EPA Motor Vehicle Emissions Characterization Projects on Light and Heavy Duty Diesels

Baines, Thomas M.; Somers, J.; Hellman, Karl H.

doi:10.1080/00022470.1982.10465455

Cited by 7 publications

(1 citation statement)

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“…As for engine design, the on-road diesel values in Table I pertain to heavy-duty diesel trucks with direct-injection engines (mostly 4-stroke), whereas the laboratory measurements pertain to indirect-injection (prechamber) 4stroke engines, light duty in all cases but one. Benzo-[a] pyrene and N02 data obtained by Baines et al (39) suggest that the difference between direct injection and indirect injection may not be important for 1NP formation. However, one limited comparison (24) does leave open the possibility of some other difference(s) between light-and heavy-duty diesels that could cause lower 1NP emissions from the latter.…”

Section: Discussionmentioning

confidence: 91%

1-Nitropyrene concentration and bacterial mutagenicity in on-road vehicle particulate emissions

Gorse¹,

Riley²,

Ferris³

et al. 1983

Environ. Sci. Technol.

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The halogenation reactions of 1,3-dihydroxyaromatic compounds and simple methyl ketones in dilute aqueous solution have been investigated in order to elucidate the mechanism of analogous processes involving naturally occurring humic material. The 1,3-dihydroxyaromatic model compounds were most reactive with maximum yields of CHC13 (>90%) and CHBr3 (>70%) at pH 8-10 with substrate concentrations of 10"® M and halogen concentrations of 10"5-10"4 M. At high chlorine concentrations, substantial yields of a variety of Cl-substituted carboxylic acids were detected, whereas at low [Cl2] values, a number of important polyhalogenated reaction intermediates were identified. Halogenation of resorcinol-2-13C produced 13CHC13 and 13CHBr3 with isotopic enrichments equivalent to that of the labeled precursor. The experimental data are generally consistent with a dominant haloform-type reaction mechanism, but some details of these results strongly suggest that several competitive pathways are also involved.

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Section: Discussionmentioning

confidence: 91%