Particle Deagglomeration and Reentrainment in a PM-10 Sampler

Autor:	Wolfgang Winklmayr, Walter John, Hwa-Chi Wang
Rok vydání:	1991
Předmět:	Meteorology Chemistry Aerosol impaction Impaction fungi Airflow Sampling (statistics) Soil science complex mixtures Pollution Aerosol Environmental Chemistry Mass concentration (chemistry) Particle General Materials Science Wind tunnel
Zdroj:	Aerosol Science and Technology. 14:165-176
ISSN:	1521-7388 0278-6826
DOI:	10.1080/02786829108959480
Popis:	Field tests have revealed large differences in the sampling efficiencies among PM-10 samplers that previously satisfied EPA performance requirements in wind tunnel testing. To investigate causes due to processes internal to the samplers, a laboratory method was used, based on the introduction of aerosol to the sampler in a manner that approximates ambient sampling. Reentrainment of deposited particles in a dry sampler from air flow alone is found to be negligible, but it is found that particle bombardment can produce significant reentrainment. The main cause of oversampling in the Sierra-Andersen sampler is identified to be the deagglomeration of large soil particles on the impaction surface. Optical counter measurements with soil aerosol show that the mass concentration of particles smaller than 10 μm is 1.6 times greater below the impaction plate than above. Oiling the impaction plate reduces the ratio to 1.1.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::85097dd5c0235cdf728339f1121207dd https://doi.org/10.1080/02786829108959480 Zobrazit plný text záznamu