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Related Concept Videos

Atomic Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

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.
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 Emission Spectroscopy: Overview01:20

Atomic Emission Spectroscopy: Overview

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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Related Experiment Video

Updated: Jun 8, 2026

Development of a Nose-only Inhalation Toxicity Test Chamber That Provides Four Exposure Concentrations of Nano-sized Particles
05:07

Development of a Nose-only Inhalation Toxicity Test Chamber That Provides Four Exposure Concentrations of Nano-sized Particles

Published on: March 18, 2019

New developments in aerosol dosimetry.

Robert F Phalen1, Loyda B Mendez, Michael J Oldham

  • 1Department of Medicine, University of California, Irvine, CA 92697-1825, USA. rfphalen@uci.edu

Inhalation Toxicology
|October 14, 2010
PubMed
Summary
This summary is machine-generated.

Particle dosimetry research reveals new insights into how inhaled particles behave in the body. Ultrafine particles, body size, and diseases significantly impact particle deposition, translocation, and clearance, challenging existing models.

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Development of a Nose-only Inhalation Toxicity Test Chamber That Provides Four Exposure Concentrations of Nano-sized Particles
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Area of Science:

  • Environmental Health Sciences
  • Toxicology
  • Inhalation Science

Background:

  • Dosimetry links environmental exposures to particle deposition, translocation, and removal within the body.
  • It is crucial for extrapolating animal and in vitro data to human health risk assessments.
  • Recent advancements have refined our understanding of particle behavior and dose determination.

Purpose of the Study:

  • To review recent progress in particle dosimetry.
  • To highlight key factors influencing inhaled particle doses and fates.
  • To discuss emerging concepts in particle translocation and clearance.

Main Methods:

  • Literature review of recent advancements in particle dosimetry.
  • Analysis of factors affecting particle deposition and translocation.
  • Examination of dosimetric considerations related to particle properties and physiological variations.

Main Results:

  • Ultrafine particle size is a critical dosimetric characteristic.
  • Age, gender, body size, and lung diseases (e.g., COPD) significantly influence inhaled particle doses and distribution.
  • Particles can translocate to the brain via olfactory nerves and other organs; clearance rates can be slow even in healthy lungs.
  • Particle deposition hot spots exist, leading to localized high doses in the respiratory tract.

Conclusions:

  • New dosimetry insights challenge traditional concepts of particle translocation and clearance.
  • Particle count, composition, and surface properties are important toxicological considerations.
  • Understanding these factors is vital for accurate human health risk assessment from environmental exposures.