Ignitable Liquid Residue Analysis

Ignitable Liquid Residue (ILR) Analysis Is A Scientific Process Used To Detect The Presence Of Ignitable Liquids Such As Petrol, Diesel, Kerosene, And Crude Oil At Fire Scenes. The Process Of ILR Analysis Is Used To Determine If An Accelerant Was Present At The Scene Of The Fire And, If So, Identify The Type Of Accelerant Used. ILR Analysis Is Of Critical Importance To Fire Investigators Because It Can Indicate Whether A Fire Was Set Deliberately Or Occurred Spontaneously. Fire Investigators Seek ILR Evidence By Collecting And Analyzing Fire Debris Or Other Materials Which Could Contain Residues From Ignitable Liquids. Fire Debris Such As Carpet Fibers, Wood, Linoleum, And Plastics Are Collected Using Forceps, Tweezers, Or Brushes And Placed In Evidence Bags For Further Analysis. These Items Are Then Tested Using A Variety Of Instrumental Techniques Such As Gas Chromatography-Mass Spectrometry (GC-MS) Or Liquid Chromatography-Mass Spectrometry (LC-MS). GC-MS And LC-MS Are Two Of The Most Common Methods Used In ILR Analysis. In GC-MS, The Liquid Samples Are Vaporized And Injected Into The Injection Port Of A Gas Chromatography Device. The Device Separates Out The Individual Components Of The Sample According To Their Boiling Points. These Components Are Then Detected Using A Mass Spectrometer So That The Identity Of Any Ignitable Liquids Can Be Determined. In LC-MS, The Contents Of Liquid Samples Are Injected Into A Liquid Chromatography Device. The Device Separates The Components Of The Sample According To Their Polarity. These Components Are Then Ionized So That They Can Be Detected By The Mass Spectrometer. By Monitoring The Mass-To-Charge Ratio Of Each Component, The Identity Of Any Ignitable Liquids Can Be Determined. In Addition To GC-MS And LC-MS, Fire Debris Can Also Be Tested Using Fourier Transform Infrared Spectroscopy (FTIR), Portable Ignitable Liquid Residue Detector (PILR), And Pyrolysis-Gas Chromatography-Mass Spectrometry (Pyr-GC-MS). Each Of These Techniques Has Its Own Advantages And Disadvantages, So The Choice Of Which Technique To Use Will Depend On The Type Of Evidence That Needs To Be Analyzed. ILR Analysis Is An Important Tool Used By Fire Investigators. The Choice Of Which Technique To Use Depends On The Type Of Evidence That Needs To Be Analyzed. By Collecting And Analyzing Ignitable Liquid Residue, Investigators Can Learn Important Information About The Source And Cause Of A Fire.