Precision of PM measurements with the UNC passive aerosol sampler
نویسندگان
چکیده
منابع مشابه
Improving the UNC Passive Aerosol Sampler Model Based on Comparison with Commonly Used Aerosol Sampling Methods
Objectives In an occupational environment, passive sampling could be an alternative to active sampling with pumps for sampling of dust. One passive sampler is the University of North Carolina passive aerosol sampler (UNC sampler). It is often analysed by microscopic imaging. Promising results have been shown for particles above 2.5 µm, but indicate large underestimations for PM2.5. The aim of t...
متن کاملThe pre-impinger, a selective aerosol sampler.
When airborne particles are inhaled it is known that most of those of effective diameter greater than about 5 ,u are filtered out by the upper respiratory tract. Current knowledge of this subject as reviewed by Davies (1949, 1952) indicates that the size of particle which has a 50% chance of passing through the upper respiratory tract lies somewhere in the range 312t to 5 t±. Toxic effects from...
متن کاملComparison of a passive aerosol sampler to size-selective pump samplers in indoor environments.
The objective of this work was to investigate the ability of the Wagner-Leith passive aerosol sampler to measure indoor exposures over periods of 24 hours to 2 weeks. An automated analysis technique was developed so that lower aerosol concentrations could be sampled over shorter time periods. A test of the new analytical method against a manual method showed good agreement. The passive sampler ...
متن کاملAerosol extinction-to-backscatter ratio derived from passive satellite measurements
Spaceborne reflectance measurements from the POLDER instrument are used to study the specific directional signature close to the backscatter direction. The data analysis makes it possible to derive the extinction-tobackscatter ratio (EBR), which is related to the inverse of the scattering phase function for an angle of 180 and is needed for a quantitative interpretation of lidar observations (a...
متن کاملInfluence of sampler configuration on the uptake kinetics of a passive air sampler.
Passive air samplers (PAS) are simple and cost-effective tools to monitor semivolatile organic compounds in air. Chemical uptake occurs by molecular diffusion from ambient air to a passive sampling medium (PSM). Previous calibration studies indicate that even for the same type of PAS, passive air sampling rates (R, m(3)(air)/d) can be highly variable due to the influence of a number of factors....
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Aerosol Science
سال: 2013
ISSN: 0021-8502
DOI: 10.1016/j.jaerosci.2012.09.001