Field evaluation of a cost-effective screening procedure for polynuclear aromatic pollutants in ambient air samples

1984 ◽  
Vol 18 (6) ◽  
pp. 477-482 ◽  
Author(s):  
Tuan. Vo-Dinh ◽  
Timothy J. Bruewer ◽  
George C. Colovos ◽  
Thomas J. Wagner ◽  
Robert H. Jungers
Keyword(s):  
Cost Effective ◽  
Field Evaluation ◽  
Ambient Air ◽  
Screening Procedure ◽  
Aromatic Pollutants ◽  
Air Samples ◽  
Effective Screening

Electron Microscopic Characterization and Quantitation of Air Borne Particulate Matter with Special Emphasis on Asbestos

1972 ◽  
Vol 30 ◽  
pp. 356-357
Author(s):  
Peter K. Mueller ◽  
Glenn R. Smith ◽  
Leslie M Carpenter ◽  
Ronald L. Stanley
Keyword(s):  
Electron Microscopy ◽  
Light And Electron Microscopy ◽  
Ambient Air ◽  
Quality Standard ◽  
Primary Objective ◽  
Cellulose Ester ◽  
Main Concept ◽  
Electron Microscopic ◽  
Air Samples ◽  
Diffraction Patterns

At the present time the primary objective of the electron microscopy group of the Air and Industrial Hygiene Laboratory is the development of a method suitable for use in establishing an air quality standard for asbestos in ambient air and for use in its surveillance. The main concept and thrust of our approach for the development of this method is to obtain a true picture of fiber occurrence as a function of particle size and asbestos type utilizing light and electron microscopy.We have now available an electron micrographic atlas of all asbestos types including selected area diffraction patterns and examples of fibers isolated from air samples. Several alternative approaches for measuring asbestos in ambient air have been developed and/or evaluated. Our experiences in this regard will be described. The most promising method involves: 1) taking air samples on cellulose ester membrane filters with a nominal pore size of 0.8 micron; 2) ashing in a low temperature oxygen plasma for several hours;

scholarly journals Polybrominated diphenyl ethers (PBDEs) in ambient air samples at the electronic waste (e-waste) reclamation site

2019 ◽  
Vol 1 (1) ◽  
pp. 79-89 ◽  
Author(s):  
Ajit Ghimire ◽  
Albert Leo N. dela Cruz ◽  
Roberto Wong ◽  
Panida Navasumrit ◽  
Stephania Cormier ◽  
...  
Keyword(s):  
Polybrominated Diphenyl Ethers ◽  
Electronic Waste ◽  
Ambient Air ◽  
Air Samples ◽  
Diphenyl Ethers ◽  
Waste Reclamation

scholarly journals Motion – Screening and Surveillance of Barrett’s Epithelium Is Practical and Cost Effective: Arguments against the Motion

2002 ◽  
Vol 16 (8) ◽  
pp. 541-545 ◽  
Author(s):  
Naoki Chiba
Keyword(s):  
Cost Effective ◽  
World Health ◽  
Endoscopic Screening ◽  
Effective Screening ◽  
Screening And Surveillance ◽  
Screening Protocol ◽  
Surveillance Programs ◽  
Prolongation Of Life ◽  
Health Organization ◽  
Very High

The issue of whether to screen individuals for Barrett’s esophagus (BE) to prevent esophageal adenocarcinoma (EAC) is highly controversial. Important considerations are that BE is not highly prevalent in the general population and that not many patients with BE develop or die from EAC. Studies that suggest an improved prognosis from surveillance programs are susceptible to lead-time bias. Most of the principles for effective screening, as outlined by the World Health Organization, are not met by endoscopic screening and surveillance protocols. The diagnosis of BE (and dysplasia) is often unclear. Most patients with BE are not identified by screening, and few deaths would be prevented by surveillance. A decision analysis found that the most cost effective screening protocol would be every five years, but the costs associated with prolongation of life are very high, even if a group at high risk for EAC could be identified.

In the vicinity of a rendering plant it is very difficult to find a really unpolluted place for the olfactometric measurements. Although the most unpolluted site luff of the plant was chosen, another precaution was taken. As adaption of the panelists to the plant odour could cause one of the greatest errors, some minutes before and during the measurement the panelists inhale solely odourless air from the olfactometer. To prevent discomfort by inhaling completely dry air, the olfactometer Modell 1158 is supplied with a moistening device, fig. 1. Fig. 1. Moistening device. In a standard impinger, filled with destillated water, air is moistened close to saturation. An equal flow of moistened air is mixed to the olfactometer outlet, thus delivering to the panelist a rel. moisture content of nearly 50 %. The panel consisted of 4 persons. The samples are prediluted taken into plastic bags, simultaneously at the inlet (raw air) and at the outlet (cleaned air) of the air cleaners. To receive an unfalsified sample from the outlet of the biofilters, undiluted by ambient air, a "tent” of plastic foil, fig. 2, is placed on the filter surface. The cleaned air blows up the tent and escapes through the sample hole, large enough to prevent a significant increase of pressure. The form of the upblown tent indicates, wether a sample area with normal air flow is chosen, and over the space of the covered filter area of 6,25m2 an average sample is received. Fig. 2. Device for cleaned air samples from biofilter outlet.

1986 ◽  
pp. 238-238
Keyword(s):  
Ambient Air ◽  
Air Samples ◽  
Dry Air ◽  
Filter Surface ◽  
Plastic Bags ◽  
Plastic Foil ◽  
Air Cleaners ◽  
Unpolluted Site ◽  
Filter Area ◽  
To Receive

Tracing the sources of PCDD/Fs in Baltic Sea air by using metals as source markers

2018 ◽  
Vol 20 (3) ◽  
pp. 544-552 ◽  
Author(s):  
Anteneh Assefa ◽  
Mats Tysklind ◽  
Jana Klanova ◽  
Karin Wiberg
Keyword(s):  
Baltic Sea ◽  
Ambient Air ◽  
Air Mass ◽  
Back Trajectories ◽  
Air Samples ◽  
Metal Source ◽  
Source Markers

A combination of PCDD/F patterns and metal source markers in ambient air samples together with stable air mass back trajectories can reveal the most significant atmospheric sources of PCDD/Fs.

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