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Nitrogen In Groundwater from Ground-Water Microbiology and Geochemistry

Nitrogen In Groundwater from Ground-Water Microbiology and Geochemistry. By: Francis H. Chapelle. Images are from Google searches and for visual effect only. The Nitrogen Cycle. Atmospheric Nitrogen (N 2 ) Microbially mediated nitrogen fixation, reduction, and oxidation

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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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