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Related Concept Videos

2° Amines to N-Nitrosamines: Reaction with NaNO201:20

2° Amines to N-Nitrosamines: Reaction with NaNO2

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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.
4.2K
1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Overview01:26

1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Overview

3.3K
Nitrous acid and nitric acids are two types of acids containing nitrogen, among which nitrous acid is weaker than nitric acid. Nitrous acid with a pKa value of 3.37 ionizes in water to give a nitrite ion and the hydronium ion.
The nitrous acid is unstable. Hence, it is formed in situ from a solution of sodium nitrite and cold aqueous acids such as hydrochloric or sulfuric acid. In an acidic solution, the –OH group of nitrous acid undergoes protonation to give oxonium ion, followed by...
3.3K
Enzyme Inhibition01:30

Enzyme Inhibition

78.2K
Inhibitors are molecules that reduce enzyme activity by binding to the enzyme. In a normally functioning cell, enzymes are regulated by a variety of inhibitors. Drugs and other toxins can also inhibit enzymes. Some inhibitors bind to the enzyme’s active site, while others inhibit enzymatic activity by binding to other sites on the protein structure.
78.2K
meta-Directing Deactivators: –NO2, –CN, –CHO, –⁠CO2R, –COR, –CO2H01:13

meta-Directing Deactivators: –NO2, –CN, –CHO, –⁠CO2R, –COR, –CO2H

5.5K
All meta-directing substituents are deactivating groups. These substituents withdraw electrons from the aromatic ring, making the ring less reactive toward electrophilic substitution. For example, the nitration of nitrobenzene is 100,000 times slower than that of benzene because of the deactivating effect of the nitro group. The first step in an electrophilic aromatic substitution is the addition of an electrophile to form a resonance-stabilized carbocation. The energy diagrams for...
5.5K
1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Mechanism01:37

1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Mechanism

3.8K
Nitrous acid is a relatively weak and unstable acid prepared in situ by the reaction of sodium nitrite and cold, dilute hydrochloric acid. In an acidic solution, the nitrous acid undergoes protonation when it loses water to form a nitrosonium ion—an electrophile. Nitrous acid reacts with primary amines to give diazonium salts. The reaction is called diazotization of primary amines.
3.8K
The Nitrogen Cycle01:49

The Nitrogen Cycle

51.9K
Nitrogen atoms, present in all proteins and DNA, are recycled between abiotic and biotic components of the ecosystem. However, the primary form of nitrogen on Earth is nitrogen gas, which cannot be used by most animals and plants. Thus, nitrogen gas must first be converted into a usable form by nitrogen-fixing bacteria before it can be cycled through other living organisms. The use of nitrogen-containing fertilizers and animal waste products in human agriculture has greatly influenced the...
51.9K

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Related Experiment Video

Updated: Jun 21, 2025

Estimating Sediment Denitrification Rates Using Cores and N2O Microsensors
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Estimating Sediment Denitrification Rates Using Cores and N2O Microsensors

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Addressing challenges associated with nitrification inhibitors.

Yong Zhang1, Diego Abalos2, Xiaoli Cheng3

  • 1Ministry of Education Key Laboratory for Transboundary Ecosecurity of Southwest China, School of Ecology and Environmental Science, Yunnan University, Kunming, China.

Trends in Microbiology
|July 10, 2024
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Nitrification inhibitors (NIs) offer global yield benefits but require more research into their environmental and health impacts. Future priorities include understanding NI limitations and their effects on ecosystems and organisms.

Keywords:
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Area of Science:

  • Agricultural Science
  • Environmental Science
  • Soil Science

Background:

  • Nitrification inhibitors (NIs) are increasingly used in agriculture to improve nitrogen use efficiency and crop yields.
  • Despite widespread adoption, significant uncertainties and limitations associated with NI application persist.
  • Assessing the broader ecological and health implications of NIs is critical for sustainable agricultural practices.

Purpose of the Study:

  • To present a comprehensive global budget of nitrification inhibitor use.
  • To identify and discuss the current challenges and limitations of nitrification inhibitors.
  • To outline future research priorities for understanding and optimizing NI application.

Main Methods:

  • Global data compilation on NI usage patterns.
  • Literature review and synthesis of existing research on NI impacts.
  • Expert consultation to identify key challenges and research gaps.

Main Results:

  • Quantification of global trends in nitrification inhibitor adoption.
  • Identification of key environmental and agronomic challenges associated with NIs.
  • Prioritization of research areas, including ecosystem health and human well-being.

Conclusions:

  • While NIs provide yield advantages, their widespread use necessitates a deeper understanding of associated risks.
  • Addressing current limitations and uncertainties is crucial for maximizing the benefits of NIs.
  • Future research should focus on comprehensive risk assessments and sustainable application strategies for NIs.