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Uncertainties of polynuclear aromatic hydrocarbon and carbonyl measurements in heavy‐duty diesel emission
Author(s) -
Mabilia Rosanna,
Cecinato Angelo,
Guerriero Ettore,
Possanzini Massimiliano
Publication year - 2006
Publication title -
journal of separation science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.72
H-Index - 102
eISSN - 1615-9314
pISSN - 1615-9306
DOI - 10.1002/jssc.200500199
Subject(s) - hydrocarbon , diesel fuel , polycyclic aromatic hydrocarbon , aromatic hydrocarbon , chemistry , environmental chemistry , environmental science , analytical chemistry (journal) , organic chemistry
In this note we describe the speciated particle‐phase PM 2.5 polynuclear aromatic hydrocarbon (PAH) and gas‐phase carbonyl emissions as collected from a heavy‐duty diesel bus outfitted with an oxidation catalyst for exhaust after‐treatment. The vehicle was run on a chassis dynamometer during a transient cycle test reproducing a typical city bus route (Azienda Tramviaria Municipalizzata cycle). The diluted tailpipe emissions were sampled for PAH using a 2.5 μm cut size cyclone glass fiber filter assembly, while carbonyls were absorbed onto dinitrophenyl hydrazine‐coated silica cartridges. The former compounds were analysed by CGC‐MS, the latter by HPLC‐UV. Combining the two sets of speciation data resulting from 15 identical dynamometer tests provided a profile of both unregulated organic emissions. PAH emission rates decreased with the number of benzene fused rings. Fluoranthene and pyrene amounted to 90% of total PAHs quantified; six‐ring PAHs accounted only for 0.5%. Similarly, formaldehyde and acetaldehyde accounted for ˜ 80% of the total carbonyl emissions. Uncertainties of the method in the determination of individual emission factors were calculated. Statistical data processing revealed that all the measurements were quite unaffected by systematic errors and repeatability percentages did not exceed 50% for the majority of components of both groups.