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Indicators02:39

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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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Understanding and evaluating diffusion and perfusion is critical in assessing a patient's respiratory and circulatory health. These processes play key roles in maintaining the body's internal environment, ensuring that tissues receive adequate oxygen while waste products are efficiently removed.
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In gas chromatography, different detectors are employed to meet specific analytical needs. These detectors are often categorized based on their detection mechanisms and the types of compounds they are best suited to analyze. Thermal Conductivity Detectors (TCD), Flame Ionization Detectors (FID), and Electron Capture Detectors (ECD) represent common categories, each with unique operating principles and applications. However, beyond these, several other detectors are designed for more specialized...
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Titrimetric Methods: Types and Commonly Used Strategies01:08

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In chemistry, titrimetric methods are broadly classified into three types: volumetric, gravimetric, and coulometric. Volumetric titrations involve measuring the volume of a titrant of known concentration that is required to react completely with an analyte. In gravimetric titrations, the standard solution reacts with the analyte to form an insoluble precipitate, which is filtered, dried, and weighed. In coulometric titrations, current is applied to an electrochemical reaction until the reaction...
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Complexometric Titration: Overview00:39

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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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Related Experiment Video

Updated: Jul 20, 2025

Qualitative Identification of Carboxylic Acids, Boronic Acids, and Amines Using Cruciform Fluorophores
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Qualitative Identification of Carboxylic Acids, Boronic Acids, and Amines Using Cruciform Fluorophores

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Colorimetric CO2 Indicators.

Andrew Mills1, Lauren McDonnell1, Dilidaer Yusufu1

  • 1School of Chemistry and Chemical Engineering, Queens University Belfast, David Keir Building, Stranmillis Road, Belfast BT95AG, U.K.

Accounts of Materials Research
|August 3, 2023
PubMed
Summary
This summary is machine-generated.

This study transforms carbon dioxide (CO2) colorimetric indicators into dry, portable formats like inks and plastics. These novel CO2 sensors offer advantages in simplicity, cost, and portability for various applications.

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Area of Science:

  • Analytical Chemistry
  • Materials Science
  • Environmental Science

Background:

  • Carbon dioxide (CO2) plays vital roles in biological and industrial processes.
  • Current CO2 monitoring methods (FTIR, electrochemical) have limitations.
  • Existing CO2 indicators are often water-based, limiting portability and application.

Purpose of the Study:

  • To develop novel, dry CO2-sensitive materials from traditional colorimetric indicators.
  • To highlight advancements in CO2 colorimetric indicator technology by the Mills group.
  • To demonstrate the versatility and advantages of dry CO2 indicators over current methods.

Main Methods:

  • Development of CO2-sensitive inks using pH-sensitive dyes and quaternary ammonium cations in non-aqueous polymer solutions.
  • Creation of CO2-sensitive pigments by coating silica particles with CO2 inks.
  • Incorporation of pigments into plastics via extrusion to form CO2-sensitive films.
  • Utilizing digital camera colorimetry (DCC) for quantitative CO2 measurements.

Main Results:

  • Dry CO2-sensitive inks exhibit reversible color changes in response to CO2, with tunable sensitivity.
  • CO2-sensitive pigments integrated into plastics offer enhanced properties for applications like food packaging and medical diagnostics.
  • Demonstrated quantitative CO2 analysis using DCC, overcoming limitations of visual assessment.
  • Developed specialized indicators for temperature, fizziness in beverages, and air pressure.

Conclusions:

  • Dry CO2 colorimetric indicators represent a significant advancement over traditional methods.
  • These materials offer enhanced portability, cost-effectiveness, and a wider range of applications.
  • Digital camera colorimetry enables quantitative analysis, increasing the commercial viability and impact of these CO2 indicators.