Polycyclic Aromatic Hydrocarbons In Gasoline and Their Appl

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Polycyclic Aromatic Hydrocarbons In Gasoline and Their Appl




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Presentations text content in Polycyclic Aromatic Hydrocarbons In Gasoline and Their Appl

Slide1

Polycyclic Aromatic Hydrocarbons In Gasoline and Their Applications to Arson Investigations

By Kathleen Barbosa

Slide2

Forensic Chemistry

Arson Investigations

Components of ignition and combustion reaction FuelOxidizing AgentHeatUninhibited Chemical Chain ReactionIdentify Ignitable Liquid Residues (IRLs) Fire Accelerant vs IRLs

Slide3

Identifying IRLs

Specific Polycyclic Aromatic Hydrocarbons (PAHs) in gasoline

Ability to extract and identify these compounds even when sample is significantly evaporated

soot

19 specific compounds in gasoline soot

Ability to differentiate from

pyrolysis

residues of carrier

objects

Slide4

Laboratory Analysis

Common methods

Solid Extraction

Solids suspended in liquid

Headspace

extraction

Gas above sample in vial

Adsorption Extraction

Many techniques

GC-MS

Comparison of known ignitable liquids

Database

Must be from same instrument

Slide5

PAHs in Gasoline

19 compounds

Most abundant Naphthalene2-Methylnaphthalene 1-MethylnaphthaleneBiphenylAcenaphthylene

Slide6

PAHs (or lack there of) in Diesel

Higher number of alkenes

Pattern differencesPetrol refineries/oilAbundance of compoundsDodecaneTridecane2-MethylnaphthaleneTetradecane

Slide7

GC-MS Data

Gasoline

Diesel

Slide8

What’s

The Point?

Identification of Arson Use of accelerants commonPour PatternsLocalized BurningSeized Sample ComparisonMatching to specific station??Class evidenceThe future!Hydrocarbon SniffersTrained by chemists!Insurance Fraud

Slide9

Written Component

Crime Prevention Pamphlet

Hot On Your Heels!

How Forensic Chemistry Helps Convict Arsonists

Slide10

References

Chih

-Ming Huang, et al. "Identification Of Gasoline Soot In Suspect Arson Cases By Using Headspace Solid Phase

Microextraction

–GC/MS." Analytical Letters 37.7: 1373-1384. Academic Search Complete, 2004.

Chordas

, L. (2011). No bones about it: State Farm's Arson Dog Program trains and funds accelerant-detection dogs to sniff out fraud. Best's Review, (7). 104.

Stauffer, E., Dolan, J., Newman, R. (2008). "Extraction of Ignitable Liquid Residues from Fire Debris". Fire Debris Analysis. Academic Press. pp. 387–426.

Wu, C., Chen, C., Huang, C., Lee, M., & Huang, C. (2004). Identification of Gasoline Soot in Suspect Arson Cases by Using Headspace Solid Phase

Microextraction

–GC/MS. Analytical Letters, 37(7), 1373-1384. doi:10.1081/AL-120035904

Zhi

, Y.,

Zong

, R.,

Guangxuan

, L., Liu, H., &

Jialei

, T. (2013). The source identification and classification study of soot after combustion. Fire & Materials, 37(3), 246-256. doi:10.1002/fam.2132

Slide11

BURNING QUESTIONS?


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