Laboratory 2 has the highest TC results, except for Sample Set 2. Each laboratory except the University of Stockholm was assigned one or two filters from each sample set at random. Sort Popularity Alphabetical. Monitoring of diesel particulate exhaust in the workplace. In the second stage of the analysis, any residual char from the pyrolyzed organics is oxidized, along with the original EC, under a mixture of oxygen and helium. Ming Chai1 M. A relatively simple method for generating matched filter sets having known OC—EC contents is reported. Fine particulate air pollution and mortality in 20 U. Soot oxidation in fibrous filters.
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Atmos Environ. Though many interlaboratory comparisons have been conducted, they have not employed filter sets with known OC—EC content and an OC component that chars.
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In addition to adverse effects on human health, EC particles have adverse environmental impacts, such as reduced atmospheric visibility [ Intergovernmental Panel on Climate Change IPCC].
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N Engl J Med. The two remaining punches on each filter were analyzed by the study participants. Abstract Carbonaceous aerosols play an important role in climate, visibility, air quality, and human health effects, and they have been routinely monitored in workplace and environmental settings. Show 16 items 32 items View All. J Environ Monit. Sampling and analysis of carbon in diesel exhaust particulates—an international comparison.
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Schematic of generation system for collection of OC—EC reference filters. Some efforts to fabricate reference filters have been reported, but generation of a matched filter set with known and even deposition of OC—EC aerosol has been problematic Master, ; Iskandar et al. OC emissions have many sources, including forest fires, commercial and home cooking, automobiles, power generation facilities, and many other industrial sources. The following day, the vials were shaken again and then centrifuged at rpm.
The good agreement between laboratories also indicates that heating the filters after sample collection does not affect the EC content, as is expected. Mention of product or company name does not constitute endorsement by the Centers for Disease Control and Prevention.
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Though TOA has been widely applied to OC—EC measurement for many years, there has been inconsistency between different analysis protocols, and between OC and EC methods generally, with differences depending on sample composition Birch et al.
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Though many interlaboratory comparisons have been conducted, they have not employed filter sets with known OC—EC content and an OC component that chars.
Interlaboratory comparison results for EC micrograms per square centimeter in four laboratory-generated filter sets. Glass micro fiber filters are available without binders, making the inertmatrix…. The EC particles typically carry various metals and thousands of organic compounds, some of which are genotoxic.
Monitoring of diesel particulate exhaust in the workplace. The first punches were analyzed in-house NIOSH Cincinnati within a month after sample generation, and two additional punches were analyzed from between 3 and 6 months after generation some laboratories had instrument problems and other issues that prevented analysis for several months.
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|Log In. About 50 ml of the alginic acid solution or EC dispersion was used in the nebulizer for generation of OC or EC aerosol.
National Center for Biotechnology InformationU. For the interlaboratory evaluation, four sample sets were collected, with 10—12 filter samples in each set. Different thermal analysis methods have been applied to determine the carbon content of carbonaceous aerosols.