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Related Concept Videos

Atomic Emission Spectroscopy: Overview01:20

Atomic Emission Spectroscopy: Overview

3.0K
Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
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Atomic Emission Spectroscopy: Lab01:29

Atomic Emission Spectroscopy: Lab

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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 Spectroscopy: Absorption, Emission, and Fluorescence01:23

Atomic Spectroscopy: Absorption, Emission, and Fluorescence

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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 Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

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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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Speciation Rates01:07

Speciation Rates

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Overview
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Mass Spectrometry: Isotope Effect01:13

Mass Spectrometry: Isotope Effect

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Most elements exist in nature as a mixture of isotopes. The isotopes differ in weight due to their respective number of neutrons. The molecular weight of a molecule is different depending on the specific isotope of its elements involved. As a result, the mass spectrum of the molecule exhibits peaks from the same fragment at multiple positions. The positions of these mass signals depend on the mass differences between isotopes. Furthermore, the intensity of these signals is dependent on the...
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[The progress in speciation analysis of trace elements by atomic spectrometry].

Zeng-Huan Wang1, Xu-Nuo Wang2, Chang-Liang Ke2

  • 1Key Lab of Fishery Ecology Environment, Guangdong Province, South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences; Key Lab of Aquatic Product Processing, Ministry of Agriculture, Guangzhou, China. zh-wang1211@163.com

Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu
|March 12, 2014
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Summary

This review summarizes non-chromatographic methods for trace element speciation analysis across various fields. It evaluates techniques like liquid extraction and solid-phase extraction for geological, environmental, and medical applications.

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Area of Science:

  • Analytical Chemistry
  • Environmental Science
  • Geochemistry
  • Biochemistry

Background:

  • Accurate speciation analysis of trace elements is crucial for understanding their behavior and impact in diverse matrices.
  • Traditional chromatographic methods can be complex and time-consuming for trace element speciation.

Purpose of the Study:

  • To review and evaluate non-chromatographic techniques for trace element speciation analysis.
  • To summarize sample processing methods and assess strategies for these techniques.
  • To discuss the principles, advantages, and disadvantages of various liquid and solid-phase extraction methods.

Main Methods:

  • Review of liquid extraction techniques: conventional solvent extraction, cloud point extraction, single droplet microextraction, and dispersive liquid-liquid microextraction.
  • Evaluation of solid-phase extraction (SPE) for batch and flow detection, including online connection to atomic spectrometric detectors.
  • Review of sorbent materials for SPE: chelating resins, nanomaterials, imprinted materials, and bio-sorbents.
  • Inclusion of other techniques like hydride generation and coprecipitation.

Main Results:

  • Non-chromatographic methods offer efficient alternatives for trace element speciation.
  • Solid-phase extraction, particularly when coupled with atomic spectrometry, shows significant promise.
  • Diverse sorbent materials enhance the selectivity and efficiency of SPE.
  • Hydride generation and coprecipitation are valuable complementary techniques.

Conclusions:

  • Non-chromatographic methods provide effective strategies for trace element speciation in geological, environmental, biological, and medical fields.
  • The choice of method and sorbent material depends on the specific application and matrix.
  • Further development in these techniques can lead to more sensitive and rapid speciation analysis.