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Related Concept Videos

Sampling Methods: Sample Types01:18

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Sampling materials are classified into three main types: solid, liquid, and gas.
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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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Related Experiment Video

Updated: Feb 17, 2026

Fast and Accurate Exhaled Breath Ammonia Measurement
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Air sampling unit for breath analyzers.

Dariusz Szabra1, Artur Prokopiuk1, Janusz Mikołajczyk1

  • 1Institute of Optoelectronics, Military University of Technology, 2 Kaliskiego St., 00-908 Warsaw, Poland.

The Review of Scientific Instruments
|December 3, 2017
PubMed
Summary
This summary is machine-generated.

A new portable breath sampling unit (BSU) efficiently separates exhaled air phases for clinical analysis. This device enhances breath analysis by collecting specific breath phases, improving diagnostic accuracy for respiratory conditions.

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Area of Science:

  • Biomedical Engineering
  • Respiratory Physiology
  • Analytical Chemistry

Background:

  • Accurate analysis of exhaled breath is crucial for diagnosing respiratory diseases.
  • Existing breath analysis methods often lack efficient phase separation capabilities.
  • A need exists for a versatile and portable device to collect specific breath phases.

Purpose of the Study:

  • To develop and validate a portable breath sampling unit (BSU) for analyzing human breath.
  • To enable the separation and collection of distinct exhaled air phases (I, II, III) for clinical and research applications.
  • To serve as a patient interface device for various breath analyzers.

Main Methods:

  • The BSU was designed to measure exhaled CO2 (ECO2) for phase identification.
  • It operates in on-line and off-line modes, adhering to ATS/ERS standards.
  • A 5 dm3 Tedlar bag collects 1-25 breath phases; LED indicators guide operation.
  • Preliminary verification involved gas chromatography/mass spectrometry (GC/MS) analysis of volatile organic compounds.

Main Results:

  • The BSU successfully collected selected breath phases, enabling monitoring of airflow from upper and lower airways.
  • Preliminary GC/MS tests showed a ~40% signal increase for the III phase in exhaled nitric oxide and isoprene analyses.
  • The device demonstrated functionality in distinguishing and collecting specific breath phases.

Conclusions:

  • A prototype of an efficient, portable breath sampling unit for breath analyzers has been successfully constructed.
  • The developed BSU can effectively probe upper airway and alveolar air for clinical and scientific studies.
  • This technology holds promise for advancing non-invasive respiratory diagnostics and research.