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Related Concept Videos

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Secondary amines react with nitrous acid to form N-nitrosamines, as depicted in Figure 1. Nitrous acid, a weak and unstable acid, is formed in situ from an aqueous solution of sodium nitrite and strong acids, such as hydrochloric acid or sulfuric acid, in cold conditions. In the presence of an acid, the nitrous acid gets protonated. The subsequent loss of water results in the formation of the electrophile known as nitrosonium ion.

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An Experimental Protocol for Studying Mineral Effects on Organic Hydrothermal Transformations
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Nitrite reactivity with magnetite.

P Dhakal1, C J Matocha, F E Huggins

  • 1Department of Plant and Soil Sciences, University of Kentucky, Lexington, Kentucky 40546, United States.

Environmental Science & Technology
|May 14, 2013
PubMed
Summary
This summary is machine-generated.

Magnetite minerals can reduce nitrite (NO2(-)) in soils under iron-reducing conditions. This abiotic process, influenced by pH, transforms nitrite into nitric oxide (NO) and nitrous oxide (N2O).

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Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
06:53

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Published on: June 9, 2023

Area of Science:

  • Environmental Geochemistry
  • Soil Science
  • Mineral-Surface Reactions

Background:

  • Iron (Fe) redox cycling in soils is linked to nitrate (NO3(-)) reduction.
  • Magnetite, an Fe(2+)/Fe(3+) mineral, may react with nitrogen species.
  • Limited data exists on nitrite (NO2(-)) and nitrate (NO3(-)) interactions with magnetite.

Purpose of the Study:

  • Investigate the reactivity of NO3(-) and NO2(-) with magnetite.
  • Determine the influence of pH and dissolved Fe(2+) on these reactions.
  • Characterize the solid-phase products formed during the reactions.

Main Methods:

  • Batch kinetic experiments conducted under anoxic conditions.
  • Experiments performed across a pH range of 5.5-7.5.
  • Solid product characterization using X-ray diffraction (XRD), Mössbauer spectroscopy, and scanning electron microscopy (SEM).

Main Results:

  • Nitrite (NO2(-)) removal by magnetite was significantly faster than nitrate (NO3(-)) removal.
  • Nitrite reduction rate was pH-dependent, being twice as fast at pH 5.5 compared to pH 7.5.
  • Nitrite reduction was abiotically mediated by structural Fe(2+) in magnetite, producing nitric oxide (NO) and nitrous oxide (N2O).

Conclusions:

  • Magnetite can effectively remove nitrite from solution in Fe(3+)-reducing soils.
  • The abiotic reduction of nitrite by magnetite is a heterogeneous electron transfer process.
  • Dissolved Fe(2+) can adsorb to magnetite, accelerating nitrite reduction rates.