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Related Concept Videos

Gas Chromatography: Types of Detectors-II01:19

Gas Chromatography: Types of Detectors-II

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...
Gas Chromatography: Types of Detectors-I01:21

Gas Chromatography: Types of Detectors-I

There are different types of detectors used in gas chromatography, each with its own specific properties that make it suitable for detecting certain types of analytes. The most commonly used detectors in GC are thermal conductivity detector (TCD), flame ionization detector (FID), and electron capture detector (ECD).
TCD is the earliest and most widely used detector that operates by measuring the changes in the thermal conductivity of the carrier gas. When a sample compound enters the detector,...
Gas Chromatography: Overview of Detectors01:13

Gas Chromatography: Overview of Detectors

Detectors in gas chromatography (GC) help identify and quantify the components of a mixture by translating chemical properties into measurable signals, which are displayed on a chromatogram. Detectors can be categorized into two main types: destructive and non-destructive.
A non-destructive detector allows a sample to be analyzed without altering or consuming it, meaning the sample can be collected after detection for further analysis. Examples include thermal conductivity detectors and...
Flame Photometry: Lab01:16

Flame Photometry: Lab

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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Updated: Jun 15, 2026

Fast and Accurate Exhaled Breath Ammonia Measurement
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Fast and Accurate Exhaled Breath Ammonia Measurement

Published on: June 11, 2014

A simple and highly sensitive colorimetric detection method for gaseous formaldehyde.

Liang Feng1, Christopher J Musto, Kenneth S Suslick

  • 1Department of Chemistry, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, Illinois 61801, USA.

Journal of the American Chemical Society
|March 12, 2010
PubMed
Summary
This summary is machine-generated.

A new colorimetric sensor detects gaseous formaldehyde using functionalized polymer films. This rapid, sensitive method identifies formaldehyde at low levels, crucial for workplace safety monitoring.

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Highly Sensitive and Rapid Fluorescence Detection with a Portable FRET Analyzer
08:27

Highly Sensitive and Rapid Fluorescence Detection with a Portable FRET Analyzer

Published on: October 1, 2016

Area of Science:

  • Environmental chemistry
  • Polymer science
  • Analytical chemistry

Background:

  • Formaldehyde is a common indoor air pollutant with significant health risks.
  • Existing detection methods can be slow, expensive, or lack sensitivity.
  • Accurate monitoring is essential for occupational safety and public health.

Purpose of the Study:

  • To develop a rapid and sensitive colorimetric method for formaldehyde detection.
  • To create a sensor effective at concentrations below occupational exposure limits.
  • To assess the sensor's performance regarding speed, sensitivity, and interference.

Main Methods:

  • Utilizing amine-functionalized polymer films doped with a pH indicator.
  • Exposing the films to gaseous formaldehyde at various concentrations.
  • Observing visible color changes for quantitative detection.
  • Testing sensor response under varying humidity and temperature conditions.

Main Results:

  • Visible color changes observed within 1 minute, even at the permissible exposure limit (PEL) of 750 ppb.
  • Limit of detection below 50 ppb (7% of PEL) after 10 minutes.
  • Sensor performance unaffected by humidity or temperature fluctuations (4-50°C).
  • No significant interference from common airborne compounds.

Conclusions:

  • The developed colorimetric sensor offers a rapid, sensitive, and quantitative method for formaldehyde detection.
  • This technology is suitable for monitoring formaldehyde at levels relevant to workplace safety.
  • The sensor's robustness against environmental factors and interferents enhances its practical applicability.