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

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Presentation on theme: "Nitrogen In Groundwater from Ground-Water Microbiology and Geochemistry By: Francis H. Chapelle Images are from Google searches and for visual effect only."— Presentation transcript:

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

2 The Nitrogen Cycle  Atmospheric Nitrogen (N 2 )  Microbially mediated nitrogen fixation, reduction, and oxidation  N 2 +6H+16ATP -->2NH 3 +16ADP+16P  N 2 -->NH 3 -->NO >NO >NH 2  Denitrification: NO 3 -->NO 2 -->N 2 O-->N 2  Atmospheric Nitrogen (N 2 )  Microbially mediated nitrogen fixation, reduction, and oxidation  N 2 +6H+16ATP -->2NH 3 +16ADP+16P  N 2 -->NH 3 -->NO >NO >NH 2  Denitrification: NO 3 -->NO 2 -->N 2 O-->N 2

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  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  15 N and 14 N isotopes   15 N ratios  15 N and 14 N isotopes   15 N 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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