AI Article Synopsis
- Compound-specific isotope analysis can help identify diesel fuel types, but evaporation effects on isotopes need to be considered.
- The study measured how stable carbon and hydrogen isotopes in n-alkane compounds change during the evaporation of diesel fuel over 21 days at a controlled temperature.
- Findings show that as carbon chain length increases, there's greater depletion of deuterium in remaining liquid, while carbon isotope ratios remain stable, highlighting the importance of these results for forensic application in diesel analysis.
Article Abstract
Compound-specific isotope analysis offers potential for fingerprinting of diesel fuels, however, possible confounding effects of isotopic fractionation due to evaporation need to be assessed. This study measured the fractionation of the stable carbon and hydrogen isotopes in n-alkane compounds in neat diesel fuel during evaporation. Isotope ratios were measured using a continuous flow gas chromatograph/isotope ratio mass spectrometer. Diesel samples were progressively evaporated at 24 ± 2°C for 21 days. Increasing depletion of deuterium in nC12-nC17 alkanes in the remaining liquid with increasing carbon chain length was observed. Negligible carbon isotope fractionation was observed. Preferential vaporization was measured for the shorter chain n-alkanes and the trend decreased with increasing chain length. The decrease in δ(2) H values indicates the preferential vaporization of the isotopically heavier species consistent with available quantitative data for hydrocarbons. These results are most important in the application of stable isotope technology to forensic analysis of diesel.
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| http://dx.doi.org/10.1111/1556-4029.12551 | DOI Listing |
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