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A new approach to the hydrocarbons (HC) speciation in autovehicular exhaust is presented here based on the addition of target deuterated HC to the fuel. Since deuterated compounds cannot be formed during the combustion process, their emission allow to assess their origin from the deuterated / hydrogenated concentration ratio in the fuel and in the exhaust. The percentage of unburnt and formed compound in the emission can be measured, discriminating the contribution of its original concentration from that of the remaining fuel components. Furthermore it is possible to verify the relationship between potential precursors and deuterated, or partly deuterated, metabolites. Similarly the HC present in the particulate emission can be traced. Monitoring the persistence of deuterated compounds in the exhaust, after their use, is a valuable tool for checking carry over effects.

Deuterated n-paraffins and polyaromatic compounds were added to a reference oil to elucidate its role on the emission of Soluble Organic Compound at diesel exhaust. This work carries on from previous investigations applied to fuel doping with deuterated compounds [1]. Both direct emissions and indirect effects, due to dilution with fuel components and combustion products are investigated. Furthermore the addition of deuterated compounds, is applied to calculate unburned percentage, to study the metabolism of lube oil component and can be applied to measure lube oil consumption. In this paper the results obtained on a light duty and a heavy duty vehicle fuelled with a reference fuel are presented. Particular attention was paid to total particulate and semi volatile phases.