Characterisation of ship diesel primary particulate matter at the molecular level by means of ultra-high-resolution mass spectrometry coupled to laser desorption ionisation--comparison of feed fuel, filter extracts and direct particle measurements.

摘要: In this study, positive-mode laser desorption-ionisation ultra-high-resolution mass spectrometry (LDI-FT-ICR-MS) was applied to study combustion aerosol samples obtained from a ship diesel engine as well the feed fuel, used operate engine. Furthermore, particulate matter sampled exhaust tube using an impactor and analysed directly impaction foil without sample treatment. From high percentage of shared sum formula similarities in chemical spread heavy fuel oil, results indicate that primary mainly consists survived, unburned species fuel. The effect pyrosynthesis could be observed slightly more pronounced for CH-class compared other compound classes, but summary not dominant. Alkylation pattern aromaticity distribution, double bond equivalent, revealed shift towards lower alkylation state aerosol. most dominant series higher correlation between different than samples. This confirmed by cluster analysis. Overall, shows LDI-FT-ICR-MS can successfully analysis at molecular level information identify differences size fractions matter.