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Related Concept Videos

Sampling Methods: Sample Types01:18

Sampling Methods: Sample Types

Sampling materials are classified into three main types: solid, liquid, and gas.
Solid samples include a variety of substances, such as sediments from water bodies, soil, metals, and biological tissues. Two standard methods for extracting sediments from water bodies are grab sampling and piston coring. Grab sampling involves using a device to collect a discrete sediment sample from the bottom of a water body with minimal disturbance. Grab samples do not always represent the entire area due to...

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Low-Cost Automated Flight Intercept Trap for the Temporal Sub-Sampling of Flying Insects Attracted to Artificial Light at Night
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Development and application of a needle trap device for time-weighted average diffusive sampling.

Ying Gong1, In-Yong Eom, Da-Wei Lou

  • 1Department of Chemistry, University of Waterloo, Waterloo, Ontario, N2L 3G1 Canada.

Analytical Chemistry
|September 4, 2008
PubMed
Summary
This summary is machine-generated.

A new, affordable method uses needle trap devices (NTDs) for time-weighted average air sampling of volatile organic compounds (VOCs). This validated technique offers accurate analysis of benzene, toluene, ethylbenzene, and o-xylene (BTEX) for industrial hygiene.

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Area of Science:

  • Analytical Chemistry
  • Environmental Science
  • Occupational Health

Background:

  • Volatile organic compounds (VOCs) pose risks in industrial settings.
  • Accurate air monitoring is crucial for occupational safety.
  • Existing methods for VOC analysis can be complex and costly.

Purpose of the Study:

  • To develop and validate a simple, cost-effective method for VOC analysis.
  • To assess the efficacy of needle trap devices (NTDs) for time-weighted average (TWA) diffusive sampling.
  • To analyze benzene, toluene, ethylbenzene, and o-xylene (BTEX) in air samples.

Main Methods:

  • Solventless extraction combined with thermal desorption and VOC determination.
  • Utilized NTDs packed with Carboxen1000 as passive diffusive samplers.
  • Applied derivations of Fick's first law to model TWA sampling under various conditions.

Main Results:

  • The NTD method demonstrated effectiveness for BTEX analysis.
  • Carboxen1000 showed excellent adsorption/desorption properties.
  • Good agreement was observed between theoretical and experimental sampling rates.
  • Method validation against established techniques showed comparable results.

Conclusions:

  • The developed NTD method is a simple, cost-effective, and reliable tool for BTEX air monitoring.
  • The technique is suitable for industrial hygiene applications due to its accuracy and ease of use.
  • Automated sample introduction enhances its utility for routine analysis.