Volume 14, No. 5, August 2014, Pages 1392-1401 PDF(939 KB)
Microstructure and Chemical Composition of Diesel and Biodiesel Particle Exhaust
Olga B. Popovicheva1, Elena D. Kireeva1, Sandro Steiner2, Barbara Rothen-Rutishauser2, Natalia M. Persiantseva1, Mikhail A. Timofeev1, Nataljia K. Shonija1, Pierre Comte3, Jan Czerwinski3
1 Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Leninskie Gory1, 119991, Moscow, Russia
2 Adolphe Merkle Institute, University of Fribourg, Route de l’ ancienne Papeterie 1723 Marly, Fribourg, Switzerland
3 Division of Automotive Engineering, Bern University of Applied Science, AFHB Abgasprufstelle Gwerdstr.5, CH-2560, Nidau, Switzerland
- Diesel/biodiesel exhaust structure reveals carbonaceous particles and fly ash.
- Fuel additives, oil contaminations, and engine wear impact exhaust composition.
- High ash lube oil increases abundance of metal oxide and sulfur-containing groups.
- Biodiesel fuel brings a group with Na, K, and Cl biofuel micromarkers.
- Developed functionalities are specific for biodiesel exhaust.
The complexity and large variability of transport-emitted aerosols leads to necessity of comprehensive characterization of their physico-chemical and toxicological properties, remaining great uncertainties in health effect assessments. Particles produced by combustion of fossil diesel (B0), 20% rapeseed methyl ester in fossil diesel (B20), and pure rapeseed methyl ester (B100) were sampled from exhaust of an Opel Astra diesel engine using sulfated ash, phosphorous and sulfur (SAPS) lube oil with low and high ash content. Microscopic and chemical characterization is performed to quantify the common and specific properties of diesel/biodiesel exhausts. Hydrophobic saturated aliphatic dominate diesel particle chemistry. Oxygen and nitrogen-containing functionalities are specific for more hydrophilic biodiesel particles. A full range of chemical species for individual particles is grouped by clustering technique combined with water-soluble ion measurements. Analysis of group abundance shows carbonaceous particles (soot externally mixed with inorganic salts) and inorganic fly ash (metal oxides) in a structure of exhaust, in correlation with inorganic contaminations in fuel and lube oil. Quantification of particle types in terms of physicochemical relevance supports the identification of groups which may act as biomicromarkers discriminating between diesel and biofuel exhaust and micromarkers of using high ash lube oil, thus providing a basis for correlative toxicological assessment of diesel/biofuel engine emissions.
Combustion particles; Diesel exhaust; Aerosols.