Cellulose filter high-volume cascade impactor aerosol collection efficiency. A technical note

1978 ◽  
Vol 12 (13) ◽  
pp. 1435-1437 ◽  
Author(s):  
Herman Sievering ◽  
Mehul J. Dave ◽  
Patric G. McCoy ◽  
Keith Walther
Keyword(s):  
Collection Efficiency ◽  
High Volume ◽  
Cascade Impactor ◽  
Technical Note ◽  
Cellulose Filter

Field and laboratory tests of a high volume cascade impactor

2003 ◽  
Vol 34 (4) ◽  
pp. 485-500 ◽  
Author(s):  
Markus Sillanpää ◽  
Risto Hillamo ◽  
Timo Mäkelä ◽  
Arto S Pennanen ◽  
Raimo O Salonen
Keyword(s):  
Laboratory Tests ◽  
High Volume ◽  
Cascade Impactor

81. Collection Efficiency of the High Volume Small Surface Sampler on Worn Carpets

2002 ◽  
Author(s):  
E. Svendsen ◽  
P. Thorne ◽  
P. O'Shaughnessy ◽  
A. Quinones ◽  
D. Zimmerman ◽  
...  
Keyword(s):  
Collection Efficiency ◽  
High Volume ◽  
Small Surface ◽  
Surface Sampler

Assessment on the Collection Efficiency of an Aerosol Sampler in Micro and Nanoparticles Environment

2014 ◽  
Vol 609-610 ◽  
pp. 483-488 ◽  
Author(s):  
Yi Yang ◽  
Ping Mao ◽  
Shu Yan Feng ◽  
Jin Hua Zhang
Keyword(s):  
Collection Efficiency ◽  
Cascade Impactor ◽  
Test Results ◽  
Simple Method ◽  
Workplace Environment ◽  
Aerosol Nanoparticles ◽  
Micrometer Particle ◽  
In Series ◽  
Order Of Magnitude ◽  
Assessment Result

The collection efficiency (CE) of an aerosol sampler is usually assessed dependently by using a sampler with higher CE and higher sampling accuracy or comparing the grain size distribution, concentration and/or other characteristics of the collected dust to that of the original dust, instead of the sampler itself. To establish a simple method for the assessment on the collection efficiency (CE) of an aerosol sampler, a self-dependent method was derived to calculate the CE of an aerosol sampler, which was patented with the number of ZL200910233001.X by the State Intellectual Property Office of China. According to the patent method, two or more uniform aerosol samplers of the same model were connected in series the inlet of a sampler was connected directly with the outlet of another sampler. The CE (η) of the aerosol sampler can be calculated by a simple equation as:η=1-m2/m1, in whichm1andm2is the weight of the aerosol particles collected by sampler 1# and sampler 2# in the connection sequence, respectively. A cascade impactor sampler was used to sample in a micrometer particle (d50=2.5 μm) aerosol environment and a nanoparticle (d50=42 nm) aerosol environment which were formed artificially in a glove box, as well as a workplace environment which manufactured nanometer powders. The sampling test results indicated that the cascade impactor sampler showed relative high CE (99.51%) for micrometer aerosol but a little bit low CE (95.2%) for nanoparticle aerosol. However, a low CE (93.93%) was calculated out by the method because of low concentration aerosol nanoparticles in the workplace environment, which result to big testing errors. It was found that the assessment result on collection efficiency of a sampler is highly affected by the subsequent analytical methods and detection accuracies after the sampling process. If the precision of the electronic balance was improved to a reasonable higher order of magnitude, the cascade impactor sampler can hopefully show much higher collection efficiency on nanoparticle aerosols.

Characterisation and source identification of PM10 aerosol samples collected with a high volume cascade impactor in Brisbane (Australia)

2000 ◽  
Vol 262 (1-2) ◽  
pp. 5-19 ◽  
Author(s):  
Y.C. Chan ◽  
P.D. Vowles ◽  
G.H. McTainsh ◽  
R.W. Simpson ◽  
D.D. Cohen ◽  
...  
Keyword(s):  
Source Identification ◽  
High Volume ◽  
Cascade Impactor

scholarly journals Design and Calibration of A High Volume Cascade Impactor

1973 ◽  
Vol 23 (9) ◽  
pp. 778-782 ◽  
Author(s):  
R. A. Gussman ◽  
A. M. Sacco ◽  
N. M. McMahon
Keyword(s):  
High Volume ◽  
Cascade Impactor

The Deposition of Airborne Droplets on dead House-flies (Musca domestica L.)

1959 ◽  
Vol 50 (2) ◽  
pp. 327-332 ◽  
Author(s):  
R. T. Jarman
Keyword(s):  
Musca Domestica ◽  
Collection Efficiency ◽  
Theoretical Calculations ◽  
Droplet Diameter ◽  
Cascade Impactor ◽  
House Fly ◽  
Cross Sectional ◽  
House Flies ◽  
Collecting Efficiency ◽  
Filtering Effect

An experimental laboratory study of the deposition of droplets on dead house-flies (Musca domestica L.) was made, using a spinning-top sprayer to produce a spray of uniformly sized oil droplets and a cascade impactor to measure the concentration of the spray of droplets, which were dyed. The deposits obtained on a dead house-fly and a cascade-impactor slide when these were exposed in turn to a wind of 1 m. per sec. in a wind tunnel were compared colorimetrically, and determinations thus made of the collection efficiency of the flies, defined as the volume of liquid deposited on an object expressed as a percentage of the volume that would have passed through the same cross-section as the object had that not been there.The measured collecting efficiency of a fly varied from about 70 per cent. (droplet dia. 27μ) to about 200 per cent. (droplet dia. 75μ), and was approximately twice that of a sphere with a cross-sectional area twice the projected frontal area of the fly. From theoretical calculations of the filtering effect of different elements of the vegetation, it is concluded that the optimum droplet diameter for deposition on flies in woodland is 20–40μ.

scholarly journals Comparison of three air samplers for the collection of four nebulized respiratory viruses

2020 ◽  
Author(s):  
Jasmin S Kutter ◽  
Dennis de Meulder ◽  
Theo M Bestebroer ◽  
Ard Mulders ◽  
Ron AM Fouchier ◽  
...  
Keyword(s):  
Influenza A ◽  
Infectious Virus ◽  
Electrostatic Precipitator ◽  
Collection Efficiency ◽  
Research Question ◽  
Air Sampling ◽  
Respiratory Viruses ◽  
Cascade Impactor ◽  
Vulnerable Groups ◽  
Tract Infections

AbstractViral respiratory tract infections are a leading cause of morbidity and mortality worldwide. Unfortunately, the transmission routes and shedding kinetics of respiratory viruses remain poorly understood. Air sampling techniques to quantify infectious viruses in the air are indispensable to improve intervention strategies to control and prevent spreading of respiratory viruses. Here, the collection of infectious virus with the six-stage Andersen cascade impactor was optimized with semi-solid gelatin as collection surface. Subsequently, the collection efficiency of the cascade impactor, the SKC BioSampler, and an in-house developed electrostatic precipitator was compared. In an in-vitro setup, influenza A virus, human metapneumovirus, parainfluenza virus type 3 and respiratory syncytial virus were nebulized and the amount of collected infectious virus and viral RNA was quantified with each air sampler. Whereas only low amounts of virus were collected using the electrostatic precipitator, high amounts were collected with the BioSampler and cascade impactor. The BioSampler allowed straight-forward sampling in liquid medium, whereas the more laborious cascade impactor allowed size fractionation of virus-containing particles. Depending on the research question, either the BioSampler or the cascade impactor can be applied in laboratory and field settings, such as hospitals to gain more insight into the transmission routes of respiratory viruses.Practical ImplicationsRespiratory viruses pose a continuous health threat, especially to vulnerable groups such as young children, immunocompromised individuals and the elderly. It is important to understand via which routes these viruses can transmit to and between individuals that are at risk. If we can determine the amount of a certain respiratory virus in the air, then this will help to predict the importance of transmission through the air for this virus. Most currently available air sampling devices have not been designed to collect infectious viruses from the air. Therefore, we here optimized and compared the performance of three air samplers for four different respiratory viruses.

Composition Particle-Size Relationship In Atmospheric Aerosol Samples

1990 ◽  
Vol 48 (2) ◽  
pp. 248-249
Author(s):  
J.M. Tura ◽  
C. Xaus ◽  
A. Traveria ◽  
E. Casassas ◽  
F. Garcia
Keyword(s):  
Particle Size ◽  
Atmospheric Aerosols ◽  
Atmospheric Aerosol ◽  
Heavy Traffic ◽  
Size Fraction ◽  
High Volume ◽  
Cascade Impactor ◽  
Cellulose Ester ◽  
Collection Point

The aim of this work is the scanning electron microscopy with x-ray analysis (SEM-EDX) morphological and microanalytical characterization of atmospheric aerosols in a heavy-traffic suburban area. Aerosols are sampled in a cascade impactor, during a full week. For each size-fraction a semiquantitative analysis of the more characteristic elements is perfomed. A synthetic atmospheric aerosol is used as reference material.The collection point was placed in the Montcada relay area by the Barcelona-France motorway. Sampling was perfomed during a week, with daily periodicity. A Sierra-Misco high-volume sampler with a five-stage cascade impactor was used. The aerosol samples were collected in fractions according the particle size on the different stages of the impactor and on a backup cellulose-ester absolute filter. At the flow rate used the cut-off values for the particle size collected in each stage was: 6.4, 3.1, 1.7, 0.8 and 0.39 μm. Sampling time was 24 h and the daily air volume aspired was 2.000 m3 aproximately.

Technical Note: Model Physics and Collection Efficiency in Estimates of Pesticide Spray Drift Model Performance

2020 ◽  
Vol 63 (6) ◽  
pp. 1939-1945
Author(s):  
Harold W. Thistle ◽  
Milton E. Teske ◽  
Brian Richardson ◽  
Tara M. Strand
Keyword(s):  
Forest Canopy ◽  
Collection Efficiency ◽  
Spray Deposition ◽  
Model Performance ◽  
Technical Note ◽  
Large Field ◽  
List Type ◽  
Spray Drift ◽  
Wind Fields ◽  
Data Limitations

HighlightsRecent large field programs are re-examined in the context of model development.Details of plant canopy wind fields are discussed.Collection efficiency of rotorods is discussed in detail, and the theory is used to re-examine field data.The approach used in the AGDISP model to simulate canopy wind fields is discussed in detail.Abstract. Recent field studies provided data to evaluate the performance of the aerial spray deposition algorithm in AGDISP. Those studies provided data for forest canopy settings that are either outside the stated domain of AGDISP or where assumptions in the model greatly impact the model performance. The two data sets were collected with the intention of providing input to drive model upgrades, but data limitations restricted that objective. Rather, this technical note shows that collection efficiency (CE) must always be considered (the model currently adjusts for CE only if the modeled output is canopy capture). One of the previous studies showed that the model substantially overpredicted droplet flux 65 m downwind of the spray line. Consideration of CE resolves some of this overprediction, but the model physics employed in AGDISP remain a substantial simplification of the complex flows that transport droplets in the atmospheric boundary layer near and in deep, three-dimensionally varying forest canopies. Keywords: Aerial application, AGDISP, Model, Spray drift.

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