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Related Concept Videos

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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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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X-ray diffraction or XRD is an analytical tool that utilizes X-rays to study ordered structures such as crystalline organic and inorganic samples, polycrystalline materials, proteins, carbohydrates, and drugs.
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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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Mass spectrometry is an important technique for the identification of pure compounds. However, it has some limitations for the analysis of complex mixtures, often due to excessive fragmentation making the spectrum too complicated to decipher. Mass spectrometry can be combined with suitable separation methods in sequence, forming hyphenated methods, which are useful in the analysis of complex mixtures.
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Updated: Apr 5, 2026

In Situ Detection and Single Cell Quantification of Metal Oxide Nanoparticles Using Nuclear Microprobe Analysis
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Particle Analysis in Forensic Science.

R E Bisbing1, W M Schneck2,3

  • 1McCrone Associates, Inc., Westmont, IL, USA.

Forensic Science Review
|August 7, 2015
PubMed
Summary
This summary is machine-generated.

Microscopic trace evidence, from diverse sources like soil and explosives, is analyzed using microscopy and chemical methods. Its value in forensic science relies on particle characteristics and context.

Keywords:
Biologicalsbuilding materialscannabiscosmeticsdiatomsexplosivesfeathersfoodstuffsforensicgunshot residueslichenmetalsmicroanalysismicroscopymineralsmossespaper productsparticlesphytolithspleavespolarized light microscopypollenscanning electron microscopyseedsskin particlessporeswood pulp

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Area of Science:

  • Forensic Science
  • Analytical Chemistry
  • Materials Science

Background:

  • Microscopic trace evidence encompasses a wide array of particulate matter.
  • Sources include biologicals, soil, construction materials, metals, explosives, gunshot residues, and cosmetics.
  • The forensic significance of these particles is well-established.

Purpose of the Study:

  • To outline the identification and confirmation processes for microscopic trace evidence.
  • To discuss the factors influencing the probative value of forensic particles.

Main Methods:

  • Morphological analysis using microscopy.
  • Chemical analysis for elemental and molecular composition.
  • Comparison with reference materials and known samples for identification confirmation.

Main Results:

  • Particles from various sources can be identified and characterized.
  • Confirmation of particle identity is achieved through comparative analysis.
  • The probative value is contingent upon the particle's nature and its contextual presence.

Conclusions:

  • Comprehensive analysis enables the identification of diverse microscopic trace evidence.
  • Comparative analysis is crucial for confirming the identity of forensic particles.
  • The interpretation of trace evidence in forensic investigations requires consideration of its characteristics and circumstances.