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Influence of fuel properties, nitrogen oxides, and exhaust treatment by an oxidation catalytic converter on the mutagenicity of diesel engine emissions

  • Genotoxicity and Carcinogenicity
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Abstract

Particle emissions of diesel engines (DEP) content polycyclic aromatic hydrocarbons (PAH) these compounds cause a strong mutagenicity of solvent extracts of DEP. We investigated the influence of fuel properties, nitrogen oxides (NO x ), and an oxidation catalytic converter (OCC) on the mutagenic effects of DEP. The engine was fuelled with common diesel fuel (DF), low-sulphur diesel fuel (LSDF), rapeseed oil methyl ester (RME), and soybean oil methyl ester (SME) and run at five different load modes in two series with and without installation of an OCC in the exhaust pipe. Particles from the cooled and diluted exhaust were sampled onto glass fibre filters and extracted with dichloromethane in a soxhlet apparatus. The mutagenicity of the extracts was tested using the Salmonella typhimurium/mammalian microsome assay with tester strains TA98 and TA100. Without OCC the number of revertant colonies was lower in extracts of LSDF than in extracts of DF. The lowest numbers of revertant colonies were induced by the plant oil derived fuels. In three load modes, operation with the OCC led to a reduction of the mutagenicity. However, direct mutagenic effects under heavy duty conditions (load mode A) were significantly increased for RME (TA98, TA100) and SME (TA98). A consistent but not significant increase in direct mutagenicity was observed for DF and LSDF at load mode A, and for DF at idling (load mode E) when emissions were treated with the OCC. These results raise concern over the use of oxidation catalytic converters with diesel engines. We hypothesise that the OCC increases formation of direct acting mutagens under certain conditions by the reaction of NO x with PAH resulting in the formation of nitrated-PAH. Most of these compounds are powerful direct acting mutagens.

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Abbreviations

DEP:

Diesel engine particles

DF:

Common diesel fuel

LSDF:

Low sulphur diesel fuel

NO X :

Nitrogen oxides

OCC:

Oxidation catalytic converter

PAH:

Polycyclic aromatic hydrocarbons

RME:

Rapeseed oil methyl ester

SME:

Soybean oil methyl ester

SOF:

Soluble organic fraction

TPM:

Total particulate matter

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Correspondence to Jürgen Bünger.

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Bünger, J., Krahl, J., Weigel, A. et al. Influence of fuel properties, nitrogen oxides, and exhaust treatment by an oxidation catalytic converter on the mutagenicity of diesel engine emissions. Arch Toxicol 80, 540–546 (2006). https://doi.org/10.1007/s00204-006-0088-y

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  • DOI: https://doi.org/10.1007/s00204-006-0088-y

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