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Related Concept Videos

Atomic Absorption Spectroscopy: Lab01:21

Atomic Absorption Spectroscopy: Lab

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 nebulizer...
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...
Flame Photometry: Overview01:02

Flame Photometry: Overview

Flame photometry, also known as flame emission spectrometry, is a technique used for the qualitative and quantitative analysis of elements present in a sample using a flame as the source of excitation energy. The concept of flame photometry was realized in the early 1860s by Kirchhoff and Bunsen, who discovered that specific elements emit characteristic radiation when excited in flames. The first instrument developed for this purpose was used to measure sodium (Na) in plant ash using a Bunsen...
Atomic Fluorescence Spectroscopy01:29

Atomic Fluorescence Spectroscopy

Atomic fluorescence spectroscopy (AFS) is an analytical technique that involves the electronic transitions of atoms in a flame, furnace, or plasma being excited by electromagnetic (EM) radiation. When these atoms absorb energy, they become excited and subsequently release energy as they return to their original state. This emitted light, or "fluorescence," is observed at a right angle to the incident beam. Both absorption and emission processes transpire at distinct wavelengths, which are...
Atomic Absorption Spectroscopy: Atomization Methods01:25

Atomic Absorption Spectroscopy: Atomization Methods

Atomic Absorption Spectroscopy (AAS) atomizes samples through flame atomization or electrothermal atomization. Flame atomization typically involves a nebulizer and spray chamber assembly to combine the sample with a fuel–oxidant mixture, creating a fine aerosol mist that enters a burner. Typically, the fuel and oxidant are combined in an approximately stoichiometric ratio. However, for atoms that are easily oxidized, a fuel-rich mixture may be more advantageous. Only about 5% of the aerosol...
Atomic Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers.  Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.

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Related Experiment Video

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Flame Experiments at the Advanced Light Source: New Insights into Soot Formation Processes
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Published on: May 26, 2014

A continuous-dilution calibration technique for flame atomic-absorption spectrophotometry.

J F Tyson1, J M Appleton

  • 1Department of Chemistry, University of Technology, Loughborough, Leicestershire, England.

Talanta
|January 1, 1984
PubMed
Summary

Calibration in atomic-absorption spectrometry (AAS) is simplified using a concentration-gradient chamber. This method rapidly calibrates analytes across the full working range with high accuracy, eliminating curve-fitting approximations.

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy

Background:

  • Traditional calibration in atomic-absorption spectrometry often requires multiple standard solutions and can be time-consuming.
  • Conventional methods may involve complex curve-fitting approximations, introducing potential errors.
  • The accuracy of calibration is crucial for reliable quantitative analysis in AAS.

Purpose of the Study:

  • To develop a rapid and accurate calibration method for atomic-absorption spectrometry.
  • To eliminate the need for multiple standard solutions and curve-fitting approximations.
  • To achieve high precision calibration across the entire working concentration range.

Main Methods:

  • Utilized a concentration-gradient chamber for calibration.
  • Employed a single concentrated standard solution.
  • Directly generated a calibration range without curve fitting.

Main Results:

  • Achieved rapid calibration for atomic-absorption spectrometry.
  • Calibration extended over the entire working concentration range of the analyte.
  • Deviations were less than 1% with well-designed apparatus, demonstrating high accuracy.
  • Eliminated the requirement for curve-fitting approximations.

Conclusions:

  • The concentration-gradient chamber offers a simplified, rapid, and accurate calibration method for atomic-absorption spectrometry.
  • This approach is independent of the conventional calibration curve shape.
  • The technique provides a high-precision alternative to traditional calibration methods.