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Related Concept Videos

Atomic Absorption Spectroscopy: Interference01:25

Atomic Absorption Spectroscopy: Interference

2.1K
Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
Spectral interference occurs when signals from other elements or molecules overlap with the analyte signal, falsely elevating or masking the analyte's absorbance. This interference can be corrected using Zeeman,...
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Molecular Spectroscopy: Absorption and Emission01:14

Molecular Spectroscopy: Absorption and Emission

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Molecules possess discrete energy levels called quantum states. Unlike atoms, which have simpler energy levels, molecules possess additional rotational and vibrational energy levels.  Each energy level is separated by an energy gap, with the gaps between adjacent electronic, vibrational, and rotational levels varying significantly. The three types of energy levels in a diatomic molecule are shown in Figure 1.
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Atomic Absorption Spectroscopy: Overview01:27

Atomic Absorption Spectroscopy: Overview

3.6K
Atomic absorption spectroscopy (AAS) is a technique used to analyze elements by measuring electromagnetic radiation (EMR) absorbed by atoms, which causes them to transition to a higher-energy orbit. The most crucial step in AAS is atomization, where the analyte is converted into gas-phase atoms, typically through a flame or furnace. Some of these atoms become thermally excited in the flame, while most remain in the ground state.
When irradiated by EMR of a particular wavelength, these...
3.6K
Atomic Absorption Spectroscopy: Instrumentation01:22

Atomic Absorption Spectroscopy: Instrumentation

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An atomic absorption spectrophotometer (AAS) comprises several components: a radiation source, an atomizer, a monochromator, and a detector. The radiation source can be a hollow-cathode lamp (HCL) or an electrodeless-discharge lamp (EDL), both of which provide a narrow emission line of the required wavelength. However, some instruments use continuum sources and high-resolution monochromators to achieve a narrow range of radiation.
The atomizer used in AAS can be either a flame atomizer or an...
1.7K
Atomic Absorption Spectroscopy: Lab01:21

Atomic Absorption Spectroscopy: Lab

1.1K
For AAS measurements, samples must be introduced as clear solutions, often requiring extensive preliminary treatment to dissolve materials like soils, animal tissues, and minerals. Common methods for sample preparation include treatment with hot mineral acids, wet ashing, combustion in closed containers, high-temperature ashing, or fusion with reagents.
 Solutions containing organic solvents, such as low-molecular-mass alcohols, esters, or ketones, enhance absorbances by increasing...
1.1K
Atomic Spectroscopy: Effects of Temperature01:27

Atomic Spectroscopy: Effects of Temperature

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Atomization, converting samples into gas-phase atoms and ions, is essential for atomic spectroscopy. The flame temperature required for atomization affects the efficiency of the atomic spectroscopic methods by increasing the atomization efficiency and the relative population of the excited and ground states.
At thermal equilibrium, the relative populations of excited and ground state atoms can be estimated using the Maxwell–Boltzmann distribution. For example, an increase in temperature...
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Gas Temperature Measurement Using Differential Optical Absorption Spectroscopy (DOAS).

Qiang Gao1,2, Wubin Weng2, Bo Li1

  • 11 Tianjin University, State Key Laboratory of Engines, Tianjin, China.

Applied Spectroscopy
|June 19, 2018
PubMed
Summary

A new nonintrusive method uses differential optical absorption spectroscopy (DOAS) to measure gas temperature. This temperature-dependent spectra (TDS) approach offers precise and rapid measurements, outperforming traditional thermocouples.

Keywords:
DOASSulfur dioxideabsorption spectroscopydifferential optical absorption spectroscopytemperature measurement

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Area of Science:

  • Spectroscopy
  • Optical Measurement
  • Gas Analysis

Background:

  • Accurate gas temperature measurement is crucial for process control and safety.
  • Traditional methods like thermocouples can be intrusive and slow to respond.
  • Optical methods offer potential for nonintrusive and faster temperature determination.

Purpose of the Study:

  • To demonstrate a nonintrusive method for gas temperature measurement using DOAS.
  • To develop and validate a temperature-dependent spectra (TDS) approach for SO2 gas.
  • To compare the performance of the TDS method against thermocouple measurements.

Main Methods:

  • Utilized differential optical absorption spectroscopy (DOAS) in the 276-310 nm range.
  • Introduced temperature-dependent spectra (TDS) derived from SO2 absorption.
  • Established a calibration relationship between TDS and gas temperature through experiments.

Main Results:

  • The TDS-temperature relationship is independent of SO2 concentration.
  • Achieved precision < ±0.3% for SO2 > 150 ppm and ±0.4% at 1 ppm.
  • Relative deviation from thermocouple measurements was within 3% across 298-750 K.

Conclusions:

  • The DOAS-based TDS method provides accurate and precise nonintrusive gas temperature measurements.
  • The TDS method demonstrates a faster response time compared to thermocouples.
  • This technique is suitable for applications requiring rapid and accurate gas temperature monitoring.