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Related Concept Videos

Precipitation Titration: Endpoint Detection Methods01:19

Precipitation Titration: Endpoint Detection Methods

2.6K
In argentometric precipitation titrations, endpoints can be detected visually by the Mohr, Volhard, and Fajans methods. In the Mohr method, adding a soluble chromate indicator gives an initial yellow color to the analyte solution. As the titrant is added, the first excess of silver ions forms a red silver chromate precipitate, marking the endpoint. The solution pH should be maintained at about 8 by adding solid CaCO3.
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2.6K
Indicators02:39

Indicators

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Certain organic substances change color in dilute solution when the hydronium ion concentration reaches a particular value. For example, phenolphthalein is a colorless substance in any aqueous solution with a hydronium ion concentration greater than 5.0 × 10−9 M (pH < 8.3). In more basic solutions where the hydronium ion concentration is less than 5.0 × 10−9 M (pH > 8.3), it is red or pink. Substances such as phenolphthalein, which can be used to determine the pH of a solution, are...
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Flame Photometry: Lab01:16

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In a flame photometer, when a solution like potassium chloride is aspirated into the flame, the solvent evaporates, leaving behind dehydrated salt. This salt dissociates into free gaseous atoms in their ground state. Some of these atoms absorb energy from the flame, leading to their excitation. The excited atoms return to the ground state, emitting photons at characteristic wavelengths. Because only electronic transitions are involved, the resulting emission lines are very narrow. The intensity...
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Complexometric Titration: Overview00:39

Complexometric Titration: Overview

9.5K
Complexometric titration involves the formation of a complex by reacting a metal ion with one or more ligands. A visual indicator often detects the end point of a complexometric titration. It is added to the metal solution before the titration, forming a stable metal–indicator complex and imparting color to the solution. As the titration approaches the equivalence point, the excess of the added ligand displaces the indicator from the metal–indicator complex, releasing the free...
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Precipitation of Ions03:11

Precipitation of Ions

29.1K
Predicting Precipitation
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
29.1K
Potentiometry: Types of Electrodes01:19

Potentiometry: Types of Electrodes

1.4K
Reference electrodes serve as a stable reference point for potentiometric measurements, while indicator and working electrodes react to variations in the composition of a solution.
The Standard Hydrogen Electrode (SHE) is a widely used reference electrode that maintains zero potential across all temperatures. However, its need for a continuous hydrogen gas supply renders it impractical for everyday use.
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Related Experiment Video

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Dynamic Electrochemical Measurement of Chloride Ions
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Solid-phase colorimetric sensor for hypochlorite.

Lee Wonjung1, Hyunho Youn, Jinyoung Bae

  • 1School of Chemical Engineering, Sungkyunkwan University, 16419, Republic of Korea. b521@skku.edu dhkim1@skku.edu.

The Analyst
|February 23, 2021
PubMed
Summary

A novel solid-phase sensor detects hypochlorite (OCl-) using gold nanoparticles (AuNPs). This sensor offers stable, naked-eye detection, changing color from blue to red within minutes, ideal for practical applications.

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Area of Science:

  • Nanotechnology
  • Analytical Chemistry
  • Materials Science

Background:

  • Hypochlorite (OCl-) is a reactive oxygen species with significant implications in biological and environmental systems.
  • Existing colorimetric sensors for OCl- often suffer from instability and interference in solution-based formats.
  • Development of robust, portable sensors for OCl- detection is crucial for various applications.

Purpose of the Study:

  • To develop a stable, solid-phase colorimetric sensor for the detection of hypochlorite (OCl-).
  • To utilize the unique optical properties of gold nanoparticles (AuNPs) for sensitive OCl- detection.
  • To provide a sensor with enhanced stability and potential for miniaturization.

Main Methods:

  • Immobilization of 13 nm gold nanoparticles (AuNPs) onto a 3-aminopropyltriethoxysilane (APTES) coated substrate.
  • Exploitation of AuNP aggregation and anti-aggregation behavior influenced by the interaction between dithiothreitol (DTT) and OCl-.
  • Colorimetric analysis of substrate color change (blue to red) for OCl- quantification.

Main Results:

  • The developed solid-phase sensor enabled naked-eye detection of OCl-.
  • Sensitive detection was achieved at concentrations as low as 2.48 μM within a 5-minute reaction time.
  • The sensor demonstrated superior stability compared to conventional solution-based methods, unaffected by ionic strength, pH, or temperature.

Conclusions:

  • The solid-phase AuNP-based sensor provides a stable and sensitive platform for OCl- detection.
  • The sensor's design offers advantages in terms of portability, durability, and ease of use for practical applications.
  • This approach holds promise for the development of miniaturized sensors for routine OCl- monitoring.