Submicrometer and supermicrometer particles from diesel vehicle emissions

Article Abstract:

The number concentration and size distributions of particulates in the exhausts of diesel vehicles were determined to prove that fine airborne particulates greatly affects human health than larger particles. Current air quality emission standards are often based on particle mass concentration that lead to misinterpretation of exposures. The Scanning Mobility Particle Sizer and Aerodynamic Particle Sizer yielded an average particle number concentration of the exhausts in the range (90.7-3.9)x107 cm-3 and (0.0075-0.304 micronm), respectively.

Research and Development in the Physical, Engineering, and Life Sciences, Administration of Air and Water Resource and Solid Waste Management Programs, Air Pollution Control R&D, Emissions NEC, Health aspects, Air pollution control, Bulk solids, Air pollution, Air pollution research, Pollution control research, Emissions (Pollution)

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Evidence for a new class of mutagens in diesel particulate extracts

Article Abstract:

A comparison of strain TA102 to TA98 in terms of mutagenicity distribution among chromatographic fractions of a diesel particle extract is discussed. Diesel particle extracts were subjected to high performance liquid chromatography. Nitroareness was quantified fron the diesel particle extract by selected-ion gas chromatography/mass spectrometry. It was found that a new class of DNA-oxidizing compounds have been detected by TA102 in diesel particle extracts.

Methods, Analysis, Diesel fuels, Mutagenicity testing, Mutagenicity tests

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Chemical fractionation of particulate extracts from diesel vehicle exhaust: distribution of ligands for the dioxin receptor

Article Abstract:

Diesel vehicle exhaust particulates underwent chemical fractionation to determine relative dioxin receptor binding affinities. The exhaust particulates contained 28 polycyclic aromatic compounds. The ability of the derived fractions to compete for 2,3,7,8-tetrachloro(1,6-3H)dibenzo-p-dioxin's receptor was measured. The study was not able to determine the ligands that were most effective in binding.

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