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Determination of polycyclic aromatic sulfur heterocycles in diesel particulate matter and diesel fuel by gas chromatography with atomic emission detection.

Authors
Liang-F; Lu-M; Birch-ME; Keener-TC; Liu-Z
Source
J Chromatogr A 2006 May; 1114(1):145-153
NIOSHTIC No.
20030041
Abstract
The sulfur content of diesel fuel is of environmental concern because sulfur can facilitate the formation of diesel particulate matter (DPM) and sulfur dioxide (SO(2)) in the exhaust can poison catalytic converters. The US Environmental Protection Agency (EPA) has established more stringent regulations to reduce the sulfur content of diesel fuels in the near future. In this study, various types of organosulfur compounds in DPM extracts and the corresponding fuels have been determined by gas chromatography with atomic emission detection. The diesel fuels used have sulfur contents of 2284 and 433ppm, respectively, and are labeled as high-sulfur and low-sulfur diesel fuels. The compounds identified are mainly polycyclic aromatic sulfur heterocycles (PASHs). In the fuels tested, trimethylbenzothiophenes (TMBTs), dibenzothiophenes (DBTs), and 4-methyldibenzothiophene (4-MDBT) were the most abundant sulfur compounds, while larger PASH compounds were more abundant in DPM extracts. The high-sulfur diesel fuel contained a larger proportion of PASHs with one or two rings (lighter PASHs). In DPM, the concentrations of total organic sulfur and individual PASHs are higher for the high-sulfur diesel fuel, and the relative percentage of one or two-ring PASHs is higher as well. The influence of engine load on the DPM composition was also examined. With increasing load, the PASH concentration in DPM decreased for lighter PASHs, increased for heavier PASHs, and had a bell-shaped distribution for PASHs in between.
Keywords
Diesel-exhausts; Diesel-emissions; Particulates; Particulate-dust; Fuels; Gas-chromatography; Sulfur-compounds; Organo-sulfur-compounds
Contact
Department of Civil and Environmental Engineering, University of Cincinnati, P.O. Box 210071, Cincinnati, OH 45221, USA
CODEN
JCRAEY
CAS No.
7704-34-9
Publication Date
20060501
Document Type
Journal Article
Funding Amount
509978
Funding Type
Grant
Fiscal Year
2006
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-007679
Issue of Publication
1
ISSN
0021-9673
NIOSH Division
DART
Priority Area
Research Tools and Approaches: Exposure Assessment Methods; Research Tools and Approaches: Control Technology and Personal Protective Equipment
Source Name
Journal of Chromatography A
State
OH
Performing Organization
University of Cincinnati
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