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Related Concept Videos

Sampling Plans01:23

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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Polychlorinated naphthalenes in the Global Atmospheric Passive sampling (GAPS) study.

Sum Chi Lee1, Tom Harner, Karla Pozo

  • 1Science and Technology Branch, Environment Canada, 4905 Dufferin Street, Toronto, Ontario M3H 5T4, Canada.

Environmental Science & Technology
|May 31, 2007
PubMed
Summary

Polychlorinated naphthalenes (PCNs) are globally widespread in air, with highest levels found in urban areas. Combustion sources increasingly contribute to current PCN air pollution.

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Area of Science:

  • Environmental Chemistry
  • Atmospheric Science
  • Pollutant Analysis

Background:

  • Polychlorinated naphthalenes (PCNs) are persistent organic pollutants.
  • Understanding their global distribution is crucial for environmental risk assessment.

Purpose of the Study:

  • To assess the global spatial distribution of air concentrations of PCNs.
  • To identify sources contributing to contemporary PCN air burden.

Main Methods:

  • Air samples were collected from over 40 sites worldwide using passive sampling.
  • Congener composition was analyzed to differentiate sources.

Main Results:

  • PCNs were detected globally, with elevated levels in urban/industrial locations.
  • Geometric mean air concentration of sigmaPCN was 1.6 pg/m3.
  • Combustion-related congeners were enriched, indicating current combustion sources.

Conclusions:

  • PCNs are ubiquitous in the atmosphere.
  • Combustion processes are an increasingly significant source of global PCN air pollution.
  • Source contributions vary geographically.