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Weathering Patterns of Ignitable Liquids with the Advanced Distillation Curve Method.

Bruno TJ, Allen S - J Res Natl Inst Stand Technol (2013)

Bottom Line: In this paper, we present results on a variety of ignitable liquids that are not commodity fuels, chosen from the Ignitable Liquids Reference Collection (ILRC).These measurements are assembled into a preliminary database.From this selection, we discuss the significance and forensic application of the temperature data grid and the composition explicit data channel of the ADC.

View Article: PubMed Central - PubMed

Affiliation: National Institute of Standards and Technology, Boulder, CO 80305.

ABSTRACT
One can take advantage of the striking similarity of ignitable liquid vaporization (or weathering) patterns and the separation observed during distillation to predict the composition of residual compounds in fire debris. This is done with the advanced distillation curve (ADC) metrology, which separates a complex fluid by distillation into fractions that are sampled, and for which thermodynamically consistent temperatures are measured at atmospheric pressure. The collected sample fractions can be analyzed by any method that is appropriate. Analytical methods we have applied include gas chromatography (with flame ionization, mass spectrometric and sulfur chemiluminescence detection), thin layer chromatography, FTIR, Karl Fischer coulombic titrimetry, refractometry, corrosivity analysis, neutron activation analysis and cold neutron prompt gamma activation analysis. We have applied this method on product streams such as finished fuels (gasoline, diesel fuels, aviation fuels, rocket propellants), crude oils (including a crude oil made from swine manure) and waste oils streams (used automotive and transformer oils). In this paper, we present results on a variety of ignitable liquids that are not commodity fuels, chosen from the Ignitable Liquids Reference Collection (ILRC). These measurements are assembled into a preliminary database. From this selection, we discuss the significance and forensic application of the temperature data grid and the composition explicit data channel of the ADC.

No MeSH data available.


Related in: MedlinePlus

The distillation curve for STP Diesel Fuel Injector Treatment presented in Tk and Th. The curves presented are the averages of five separate measurements. The uncertainties relating to the measurements have been discussed in the text.
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f3-jres.118.003: The distillation curve for STP Diesel Fuel Injector Treatment presented in Tk and Th. The curves presented are the averages of five separate measurements. The uncertainties relating to the measurements have been discussed in the text.

Mentions: Vaporized fluid taken off the flask is directed into a forced-air condenser chilled with a vortex tube. The vortex tube can produce a cold air stream to a temperature as low as −40 °C. Following the condenser, the distillate enters a newly designed transfer adapter that allows instantaneous sampling of distillate for chemical analysis by any applicable means. The flow path of the distillate is focused to drop into a 0.05 mL “hammock” that is positioned directly below the flow path. A crimp cap fixture is incorporated as a side arm of the adapter, allowing a replaceable silicone or Teflon septum seal) to be positioned in line with the hammock. To sample the distillate, one simply uses a chromatographic syringe equipped with a blunt tipped needle, as shown in Fig. 3.


Weathering Patterns of Ignitable Liquids with the Advanced Distillation Curve Method.

Bruno TJ, Allen S - J Res Natl Inst Stand Technol (2013)

The distillation curve for STP Diesel Fuel Injector Treatment presented in Tk and Th. The curves presented are the averages of five separate measurements. The uncertainties relating to the measurements have been discussed in the text.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4487305&req=5

f3-jres.118.003: The distillation curve for STP Diesel Fuel Injector Treatment presented in Tk and Th. The curves presented are the averages of five separate measurements. The uncertainties relating to the measurements have been discussed in the text.
Mentions: Vaporized fluid taken off the flask is directed into a forced-air condenser chilled with a vortex tube. The vortex tube can produce a cold air stream to a temperature as low as −40 °C. Following the condenser, the distillate enters a newly designed transfer adapter that allows instantaneous sampling of distillate for chemical analysis by any applicable means. The flow path of the distillate is focused to drop into a 0.05 mL “hammock” that is positioned directly below the flow path. A crimp cap fixture is incorporated as a side arm of the adapter, allowing a replaceable silicone or Teflon septum seal) to be positioned in line with the hammock. To sample the distillate, one simply uses a chromatographic syringe equipped with a blunt tipped needle, as shown in Fig. 3.

Bottom Line: In this paper, we present results on a variety of ignitable liquids that are not commodity fuels, chosen from the Ignitable Liquids Reference Collection (ILRC).These measurements are assembled into a preliminary database.From this selection, we discuss the significance and forensic application of the temperature data grid and the composition explicit data channel of the ADC.

View Article: PubMed Central - PubMed

Affiliation: National Institute of Standards and Technology, Boulder, CO 80305.

ABSTRACT
One can take advantage of the striking similarity of ignitable liquid vaporization (or weathering) patterns and the separation observed during distillation to predict the composition of residual compounds in fire debris. This is done with the advanced distillation curve (ADC) metrology, which separates a complex fluid by distillation into fractions that are sampled, and for which thermodynamically consistent temperatures are measured at atmospheric pressure. The collected sample fractions can be analyzed by any method that is appropriate. Analytical methods we have applied include gas chromatography (with flame ionization, mass spectrometric and sulfur chemiluminescence detection), thin layer chromatography, FTIR, Karl Fischer coulombic titrimetry, refractometry, corrosivity analysis, neutron activation analysis and cold neutron prompt gamma activation analysis. We have applied this method on product streams such as finished fuels (gasoline, diesel fuels, aviation fuels, rocket propellants), crude oils (including a crude oil made from swine manure) and waste oils streams (used automotive and transformer oils). In this paper, we present results on a variety of ignitable liquids that are not commodity fuels, chosen from the Ignitable Liquids Reference Collection (ILRC). These measurements are assembled into a preliminary database. From this selection, we discuss the significance and forensic application of the temperature data grid and the composition explicit data channel of the ADC.

No MeSH data available.


Related in: MedlinePlus