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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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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 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.
 Solutions containing organic solvents, such as low-molecular-mass alcohols, esters, or ketones, enhance absorbances by increasing...
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Atomic Emission Spectroscopy: Lab01:29

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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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Precipitation and Co-precipitation01:17

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Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
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Microorganisms play a critical role in the transformation and immobilization of uranium in contaminated environments through four main pathways: bioreduction, biosorption, bioaccumulation, and biomineralization. These mechanisms reduce uranium’s toxicity and prevent its migration through groundwater systems, offering sustainable approaches for in situ bioremediation.Bioreduction of UraniumBioreduction is driven by anaerobic bacteria such as certain strains of Geobacter and Shewanella,...
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Updated: May 6, 2026

Separation of Uranium and Thorium for 230Th-U Dating of Submarine Hydrothermal Sulfides
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Uranium and thorium sequential separation from norm samples by using a SIA system.

M Mola1, A Nieto, A Peñalver

  • 1Universitat Rovira i Virgili, Marcel·lí Domingo s/n, 43007 Tarragona, Spain; Unitat de Radioquímica Ambiental i Sanitària (URAIS), Consorci d'Aigües de Tarragona (CAT), Ctra Nacional 340, km 1094, 43895 L'Ampolla, Spain.

Journal of Environmental Radioactivity
|November 1, 2013
PubMed
Summary
This summary is machine-generated.

A new sequential radiochemical separation method using Sequential Injection Analysis (SIA) and UTEVA resin improves uranium and thorium recovery. This automated approach offers faster, more efficient analysis of Naturally Occurring Radioactive Material (NORM) samples.

Keywords:
Alpha-particle spectrometryNaturally occurring radioactive materialSequential injection analysisUTEVA resin

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Area of Science:

  • Radiochemistry
  • Analytical Chemistry
  • Environmental Science

Background:

  • Naturally Occurring Radioactive Material (NORM) analysis is crucial for environmental monitoring.
  • Traditional radiochemical separation methods can be time-consuming and labor-intensive.
  • Accurate quantification of uranium and thorium isotopes is essential for risk assessment.

Purpose of the Study:

  • To develop and validate a novel sequential radiochemical separation method for uranium and thorium isotopes.
  • To implement a Sequential Injection Analysis (SIA) system for automated sample processing.
  • To compare the efficiency and accuracy of the new method against classical techniques.

Main Methods:

  • Sequential Injection Analysis (SIA) system coupled with UTEVA extraction chromatographic resin.
  • Alpha-particle spectrometry for the quantification of uranium and thorium isotopes.
  • Analysis of IAEA intercomparison samples, drinking water treatment plant sludge, and factory sediment samples.

Main Results:

  • The developed SIA method demonstrated higher recovery rates for uranium (93%) and thorium (70%) compared to the classical method (82% for U, 60% for Th).
  • Successful application to diverse NORM samples, including sludge and sediment.
  • Validation against IAEA standards confirmed method reliability.

Conclusions:

  • The novel SIA-based radiochemical separation method is a viable and advantageous alternative to classical techniques.
  • The method offers reduced sample handling, lower solvent consumption, and significantly decreased analysis time.
  • This automated strategy enhances the efficiency and accuracy of uranium and thorium isotope determination in NORM samples.