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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...
Gas Chromatography: Sample Injection Systems01:08

Gas Chromatography: Sample Injection Systems

In gas chromatography, the sample is introduced as a vapor plug into the carrier gas stream for high efficiency and resolution. A microsyringe injects the sample solution into a heated sample port, vaporizing it and mixing it with the carrier gas. This process is important to ensure the sample is properly prepared for analysis. Thermally sensitive samples can be injected directly into the column and volatilized by slowly increasing the column temperature.
Two primary injection methods are used...

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Collection and Extraction of Occupational Air Samples for Analysis of Fungal DNA
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A flow-through sampler for semivolatile organic compounds in air.

Hang Xiao1, Hayley Hung, Tom Harner

  • 1Department of Chemical Engineering and Applied Chemistry, University of Toronto at Scarborough, 1265 Military Trail, Toronto, Ontario, Canada MIC 1A4.

Environmental Science & Technology
|February 3, 2007
PubMed
Summary

A novel flow-through air sampler significantly increases sampling rates for semivolatile organic chemicals. This design improves temporal resolution for monitoring air pollutants like PCBs and PAHs.

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Area of Science:

  • Environmental Science
  • Analytical Chemistry
  • Air Quality Monitoring

Background:

  • Passive air sampling for semivolatile organic chemicals (SVOCs) has low sampling rates, limiting temporal resolution.
  • Existing methods struggle to capture rapid changes in air pollutant concentrations.
  • There is a need for improved sampling designs that offer faster uptake and quantitative data.

Purpose of the Study:

  • To develop and evaluate a novel passive air sampler with significantly increased sampling rates.
  • To enable higher temporal resolution monitoring of SVOCs in ambient air.
  • To provide a reliable method for quantitative air concentration measurements.

Main Methods:

  • A flow-through sampler design was developed, utilizing a wind-driven, aerodynamically shaped tube with polyurethane foam (PUF) discs.
  • Wind speed was measured using calibrated anemometers to calculate sampled air volume.
  • Laboratory experiments and frontal chromatography theory were used to determine performance metrics like breakthrough volumes for target compounds.

Main Results:

  • The new sampler achieves greatly increased sampling rates, collecting up to 100 m³/day under typical wind conditions.
  • Performance was validated for polychlorinated biphenyls (PCBs) and polycyclic aromatic hydrocarbons (PAHs) using PUF plugs.
  • Corrected air concentrations obtained with the flow-through sampler showed favorable comparison with conventional high-volume samplers.

Conclusions:

  • The developed flow-through sampler design overcomes the limitations of traditional passive samplers by enhancing sampling rates.
  • This innovation allows for improved temporal resolution in air quality monitoring for SVOCs.
  • The sampler provides quantitative and reliable data, comparable to established high-volume sampling methods.