Pyrogenic vs Petrogenic Source Determination: Diagnostic PAH ratios. Gordon Nelson Andrew Garrard
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1 Pyrogenic vs Petrogenic Source Determination: Diagnostic PAH ratios Gordon Nelson Andrew Garrard
2 The Issue One of the most common analysis in environmental labs is petroleum hydrocarbon analysis by gas chromatography. CCME CWS for PHCs was the starting point for much of what is done in different jurisdictions today. Although a common parameter this analysis can sometimes lead to additional interpretation/analysis to clarify the situation
3 Gas Chromatography / Flame Ionization Detection
4 Identification Petroleum Products Various Fresh Gasoline Aviation Gasoline Weathered Gasoline Jet Fuel A New Motor Oil Diesel
5 Identification Biogenic Hydrocarbons Real sample suspected to be Peat Moss
6 Pyrogenic Hits Potential co-extractive material could be pyrogenic in nature. Combustion by-products won t all be removed by silica gel. GC/FID patterns not definitive. PAH and extended PAH analysis can be a useful next step.
7 PAHs
8 PAH Analysis: Extended list Naphthalene Phenanthrene Benzo(a)anthracene 2-Methylnaphthalene Anthracene Chrysene 1-Methylnaphthalene C1-phenanthrene/ anthracene C1-Benz(a)anthracene/Chrysenes C2-Naphthalenes C2-phenanthrenes/ anthracenes C2-Benz(a)anthracene/Chrysenes C3-Naphthalenes C3-phenanthrenes/ anthracenes Benzo(b)fluoranthene C4-Naphthalenes C4-phenanthrenes/ anthracenes Benzo(k)fluoranthene Biphenyl Fluoranthene Benzo(e)pyrene C1-Biphenyl Pyrene Benzo(a)pyrene C2-Biphenyl C1-Fluoranthenes/Pyrenes Perylene Acenaphthylene C2-Fluoranthenes/Pyrenes C1-Benzofluoranthenes/ benzopyrenes Acenaphthene C3-Fluoranthenes/Pyrenes C2-Benzofluoranthenes/ benzopyrenes C1-Acenaphthene C4-Fluoranthenes/Pyrenes Indeno(1,2,3-cd)pyrene Fluorene Dibenzothiophene Dibenzo(ah)anthracene C1-Fluorenes C1-Dibenzothiophene Benzo(ghi)perylene C2-Fluorenes C3-Fluorenes C2-Dibenzothiophene C3-Dibenzothiophene C4-Dibenzothiophene
9 GC/MS Analysis
10 Mass Spectrometry Saturated Hydrocarbons This is a classic hydrocarbon pattern Note the regular spacing of the clusters at intervals of 14 mass units. Also, the largest line in each cluster is an odd value. N-hexadecane
11 Mass Spectrometry
12 PAH Analysis: Extracted Ion Profile
13 Diagnostic Ratios Certain PAHs compounds will be preferentially formed in either pyrogenic or petrogenic situations. Calculation of Diagnostic ratios between PAHs. Phenanthrene/Anthracene Fluoranthene/Pyrene (Fl+Py)/(Fl+Py+C2C4Ph) Pyrogenic Index: Zhendi Wang et al: Environmental Science and Technology Centre, Environment Canada.
14 Pyrogenic Index PI = [other(3-6) ring PAHs] / [5 alkylated PAHs]
15 Pyrogenic Index Source Material PI Light refined products <0.01 Heavier refined products <0.03 Heavy oils/crudes <0.05 Pyrogenic materials >0.05 Weathering will cause a slight increase in PI values
16 Experimental Design Clean control soils. Clean control soils spiked with petrogenic source materials. Clean control spiked with pyrogenic source material. Randomly selected real world samples with positive F2-F4 results. Analysis F2-F4 PHC determination by GC/FID Alkylated and parent PAH analysis by GC/MS/SIM
17 F2-F4 Results Sample F2 F3 F4 High moisture plus crude High moisture plus motor oil Low plus crude Low plus motor oil BBQ Sample Fire pit sample
18 F2-F4 Chrom: Crude Example
19 F2-F4 Chrom: Motor Oil Example
20 F2-F4 Chrom: BBQ
21 F2-F4 Chrom: Fire Pit
22 Control Diagnostic Ratios Sample Phen/Anth Fluor/Pry (Fl+Py)/(Fl+Py+C 2C4Ph) MPHE/ PHE PI High moisture plus crude High moisture plus motor oil N.A. N.A. N.A. 0 0 Low plus crude Low plus motor oil N.A. N.A. N.A. N.A. 0 BBQ Sample Fire pit sample N.A. N.A Ph/An for Pyrogenic <10 Fluor/Pyr for pyrogenic >1 PI for pyrogenic >0.05 (Fl+Py)/(Fl+Py+C2C4Ph) >0.2 for Pyro
23 Subt d PAH Distribution: Motor Oil
24 Subt d PAH distribution: Crude Oil
25 Subt d PAH Distribution: BBQ
26 Subt d PAH Distribution: Fire Pit
27 F2-F4 Results: Real World Samples Sample F2 F3 F4 Sample # Sample # Sample # Sample #
28 Real World Sample Diagnostic Ratios Sample Phen/Anth Fluor/Pry (Fl+Py)/(Fl+Py+C2C4Ph) MPHE/ PHE PI Sample # Sample # Sample # Sample # Ph/An for Pyrogenic <10 Fluor/Pyr for Pyrogenic >1 MPHE/PHE for Pyro PI for Pyrogenic >0.05 (Fl+Py)/(Fl+Py+C2C4Ph) >0.2 for Pyro
29 Subt d PAH Distribution: Sample 1
30 Subt d PAH Distribution: Sample 2
31 Subt d PAH Distribution: Sample 3
32 Subt d PAH Distribution: Sample 4
33 Subt d PAH Distribution: Sample vs Crude Spike vs Pyrogenic
34 Summary Phenanthrene/Anthracene: least reliable. Fluoranthene/Pyrene: decent (Fl+Py)(Fl+Py+C2C4Ph) : better Mphe/Phe : mixed PI: most conclusive Distinctive patterns were noticed from alkyl PAH plots
35 Conclusions The more compounds utilized in the ratios the better. Useful ratios: (Fl+Py)(Fl+Py+C2C4Ph) Mphe/Phe PI These in combination with visual inspection of the alkyl PAH plots can be used as diagnostic tools in determining pyrogenic sources in cases of potential wood based combustion byproducts.
36 QUESTIONS AND DISCUSSION Thank you
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