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Related Concept Videos

Inorganic Nitrogen Assimilation01:22

Inorganic Nitrogen Assimilation

242
Nitrogen is an essential element in biological systems, forming a crucial component of proteins, nucleic acids, and other cellular constituents. Many bacteria and archaea acquire nitrogen in the form of nitrate (NO₃⁻) or ammonia (NH₃), which are then assimilated into biomolecules through specific enzymatic pathways.Assimilatory Nitrate ReductionWhen nitrate enters the cell, it undergoes a two-step reduction process known as assimilatory nitrate reduction. Initially, the enzyme...
242
Overview of Nitrogen Metabolism01:20

Overview of Nitrogen Metabolism

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Nitrogen is a very important element for life because it is a major constituent of proteins and nucleic acids. It is a macronutrient, and in nature, it is recycled from organic compounds and stored in the form of  ammonia, ammonium ions, nitrate, nitrite, or  nitrogen gas by many metabolic processes. Many of these metabolic processes are carried out only by prokaryotes.
The largest pool of nitrogen available in the terrestrial ecosystem is gaseous nitrogen (N2) from the air, but this...
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Updated: Nov 12, 2025

Automated, High-resolution Mobile Collection System for the Nitrogen Isotopic Analysis of NOx
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[Identify the Nitrate Sources in Different Land Use Areas Based on Multiple Isotopes].

Zan-Fang Jin1, Jing Hu1, Ai-Jing Wu1

  • 1College of Environment, Zhejiang University of Technology, Hangzhou 310032, China.

Huan Jing Ke Xue= Huanjing Kexue
|March 20, 2021
PubMed
Summary

Land use significantly impacts river water quality. Urban areas show higher sewage/manure contributions to nitrate pollution, while agricultural areas are dominated by chemical fertilizers, highlighting distinct pollution sources.

Keywords:
SIAR modelhydrogen and oxygen isotopesland usenitratenitrogen and oxygen isotopes

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Area of Science:

  • Environmental Science
  • Geochemistry
  • Hydrology

Context:

  • Land use patterns critically influence regional water quality.
  • Urban and agricultural river systems exhibit distinct nitrogen pollution characteristics.
  • Stable isotope analysis is a powerful tool for tracing nutrient sources in aquatic environments.

Purpose:

  • To differentiate and quantify nitrate (NO₃⁻) sources in urban (Grand Canal) and agricultural/forest (Yuying River) river systems.
  • To assess the impact of land use on nitrogen cycling and pollution dynamics.
  • To apply stable isotope analysis (δD-H₂O, δ¹⁸O-H₂O, δ¹⁵N-NO₃⁻, δ¹⁸O-NO₃⁻) and the SIAR model for source apportionment.

Summary:

  • Nitrogen pollution levels varied between the Grand Canal and Yuying River.
  • Precipitation was the primary water source for both rivers, indicated by hydrogen and oxygen isotopes.
  • Nitrification was the dominant nitrogen cycling process, though denitrification occurred in sections of the Grand Canal.
  • Nitrate sources differed significantly: urban Grand Canal received more from sewage/manure and soil nitrogen, while agricultural Yuying River was dominated by chemical fertilizer.

Impact:

  • Urbanization and associated human activities (sewage, runoff) substantially increase sewage/manure contributions to nitrate pollution.
  • Agricultural non-point sources, particularly chemical fertilizers, represent a severe pollution issue in rural river systems.
  • Understanding these distinct pollution pathways is crucial for developing targeted water quality management strategies.