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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...
Atomic Emission Spectroscopy: Lab01:29

Atomic Emission Spectroscopy: Lab

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...
Sample Preparation for Analysis: Overview01:21

Sample Preparation for Analysis: Overview

Sample preparation is an essential step in the analytical process. It involves preparing a sample so that it can be analyzed accurately. The goal is to extract the analyte, the substance you want to measure, from the sample while removing any components that may interfere with the analysis. Sample preparation techniques vary depending on the physical state of the sample.
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Sample Preparation for Analysis: Advanced Techniques01:08

Sample Preparation for Analysis: Advanced Techniques

Accurate analysis of complex samples often requires advanced preparation techniques to achieve reliable and reproducible results. Samples containing inorganic or organic materials can be challenging to dissolve or decompose effectively. Standard sample preparation methods include acid digestion, fusion, dry ashing, and wet digestion.
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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 Absorption Spectroscopy: Radiation and Light Sources01:13

Atomic Absorption Spectroscopy: Radiation and Light Sources

Atomic absorption spectroscopy (AAS) relies on the Beer-Lambert law, which requires that the radiation source emits a narrow range of wavelengths to match the absorption characteristics of the analyte atom. The primary criteria for choosing an appropriate radiation source in AAS is to provide a precise and intense emission at specific wavelengths that will allow accurate detection of the analyte.
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Dependence of Laser-induced Breakdown Spectroscopy Results on Pulse Energies and Timing Parameters Using Soil Simulants
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Published on: September 23, 2013

Sample presentation considerations in laser-induced breakdown spectroscopy in aqueous solution.

Xiao Fang1, S Rafi Ahmad

  • 1DMAS, DCMT, Cranfield University, Shrivenham, Swindon, Wilts., United Kingdom. x.fang@cranfield.ac.uk

Applied Spectroscopy
|October 4, 2007
PubMed
Summary
This summary is machine-generated.

A water jet configuration for laser-induced breakdown spectroscopy (LIBS) significantly enhances elemental analysis sensitivity in aqueous media. This method offers a 10x higher signal-to-noise ratio compared to bulk excitation, enabling cost-effective detection.

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Environmental Science

Background:

  • Laser-induced breakdown spectroscopy (LIBS) is a powerful technique for elemental analysis.
  • Analyzing aqueous samples with LIBS presents challenges in sample presentation and sensitivity.
  • Optimizing sample presentation is crucial for improving LIBS performance in water environments.

Purpose of the Study:

  • To compare the effectiveness of two LIBS sample presentation configurations for aqueous media.
  • To quantitatively assess the signal-to-noise ratio (S/N) improvements offered by different methods.
  • To determine the optimal configuration for sensitive and cost-effective elemental analysis in water.

Main Methods:

  • Direct comparison of plasma excitation within water bulk versus on a water jet surface.
  • Utilizing the same LIBS system and experimental conditions for both methods.
  • Recording and analyzing temporal characteristics and spectral data of induced plasma.
  • Evaluating signal-to-noise ratios for elements like Ca, Na, Zn, Cd, and Hg.

Main Results:

  • The water jet configuration achieved an approximately 10-fold higher signal-to-noise ratio (S/N) compared to bulk excitation.
  • Sensitivity enhancement varied depending on the specific element analyzed.
  • Typical spectra for various elements (Na, Ca, Zn, Cd, Hg) were successfully detected and compared.

Conclusions:

  • A water jet sample presentation configuration offers superior sensitivity for elemental analysis in aqueous samples using LIBS.
  • This method is suitable for developing cost-effective commercial applications for water quality monitoring.
  • The findings support the implementation of water jet LIBS for improved environmental elemental analysis.