphur, nitrogen and iron be found in the hypolimnion?

Question

In what chemical forms might the elements carbon, sulphur, nitrogen and iron be found in the hypolimnion?

Answer 1

Lithotrophic organisms will be found in the hypolimnion - oxygen scarce environment. So you will find:

Methane - CH4

Carbon Monoxide - CO

Formic (Methanoic) acid - CO2H2

Sulphate - SO4

Hydrogen Sulphide - H2S

Ferrous iron - Fe(II) & Fe(III)

Ammonia - NH4

Nitrogen - N2

Nitrogen Dioxide - NO2

Nitrate - NO3