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Related Concept Videos

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

2° Amines to N-Nitrosamines: Reaction with NaNO2

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.
Colloidal precipitates01:09

Colloidal precipitates

The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
Formation of Complex Ions03:45

Formation of Complex Ions

A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
Inorganic Nitrogen Assimilation01:22

Inorganic Nitrogen Assimilation

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 nitrate reductase...
Microbial Corrosion01:24

Microbial Corrosion

Microbiologically Influenced Corrosion (MIC) is a significant form of material degradation caused by the metabolic activities of microorganisms. This phenomenon poses substantial challenges across various industries, including oil and gas, maritime, and water treatment sectors.MIC occurs when microorganisms, such as bacteria, archaea, and fungi, colonize metal surfaces, forming biofilms that alter the local electrochemical environment. These biofilms can lead to the production of corrosive...
Microbes and the Nitrogen Cycle01:26

Microbes and the Nitrogen Cycle

The nitrogen cycle is a complex biogeochemical process critical to maintaining the balance of nitrogenous compounds in ecosystems. This cycle involves multiple microbial-mediated transformations through which nitrogen changes oxidation states, supporting essential ecological functions and contributing to plant and microbial growth.Nitrogen Fixation and AmmonificationNitrogen fixation initiates the cycle by converting inert atmospheric nitrogen (N₂) into bioavailable ammonia (NH₃), a process...

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Related Experiment Video

Updated: Jun 23, 2026

Synthesis of Multi-walled Carbon Nanotubes Modified with Silver Nanoparticles and Evaluation of Their Antibacterial Activities and Cytotoxic Properties
11:19

Synthesis of Multi-walled Carbon Nanotubes Modified with Silver Nanoparticles and Evaluation of Their Antibacterial Activities and Cytotoxic Properties

Published on: May 10, 2018

Nitrification inhibition by silver nanoparticles.

O K Choi1, Z Q Hu

  • 1Department of Civil and Environmental Engineering, University of Missouri-Columbia, E2509 Lafferre Hall, Columbia, MO 65211, USA.

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|May 19, 2009
PubMed
Summary
This summary is machine-generated.

Silver nanoparticles (nanosilver) are toxic to nitrifying bacteria in wastewater treatment. However, sulfide can reduce nanosilver toxicity, suggesting a potential mitigation strategy for wastewater applications.

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Evaluation of Antimicrobial Activities of Nanoparticles and Nanostructured Surfaces In Vitro
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Evaluation of Antimicrobial Activities of Nanoparticles and Nanostructured Surfaces In Vitro

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Area of Science:

  • Environmental Science
  • Microbiology
  • Nanotechnology

Background:

  • Nitrification is a key process in wastewater treatment.
  • Silver nanoparticles (nanosilver) are increasingly used but their environmental impact is not fully understood.
  • Potential toxicity of nanosilver to microbial communities in wastewater treatment plants needs evaluation.

Purpose of the Study:

  • To assess the nitrification inhibition potential of silver nanoparticles (nanosilver).
  • To compare the toxicity of nanosilver with silver ions and silver chloride colloids.
  • To investigate factors influencing nanosilver toxicity in a wastewater treatment context.

Main Methods:

  • Extant respirometry was employed.
  • Enriched nitrifying bacteria from wastewater treatment plants were used.
  • Toxicity was evaluated at 1 mg/L silver concentration.

Main Results:

  • Silver nanoparticles exhibited higher toxicity compared to silver ions and silver chloride colloids.
  • Cell membrane integrity was not compromised by any silver form at 1 mg/L Ag.
  • The toxicity of silver nanoparticles was significantly reduced by the presence of anions, particularly sulfide.

Conclusions:

  • Silver nanoparticles behave similarly to silver ions regarding surface complexation.
  • The inhibitory effect of nanosilver in wastewater treatment can potentially be mitigated by reactions with soluble sulfide species.
  • Sulfide presents a promising strategy for managing nanosilver toxicity in biological wastewater treatment systems.