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Related Concept Videos

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: 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: 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.
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High-Performance Liquid Chromatography: Types of Detectors01:15

High-Performance Liquid Chromatography: Types of Detectors

The role of the detectors in High-Performance Liquid Chromatography (HPLC) is to analyze the solutes as they exit from the chromatographic column. The detector recognizes the solute's property and generates corresponding electrical signals, which are converted into a readable graph of the detector's response versus elution time called a chromatogram at the computer. There are several types of HPLC detectors, each with its own advantages and limitations, depending on the analyte properties and...
Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
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Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...

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Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor
07:28

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Published on: August 30, 2012

An optical waveguide acid vapor sensor.

D S Ballantine1, D Callahan, G J Maclay

  • 1Chemistry Department, Northern Illinois University De Kalb, IL 60115, U.S.A.

Talanta
|December 1, 1992
PubMed
Summary
This summary is machine-generated.

This study presents a novel optical waveguide sensor for detecting acid vapors. The bromothymol blue and Nafion-based sensor offers rapid, reversible detection of specific acid gases.

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Area of Science:

  • Chemical sensing technologies
  • Optical waveguide sensors
  • Analytical chemistry

Background:

  • Development of sensitive and selective chemical sensors is crucial for environmental monitoring and industrial safety.
  • Optical waveguide sensors offer potential advantages in sensitivity and miniaturization for gas detection.
  • Bromothymol blue and Nafion polymer are established materials for acid-base indicator applications.

Purpose of the Study:

  • To design and characterize an optical waveguide sensor for the detection of protonic acid vapors.
  • To evaluate the sensor's response to various acid vapors, including hydrochloric acid and hydrogen sulfide.
  • To investigate potential interferences and methods for correction, such as water vapor effects.

Main Methods:

  • Fabrication of an optical waveguide sensor utilizing a chemically sensitive coating of bromothymol blue indicator in a Nafion polymer film.
  • Employing a 562 nm LED as the light source and a phototransistor as the detector.
  • Testing sensor response to different acid vapors (HCl, H2S, CO2) and water vapor.

Main Results:

  • The sensor demonstrated rapid and reversible responses to hydrochloric acid and hydrogen sulfide vapors.
  • An estimated detection limit for hydrogen sulfide was found to be less than 15 ppm.
  • The sensor showed a generalized response to protonic acid vapors but no response to carbon dioxide.

Conclusions:

  • The developed optical waveguide sensor is effective for detecting specific protonic acid vapors.
  • Water vapor presents a systematic interference, which can be mitigated using a reference sensor or dual-wavelength monitoring.
  • This sensor technology shows promise for selective acid vapor detection in various applications.