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AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...
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Atomic Absorption Spectroscopy: Lab01:21

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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.
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Atomic Absorption Spectroscopy: Atomization Methods01:25

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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...
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Atomic spectroscopy is a vital tool in elemental analysis, both qualitatively and quantitatively. It can be broadly divided into optical spectroscopy, mass spectroscopy, and X-ray spectroscopy methods. The optical spectroscopic methods are atomic absorption spectroscopy (AAS), atomic emission spectroscopy (AES), and atomic fluorescence spectroscopy (AFS). The first step in all three methods is atomization, where the solid, liquid, or solution-phase samples are converted into gas-phase atoms and...
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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.
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Elemental analysis of levitated solid samples by microwave-assisted laser induced breakdown spectroscopy.

Ali M Alamri1, Wanxia Zhao1, Steve Tassios2

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A new contactless elemental analysis technique uses microwave-assisted laser-induced breakdown spectroscopy (MW-LIBS) with acoustically levitated samples. This method significantly enhances signals and improves repeatability for analyzing small samples at ambient conditions.

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Materials Science

Background:

  • Elemental analysis of small samples is challenging.
  • Traditional methods often require sample preparation and can be destructive.
  • Contactless analysis at ambient conditions is desirable for sensitive applications.

Purpose of the Study:

  • To develop a novel contactless elemental analysis technique.
  • To enhance signal detection and reduce self-absorption in spectroscopy.
  • To demonstrate the feasibility of microwave-assisted laser-induced breakdown spectroscopy (MW-LIBS) with acoustically levitated samples.

Main Methods:

  • Microwave-assisted laser-induced breakdown spectroscopy (MW-LIBS) was applied to acoustically levitated solid samples.
  • Three different solid samples (mineral ore, aluminum oxide, gypsum) were analyzed.
  • Signal enhancements and spectral line self-absorption were quantified.

Main Results:

  • Significant signal enhancements were observed for multiple elements (e.g., Mn, Al, Ca) using MW-LIBS-Levitation.
  • Self-absorption of specific spectral lines (Ca, Na) was minimized.
  • The technique demonstrated high repeatability (∼80% successful detection per pulse) and contactless operation.

Conclusions:

  • MW-LIBS-Levitation is a highly sensitive and repeatable contactless elemental analysis technique.
  • It operates effectively at ambient conditions, requiring minimal sample mass.
  • Potential applications include forensics, isotope analysis, and medical diagnostics with limited sample availability.