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Gas Chromatography-Mass Spectrometry (GCMS)

            
             Gas Chromatography-Mass Spectrometry (GCMS) was used to extract the smokeless powder. There is a 30mcapillary column which is an HP-5MS 5% phenyl methyl siloxane with a nominal diameter of 250.00 micrometers and a film thickness of 0.25 micrometers. The Helium carrier gas is maintained at a flow rate of 1.2 mL/min on the column with an average velocity of 40cm/sec. one microliter injections of the sample are introduced split less. The mass spectrometer transfer line is maintained at 250 degrees Celsius with a mass spectrometer source temperature of 230 degree Celsius. Mass Spectra are scanned between 43 and 400 m/z. the solvent delay is 4.00 minutes. The injection port temperature was maintained at 170 degrees Celsius. The initial pressure 30 PSI for one minute. The initial oven temperature of 40 degree is held for 1 minute, followed by a temperature ramp of 25 degrees Celsius per minute to a final temperature of 280 degrees Celsius, which is held for three minutes. Positive identification of an analyte is determined by a 3 to 1 signal-to-noise ratio in the TIC or EIC, the presence of at least three major ions. .
             KEYWORDS.
             Gas Chromatography Mass Spectrometry, isothermal, wet-needle injection, gas-tight syringe, extraction, hydrocarbon ladder standard, carbon strip, substrate, ignitable liquid.
             Gas Chromatography-Mass Spectrometry (GCMS) is an analytical method that combines the features of gas-liquid chromatography and mass spectrometry to identify different substances within a test sample. Gas Chromatography is used for separating components in a mixture, and Mass Spectrometer is used in the qualitative and quantitative analysis of each component that was separated by the GC. The combination of these two highly applicable techniques creates possibly the most commonly used instrument for analytical scientists (1). Infrared Spectrometry deals with the infrared region of the electromagnetic spectrum that is light with a longer wavelength and lower frequency than visible light.


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