Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Behavior of Gas Molecules: Molecular Diffusion, Mean Free Path, and Effusion

Behavior of Gas Molecules: Molecular Diffusion, Mean Free Path, and Effusion

Although gaseous molecules travel at tremendous speeds (hundreds of meters per second), they collide with other gaseous molecules and travel in many different directions before reaching the desired target. At room temperature, a gaseous molecule will experience billions of collisions per second. The mean free path is the average distance a molecule travels between collisions. The mean free path increases with decreasing pressure; in general, the mean free path for a gaseous molecule will be...

Diffusion on Chromatography Columns

Diffusion on Chromatography Columns

In column chromatography, when an analyte is introduced as a narrow band at the top of the column, the solutes begin to separate and broaden, developing a Gaussian profile. This broadening occurs due to various factors, such as longitudinal diffusion.
Longitudinal diffusion occurs when the solute molecules in the mobile phase diffuse from the more concentrated center of the chromatographic band to the more dilute regions on either side, both towards and against the flow direction. This...

Passive Diffusion: Overview and Kinetics

Passive Diffusion: Overview and Kinetics

Passive diffusion is a critical process that allows small lipophilic drugs to cross the cell membrane along a concentration gradient. This mechanism's efficiency depends on four primary factors: the membrane's surface area, the drug's lipid-water partition coefficient, the concentration gradient, and the membrane's thickness.
When administered orally, drugs establish a substantial concentration gradient between the gastrointestinal (GI) lumen and the bloodstream, expediting their diffusion into...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

Data of the Insect Biome Atlas: a metabarcoding survey of the terrestrial arthropods of Sweden and Madagascar.

Scientific data·2025

Same author

Evaluation of prophylactic therapy in haemophilia with global coagulation tests.

Haemophilia : the official journal of the World Federation of Hemophilia·2017

Same author

Antimicrobial use and antimicrobial susceptibility in <i>Escherichia coli</i> on small- and medium-scale pig farms in north-eastern Thailand.

Antimicrobial resistance and infection control·2017

Same author

Merging Features from Green's Functions and Time Dependent Density Functional Theory: A Route to the Description of Correlated Materials out of Equilibrium?

Physical review letters·2016

Same author

Three-dimensional dynamics of a fermionic Mott wedding-cake in clean and disordered optical lattices.

Scientific reports·2013

Same author

Analysis of toxic effluents released from PVC carpet under different fire conditions.

Chemosphere·2012

Same journal

In vitro assessment of the bioaccessibility of brominated flame retardants in indoor dust using a colon extended model of the human gastrointestinal tract.

Journal of environmental monitoring : JEM·2012

Same journal

Sampling of herbicides in streams during flood events.

Journal of environmental monitoring : JEM·2012

Same journal

Field-deployable and near-real-time optical microfluidic biosensors for single-oocyst-level detection of Cryptosporidium parvum from field water samples.

Journal of environmental monitoring : JEM·2012

Same journal

Sampling, extraction and measurement of bacteria, endotoxin, fungi and inflammatory potential of settling indoor dust.

Journal of environmental monitoring : JEM·2012

Same journal

Temporal trends of mercury in Greenland ringed seal populations in a warming climate.

Journal of environmental monitoring : JEM·2012

Same journal

Nonlinearity in the relationship between bone lead concentrations and CBLI for lead smelter employees.

Journal of environmental monitoring : JEM·2012

See all related articles

Search research articles

Related Experiment Video

Updated: Jul 5, 2026

Automated, High-resolution Mobile Collection System for the Nitrogen Isotopic Analysis of NOx

Automated, High-resolution Mobile Collection System for the Nitrogen Isotopic Analysis of NO_x

Published on: December 20, 2016

Validation of a diffusive sampler for NO2.

A Hagenbjörk-Gustafsson¹, R Lindahl, J O Levin

¹National Institute for Working Life, Department of Chemistry, P.O. Box 7654, S-907 13 Umeå, Sweden.

Journal of Environmental Monitoring : JEM

|September 1, 2001

Summary

This summary is machine-generated.

The Willems badge effectively measures nitrogen dioxide (NO2) using a validated colorimetric method. This diffusive sampler demonstrates high capacity and accuracy, suitable for both environmental and personal NO2 monitoring.

More Related Videos

Estimating Sediment Denitrification Rates Using Cores and N2O Microsensors

Estimating Sediment Denitrification Rates Using Cores and N₂O Microsensors

Published on: December 6, 2018

Measuring Sub-23 Nanometer Real Driving Particle Number Emissions Using the Portable DownToTen Sampling System

Measuring Sub-23 Nanometer Real Driving Particle Number Emissions Using the Portable DownToTen Sampling System

Published on: May 22, 2020

Related Experiment Videos

Last Updated: Jul 5, 2026

Automated, High-resolution Mobile Collection System for the Nitrogen Isotopic Analysis of NOx

Automated, High-resolution Mobile Collection System for the Nitrogen Isotopic Analysis of NO_x

Published on: December 20, 2016

Estimating Sediment Denitrification Rates Using Cores and N2O Microsensors

Estimating Sediment Denitrification Rates Using Cores and N₂O Microsensors

Published on: December 6, 2018

Measuring Sub-23 Nanometer Real Driving Particle Number Emissions Using the Portable DownToTen Sampling System

Measuring Sub-23 Nanometer Real Driving Particle Number Emissions Using the Portable DownToTen Sampling System

Published on: May 22, 2020

Area of Science:

Environmental Science
Analytical Chemistry
Occupational Health

Background:

Nitrogen dioxide (NO2) is a significant air pollutant with adverse health effects.
Accurate and reliable NO2 monitoring is crucial for environmental and occupational health assessments.
Existing NO2 sampling methods may have limitations in terms of capacity, sensitivity, or ease of use.

Purpose of the Study:

To validate the performance of the Willems badge, a diffusive sampler for NO2.
To assess the sampler's reliability in laboratory and field conditions.
To determine the suitability of the Willems badge for various NO2 monitoring applications.

Main Methods:

Validation of the Willems badge using laboratory experiments and field tests.
Utilizing triethanolamine as the collecting reagent for NO2.
Analysis based on a modified Saltzman colorimetric method with flow injection analysis (FIA).

Main Results:

The sampling rate was determined to be 40.0 ml min-1, unaffected by NO2 concentration or relative humidity.
A low detection limit of 4 µg m-3 for a 24 h sample was achieved.
The sampler exhibited high capacity, allowing for 7-day sampling of 150 µg m-3, and performed well in field tests under various conditions (wind, low temperature).
Overall method uncertainty was determined to be 24%.

Conclusions:

The Willems badge is a validated and reliable diffusive sampler for NO2.
Its high sensitivity, capacity, and performance in diverse conditions make it suitable for environmental monitoring.
The sampler is also effective for personal NO2 monitoring in occupational settings for 2-8 hour periods.