000			03752nam a2200253 4500
001			393929
090			_a393929
100			_a20160523d2013 y0pory50 ba
101			_aeng
200			_aDevelopment of a sampling system to stabilize ignitable liquid residues in fire debris _bRecurso eletrónico _efinal technical report _fDee Turner ...[et al.]
210			_a[Rockville, MD] _cNational Criminal Justice Reference Service (NCJRS) _d2013
215			_a1 CD-ROM _d12 cm
300			_aResearch report submitted to the U.S. Department of Justice. Award Number 2010-DN-BX-K036. Ficheiro de 7,94 MB em formato PDF (46 p.).
330			_aIgnitable liquid residues that are found in soils or similar materials are susceptible to microbiological attack following sample collection at a fire scene. The fact that microorganisms can metabolize components of petroleum is a well-known phenomenon to chemists responsible for analyzing fire debris. Unfortunately, the turnaround time for a fire debris case is typically more than sufficient for significant and irreversible microbial decomposition of ignitable liquid residues to occur under the right conditions. If allowed to progress unchecked, microbial degradation can eliminate the vast majority of compounds that constitute an ignitable liquid residue and ultimately lead to incorrect, inconclusive or false negative findings in fire debris cases that involve soil samples.In this work, two approaches were pursued to avoid microbial degradation of ignitable liquid residues in soil. The first was to inhibit or eliminate the microbes naturally present in soil. While some laboratories refrigerate or freeze fire debris to minimize bacterial attack, this technique is expensive, space consuming and of mixed effectiveness. We have developed a practical and effective preservative that can be used by investigators in the field to stabilize fire debris evidence. This solution consists of the anti-microbial agent triclosan, which is non-volatile and could be safely deployable by investigators. The effectiveness of triclosan has been evaluated using microbiological techniques and testing of realistic soil samples using ASTM methods verified that ignitable liquid residues can be effectively preserved for periods of up to 30 days.The second approach involved a sampling container that could immediately partition ignitable liquid residues from fire debris. This container utilized an activated charcoal strip that is isolated from the fire debris, thereby adapting a passive adsorption method that can immediately begin to extract ignitable liquid residues from fire debris upon collection at a fire scene. It was hoped that such a container would increase the recovery of ignitable liquids from any matrix and also help to avoid any degradation that may occur within the soils. However, the influence of discrimination effects and a lack of improved recovery as compared to traditional methods made this approach unattractive.Overall, we have sought to monitor, characterize and prevent microbial degradation of ignitable liquid residues in soil. In particular, it is anticipated that the antimicrobial solution developed here will result in increased sample integrity and a vastly improved ability to accurately identify an ignitable liquid in a fire debris sample that contains soil.
606			_aPRODUTO INFLAMÁVEL _9343931
606			_aINCÊNDIO _9243828
606			_aANÁLISE DE VESTÍGIOS _9320649
606			_aCIÊNCIA FORENSE _9321508
606			_aQUÍMICA FORENSE _9343048
710			_aDEVELOPMENT OF A SAMPLING SYSTEM TO STABILIZE IGNITABLE LIQUID RESIDUES IN FIRE DEBRIS _9358112
955			_xOferta