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Sampling Plans

Sampling Plans

Sampling is a crucial step in analytical chemistry, allowing researchers to collect representative data from a large population. Common sampling methods include random, judgmental, systematic, stratified, and cluster sampling.
Random sampling is a method where each member of the population has an equal chance of being selected for the sample. It involves selecting individuals randomly, often using random number generators or lottery-type methods. For example, when analyzing the properties of a...

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Collection and Extraction of Occupational Air Samples for Analysis of Fungal DNA

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A new approach for diffusive sampling based on SPME for occupational exposure assessment.

P Marín¹, J F Periago, C Prado

¹Departamento de Ciencias Sociosanitarias, Universidad de Murcia, Facultad de Medicina, Murcia, Spain.

Journal of Occupational and Environmental Hygiene

|January 30, 2013

Summary

This study introduces a new solid-phase microextraction (SPME) passive sampler for measuring volatile organic compounds (VOCs). The SPME device accurately reflects average exposure concentrations, showing promise for occupational health monitoring.

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Last Updated: May 14, 2026

Collection and Extraction of Occupational Air Samples for Analysis of Fungal DNA

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Published on: May 2, 2018

Sampling and Analysis of Animal Scent Signals

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Effective Analysis of Human Exposure Conditions with Body-worn Dosimeters in the 2.4 GHz Band

Effective Analysis of Human Exposure Conditions with Body-worn Dosimeters in the 2.4 GHz Band

Published on: May 2, 2018

Area of Science:

Environmental Science
Analytical Chemistry
Occupational Health

Background:

Passive sampling is crucial for evaluating environmental volatile organic compound (VOC) exposures.
Solid-phase microextraction (SPME) is a reliable technique for air sampling and is being adapted for passive sampling.
Assessing time-weighted average exposure to VOCs requires effective passive sampling methods.

Purpose of the Study:

To evaluate the performance of a novel SPME-based passive sampler for diffusive monitoring of VOCs.
To determine the uptake rates and assess the reliability of the SPME passive sampler for toluene and chlorobenzene.
To investigate the influence of various environmental factors on sampler performance.

Main Methods:

A cylindrical diffusion cell with a carboxen/polydimethylsiloxane fiber was used as the SPME passive sampler.
Experimental uptake rates were determined for toluene and chlorobenzene in standard atmospheres.
Sampler behavior was tested under varying concentrations, environmental conditions, and in real-world settings like gas stations.

Main Results:

The mean diffusive uptake rates were 2.14 mL/min for toluene and 2.57 mL/min for chlorobenzene.
No significant effects of concentration or sampling time were observed for toluene and chlorobenzene within the studied ranges.
The SPME sampler accurately reflected average exposure concentrations and showed comparable results to a commercial diffusive sampler.

Conclusions:

The developed SPME passive sampler demonstrates reliable performance for the diffusive monitoring of VOCs.
This SPME device shows significant potential for occupational exposure assessment.
Further studies on environmental factors confirm the sampler's robustness for real-world applications.