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Nitrogen In Groundwater from Ground-Water Microbiology and Geochemistry

Exploring the nitrogen cycle in groundwater from microbiology and geochemistry perspectives. Discusses nitrogen fixation, reduction, denitrification, and sources of nitrates, emphasizing the importance of understanding this cycle for groundwater analysis.

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Nitrogen In Groundwater from Ground-Water Microbiology and Geochemistry

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  1. Nitrogen In GroundwaterfromGround-Water Microbiology and Geochemistry By: Francis H. Chapelle Images are from Google searches and for visual effect only

  2. The Nitrogen Cycle • Atmospheric Nitrogen (N2) • Microbially mediated nitrogen fixation, reduction, and oxidation • N2+6H+16ATP -->2NH3+16ADP+16P • N2 -->NH3 -->NO2- -->NO3- -->NH2 • Denitrification: NO3-->NO2-->N2O-->N2

  3. Nitrogen Cycling in Ground-Water Systems • Energy availability limits nitrogen fixation • Nitrification occurs under aerobic conditions • Denitrification occurs under anaerobic conditions • Nitrate in Groundwater: • Blue baby syndrome • Gastric cancer rates • Nitrate Sources to Ground-water: • Animal excrement and manure • Sewage effluents • Nitrogen fertilizers • Municipal wastes • Naturally occurring nitrate sources

  4. Animal Excrement and Manure

  5. Sewage Effluents

  6. Nitrogen Fertilizers

  7. Municipal Wastes

  8. Naturally occurring nitrate sources • 15N and 14N isotopes •  15N ratios

  9. Why is it important to understand the nitrogen cycle when analyzing groundwater composition? What are some of the limiting factors of the nitrogen cycle within groundwater systems?

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