Determination of uptake rate of sensitive diffusion sampler for formaldehyde in air

Formaldehyde (HCHO) is a major indoor air pollutant. Authors have developed a sensitive diffusion sampler of gaseous HCHO in air at ppb level for 30 min exposure. An uptake rate of the sampler was determined by a small chamber experiment and theoretically evaluated by a dynamic sorption model based on Langmuir theory. Field tests proved successful use of the sampler in living environment.