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Assessment of excess N2 for quantifying actual denitrification in NZ groundwater systems

journal contribution
posted on 2024-06-21, 03:49 authored by Heather Martindale, Rob van der Raaij, Christopher Daughney, Uwe Morgenstern, Ranvir Singh, Neha Jha, John Hadfield
Denitrification in groundwaters is a key nitrate (NO3) attenuation process, where leached NO3 can be reduced to gaseous forms of nitrogen (N2). In this study, calculation of the concentration of excess N2 is applied to the New Zealand context to quanitfy the extent of denitrification occurring in groundwater systems under natural flow conditions. The concentration of dissolved atmospheric N2, according to the recharge conditions of the water, can be established by the measurement of two noble gases that are also part of the atmosphere. This enables differntiation of the excess N2 gas produced via denitrification reactions from atmospherically derived N2 gas.

Funding

Funded by the New Zealand Ministry for Business, Innovation and Employment's Our Land and Water National Science Challenge (Toitū te Whenua, Toiora te Wai) as part of project Measuring Denitrification

History

Publication date

2019-07-07

Language

  • English

Does this contain Māori information or data?

  • No

Journal title

Journal of Hydrology (New Zealand)

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