It covers a range of techniques, mostly based on absorption spectroscopy. Fourier transform infrared (FTIR) spectroscopy is a vibrational spectroscopic technique that uses infrared radiation to vibrate molecular bonds within the sample that absorbs it. As different samples contain different molecular bonds or different configurations of molecular bonds, FTIR allows us to obtain chemical information on molecules within the sample (6).
Experiment .
Materials- Smokeless Powder Sample: Unknown 8 (16 kernels), Methylene, Acetone, GC Liquid injection syringe, Gas-tight syringe, Gas Chromatography Mass Spectrometer, Infrared Spectrometry, ATR-FTIR.
Procedure.
Gas Chromatography-Mass Spectrometry (GCMS): The GCMS should be programed specifically to receive proper data. The injection port should be set to 250 degrees Celsius and a split injection is in process at 50:1. The Mass Spectrometer source is set to 200 degrees Celsius and the transfer line to 280 degrees Celsius. The temperature profile is set to isothermal at 50 degrees Celsius for three minutes. The ramp temperature is at 10 degrees Celsius per minute to 280 degrees Celsius it is then held at 280 degrees Celsius for 4 minutes with a total run time of 30 minutes. The mass scan range is 30-350.
We then analyze the Hydrocarbon Ladder Standard as a simple wet needle injection of the commercial ignitable liquid is performed. We can identify some major peaks using the library software and compare them using the ILRC database.
Next, place the substrate on a tin plate, and transfer 1 mL of the commercial liquid to the substrate and light it. Once it is done burning, place the substrate in the quart metal can. Attach a string with tape to the top of the quarts can while the other side of the string has a carbon strip attached. Allow the string to have some slack but make sure it does not touch the substrate debris. Close the top of the can securely and place the can on the Bunsen burner at a temperature of 65 degrees Celsius for approximately 30 minutes.
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