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Atomic Emission Spectroscopy: Overview01:20

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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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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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A scanning electron microscope (SEM) is used to study the surface features of a sample by using an electron beam that scans the sample surface in a two-dimensional manner. Typically, areas between ~1 centimeter to 5 micrometers in width can be imaged. SEM can be used to image bacteria, viruses, tissues as well as larger samples like insects. Conventional SEM gives a magnification ranging from 20X to 30,000X and spatial resolution of 50 to 100 nanometers.
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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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Elemental distribution patterns in rock samples from Egypt using neutron activation and complementary X-ray

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Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine
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This study analyzed felsite rock composition using INAA and XRF, revealing high silicon and low gold levels. Elemental variations suggest diverse origins and highlight Egypt

Keywords:
EgyptINAA and XRFMajor and trace elementsMultivariate statisticsUm SafiWadi Siwiqat Um Lassaf area

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Area of Science:

  • Geochemistry
  • Mineralogy
  • Analytical Chemistry

Background:

  • Felsite (rhyolite) rocks are crucial for understanding geological processes.
  • Elemental composition analysis provides insights into rock origin and economic potential.

Purpose of the Study:

  • To determine the elemental composition of felsite rocks using advanced analytical techniques.
  • To characterize the rocks and ascertain their geological origin through statistical analysis.
  • To compare the elemental profile with the upper continental crust (UCC).

Main Methods:

  • Instrumental Neutron Activation Analysis (INAA) for elemental quantification.
  • X-ray Fluorescence (XRF) for elemental composition analysis.
  • Bivariate and multivariate statistical analyses for rock characterization and origin determination.

Main Results:

  • Significantly high silicon (297000 ± 4000 mg/kg) and low gold (0.10 ± 0.01 mg/kg) levels were detected.
  • Dominant elements ranked: Silicon > Aluminum > Potassium > Sodium > Zirconium > Calcium > Zinc > Manganese.
  • Elevated levels of uranium and thorium were identified, with variations indicating heterogeneity and diverse origins.

Conclusions:

  • The elemental data provide valuable baseline information for the studied area in Egypt.
  • Observed elemental variations suggest heterogeneity and multiple origins for the felsite rocks.
  • The findings underscore the economic significance of the area and demonstrate effective integration of analytical methods.