title: Elements and polycyclic aromatic hydrocarbons in exhaust particles emitted by light-duty vehicles.
abstract: The main purpose of this work was to evaluate the chemical composition of particulate matter (PM) emitted by eight different light-duty vehicles. Exhaust samples from petrol and diesel cars (Euro 3 to Euro 5) were collected in a chassis dynamometer facility. To simulate the real-world driving conditions, three ARTEMIS cycles were followed: road, to simulate a fluid traffic flow and urban with hot and cold starts, to simulate driving conditions in cities. Samples were analysed for the water-soluble ions, for the elemental composition and for polycyclic aromatic hydrocarbons (PAHs), respectively, by ion chromatography, inductively coupled plasma atomic emission spectroscopy (ICP-AES), inductively coupled plasma mass spectrometry (ICP-MS) and gas chromatography-mass spectrometry (GC-MS). Nitrate and phosphate were the major water-soluble ions in the exhaust particles emitted from diesel and petrol vehicles, respectively. The amount of material emitted is affected by the vehicle age. For vehicles ≥Euro 4, most elements were below the detection limits. Sodium, with emission factors in the ranges 23.5-62.4 and 78.2-227μg km(-1), for petrol and diesel Euro 3 vehicles, respectively, was the major element. The emission factors of metallic elements indicated that diesel vehicles release three to five times more than petrol automobiles. Element emissions under urban cycles are higher than those found for on-road driving, being three or four times higher, for petrol vehicles, and two or three times, for diesel vehicles. The difference between cycles is mainly due to the high emissions for the urban cycle with hot start-up. As registered for elements, most of the PAH emissions for vehicles ≥Euro 4 were also below the detection limits. Regardless of the vehicle models or driving cycles, the two- to four-ring PAHs were always dominant. Naphthalene, with emission factors up to 925 μg km(-1), was always the most abundant PAH. The relative cancer risk associated with naphthalene was estimated to be up to several orders of magnitude higher than any of the chemical species found in the PM phase. The highest PAH emission factors were registered for diesel-powered vehicles. The condition of the vehicle can exert a decisive influence on both element and PAH emissions.
authors.affiliation: Centre for Environmental and Marine Studies, Department of Environment, University of Aveiro, 3810-193, Aveiro, Portugal, celia.alves@ua.pt.
authors.forename: Célia A
authors.initials: CA
authors.lastname: Alves
authors.forename: Cátia
authors.initials: C
authors.lastname: Barbosa
authors.forename: Sónia
authors.initials: S
authors.lastname: Rocha
authors.forename: Ana
authors.initials: A
authors.lastname: Calvo
authors.forename: Teresa
authors.initials: T
authors.lastname: Nunes
authors.forename: Mário
authors.initials: M
authors.lastname: Cerqueira
authors.forename: Casimiro
authors.initials: C
authors.lastname: Pio
authors.forename: Angeliki
authors.initials: A
authors.lastname: Karanasiou
authors.forename: Xavier
authors.initials: X
authors.lastname: Querol
mesh_terms: D000393:Air Pollutants / Q000032:analysis; D001336:Automobiles; D002947:Cities; D004784:Environmental Monitoring; D005060:Europe; D008401:Gas Chromatography-Mass Spectrometry; D005742:Gasoline / Q000032:analysis; D057230:Limit of Detection; D052638:Particulate Matter / Q000032:analysis*; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis*; D001335:Vehicle Emissions / Q000032:analysis*
chemical_list: D000393:Air Pollutants; D005742:Gasoline; D052638:Particulate Matter; D011084:Polycyclic Aromatic Hydrocarbons; D001335:Vehicle Emissions
references.citation: Lancet. 2002 Oct 19;360(9341):1203-9
references.pmid: 12401246
references.citation: Environ Pollut. 2009 Aug-Sep;157(8-9):2320-7
references.pmid: 19386405
references.citation: Environ Sci Pollut Res Int. 2014 Feb;21(3):1769-1785
references.pmid: 23979848
references.citation: Inhal Toxicol. 2007;19 Suppl 1:107-16
references.pmid: 17886058
references.citation: Sci Total Environ. 2004 Dec 1;334-335:73-84
references.pmid: 15504494
references.citation: J Air Waste Manag Assoc. 2006 Jun;56(6):709-42
references.pmid: 16805397
references.citation: Environ Health Perspect. 2006 Sep;114(9):1387-93
references.pmid: 16966093
references.citation: Environ Sci Technol. 2013 Dec 17;47(24):14495-501
references.pmid: 24274188
references.citation: Environ Sci Pollut Res Int. 2014 Jun;21(12):7708-22
references.pmid: 24627204
references.citation: Environ Sci Technol. 2007 Nov 1;41(21):7464-71
references.pmid: 18044527
references.citation: Environ Sci Technol. 2007 Jul 15;41(14):5037-43
references.pmid: 17711220
references.citation: Toxicol Sci. 2005 Jan;83(1):155-65
references.pmid: 15483187
references.citation: J Air Waste Manag Assoc. 2004 Sep;54(9):1138-50
references.pmid: 15468666
references.citation: Sci Total Environ. 2011 Mar 15;409(8):1466-75
references.pmid: 21277615
references.citation: J Air Waste Manag Assoc. 2007 Jun;57(6):705-20
references.pmid: 17608006
references.citation: Sci Total Environ. 2004 Jul 5;327(1-3):147-62
references.pmid: 15172578
references.citation: Environ Sci Pollut Res Int. 2011 Aug;18(7):1202-12
references.pmid: 21373859
references.citation: Environ Sci Technol. 2002 Nov 1;36(21):4656-62
references.pmid: 12433178
references.citation: Environ Sci Technol. 2005 Jun 15;39(12):4569-80
references.pmid: 16047794
references.citation: Part Fibre Toxicol. 2005 Oct 21;2:10
references.pmid: 16242040
references.citation: Environ Sci Process Impacts. 2013 Feb;15(2):412-22
references.pmid: 25208706
references.citation: J Air Waste Manag Assoc. 2013 Aug;63(8):984-96
references.pmid: 24010380
references.citation: Environ Sci Technol. 2002 Mar 15;36(6):1169-80
references.pmid: 11944666
references.citation: Environ Sci Technol. 2009 Aug 1;43(15):5928-33
references.pmid: 19731699
references.citation: Lancet. 2007 Feb 17;369(9561):571-7
references.pmid: 17307103
references.citation: Environ Sci Pollut Res Int. 2013 May;20(5):3240-51
references.pmid: 23089955
references.citation: Part Fibre Toxicol. 2006 Sep 08;3:13
references.pmid: 16961926
references.citation: Environ Sci Technol. 2008 Aug 15;42(16):6080-5
references.pmid: 18767669
references.citation: Environ Sci Technol. 2005 Jul 15;39(14 ):5276-84
references.pmid: 16082957
references.citation: J Environ Monit. 2009 Sep;11(9):1614-21
references.pmid: 19724830
references.citation: Environ Sci Pollut Res Int. 2012 Jun;19(5):1791-9
references.pmid: 22203401
references.citation: Environ Sci Technol. 2010 Nov 1;44(21):8343-9
references.pmid: 20886845
references.citation: Environ Sci Pollut Res Int. 2014 Sep;21(18):10949-59
references.pmid: 24859696
references.citation: Inhal Toxicol. 2000 Jan;12 Suppl 2:121-35
references.pmid: 26368526