Airborne particulate collection

Air, airborne particulates Collection on cellulose acetate filter digestion with concentrated nitrated and perchloric acids ICP-AES, NIOSH 7300 1 Mg/ sample 105% at 2.5 Mg 97% at 1 mg NIOSH 1994b... 

Airborne concentrations of perfluoroalkyl substances are limited largely to neutral chemicals containing a perfluoroalkyl moiety, however, one study reported detection of PFOS in 4 out of 8 samples of airborne particulates collected above Lake Ontario (mean = 6.4pg/m3) [25]. While this finding has yet to be replicated by other investigators, it does suggest that PFOS may be... 

The results of spectrographic analysis of sedimented airborne particulates collected during routine monitoring of the environment show high, environmentally caused, variability. Objective assessment of loading states, and still less of emission sources, can, there-... 

This type of counting device is designated in ASTM 3365-74T as a Tentative method of test for concentration and size distribution of airborne particulates collected in liquid media . It is specified that the method is suitable for particulate matter greater than 0.6 pm in diameter collected by a Greenburg-Smith or midget impinger. The original development of the method was carried out by Anderson et. al. [7] and was extended by others. 

NPAHs in airborne particulates collected at a heavy traffic road site in Kanazawa, Japan were analyzed. Fig. 1 shows chromatograms of (A) benzene-ethanol extracts from airborne particulates and (B) 21 standard NPAHs. All NPAHs except for 10-NBA were detected in the extracts. The total atmospheric concentrations of NPAHs were 3.85 pg/m and this value was 1.7 times higher than that obtained by the previous method (2.28 pg/m ). Nine newly determined NPAHs were measured. The new NPAHs and their atmospheric concentrations (in pg/m ) were 3-NBA (0.01), 5-NAc (0.28), 4-NPh (0.09), 9-NPh (0.34), 2-NA (0.25), 9-NA (0.20), 3-NFR (0.22),... 

FIGURE 13.1 GC-MSD profile of the neutral highly polar fraction in airborne particulate collected in Milan, Italy, in December, 2006. 

Figure Eight. Scanning Electron Micrographs showing the nature of some black crust surfaces on sandstone buildings in Belfast, together with examples of airborne particulates collected in the city.

List several types of air cleaning devices that can be used to remove airborne particulate matter. Rank these in order of their collection efficiency and typical maximum size particle capture. 

Barale, R., L. Giromini, S. Del Ry, B. Barnini, M. Bulleri, I. Barrai, F. Valerio, M. Pala, J. He, Chemical and Mutagenic Patterns of Airborne Particulate Matter Collected in 17 Italian Towns, Environ. Health Perspect., 102, 67-73 (1994). 

Lee, F. S. C., W. R. Pierson, and J. Ezike, The Problem of PAH Degradation during Filter Collection of Airborne Particulates—An Evaluation of Several Commonly Used Filter Media, in Polynuclear Aromatic Hydrocarbons Chemical and Biological Effects... 

Collection of airborne particulates in workplace atmospheres can be achieved effectively by a variety of filtering media which are amenable to use with personal sampling devices. Extraction of the particulates from the filters with suitable solvents results in solutions which may then be analyzed by the developed analytical technique. 

Three commercially available filtering media were evaluated for the collection of airborne particulates of the organoarsenical compounds. These were cellulose ester, Fluoropore, and Mitex membrane filters. The evaluation was based on the following requirements l) the collection medium must quantitatively collect the particulates 2) the collection medium must be capable of. retaining the compounds without loss or chemical change before analysis 3) the collected species must be extracted quantitatively from the collection medium for analysis and b) the method must be efficient at temperatures up to 50°C and a relative humidity of... 

Three filtering media commercially available from Millipore Corporation were evaluated for the collection of airborne particulates of the organoarsenical compounds. These were (l) cellulose ester membranes (2) Fluoropore and (3) Mitex. The cellulose ester membrane filters (0.8 ym pore size) are the standard Millipore filters used for aerosol sampling and consist of a mixture of cellulose nitrate and cellulose acetate. The Fluoropore filters are made of Teflon (PTFE) and are bonded to a polyethylene net. Fluoropore filters with a pore size of 1.0 ym were selected for this study. 

FujiwaraFG, Gomez DR, Dawidowski L, Perelman P, Faggi A (2011) Metals associated with airborne particulate matter in road dust and free bark collected in a megacity (Buenos Aires, Argentina). Ecol Indie ll(2) 240-247. 

Recommended Method airborne particles collected on a sorbent cartridge containing polyurethane foam particulates deposited on the filter extracted with methylene chloride extract analyzed by GC-FID or GC/MS recommended air flow 5 L/min sample volume 1000 L. 

Table 3.2 shows measurements of particulate and gaseous stable iodine in the atmosphere. Moyers et al. (1971) used membrane filters and activated charcoal to collect the particulate and gaseous fractions in air at Boston, and found the ratio Ip/Ig to be correlated with the concentration of particulate lead in the air. It was not inferred that Ip was combined with particles of lead, but rather that the concentrations of lead served as an index of the total airborne particulate. Moyers et al. expressed their results as... 

The basis of the application of FA was a data matrix containing 17 features of 52 sedimented airborne particulate samples collected during a period when buildings were being heated. According to Fig. 7-10 the application of the scree plot [CATTELL, 1966] indicates four common factors. 

Golden and Sawicki [17] studied ultrasonic extraction of almost all of the polar compounds from airborne particulate material collected on Hi-Vol filters. Full recovery of PAH and good reproducibility were achieved. Total analysis time was approximately 1.5 hours. The same research group also reported a sonication procedure for the extraction of total particulate aromatic hydrocarbon (TpAH) from airborne particles collected on glass fiber filters [18]. Significantly higher recovery of TpAH and PAH were achieved by 40 minutes of sonication than by 6 to 8 hours of Soxhlet extraction. 

Faley Status 8000 measures particles in non-corrosive liquids from 1 to 150 pm, using either of two available sensors based on the light extinction principle. Counts are collected in up to six preset particle sizes. Faley Status also manufacture several counters for airborne particulates. 

Methods for Particulates and Gases. For determining the organic content of particulates we have found the usual method of collecting airborne particulates on specially cleaned fiberglass filters to be suitable. The particulate filters then are extracted and the organic extract can be further partitioned by the above scheme or analyzed without any separation. SHALE OIL... 

Marcus et al. [234] used a glow-discharge source with direct injection of particles for special samples such as airborne particulates [234]. This novel concept was tested on NIST SRM 1648 Urban Particulate Matter (a composite of airborne particles collected in St Louis, Missouri) as well as on ground caffeine powder and various pure organic substances. 

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