1、Designation:E245113Standard Practice forPreserving Ignitable Liquids and Ignitable Liquid ResidueExtracts from Fire Debris Samples1This standard is issued under the fixed designation E2451;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revis
2、ion,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice describes procedures for preserving resi-dues of ignitable liquids in extracts obtained from
3、fire debrissamples and questioned ignitable liquid samples.Extractionprocedures are described in the Referenced Documents.1.2 This practice does not attempt to address all the issuesregarding the short-term or long-term storage of ignitableliquid samples and ignitable liquid extracts from fire debri
4、ssamples.The changes that may occur under various storageconditions have not been fully documented.1.3 This practice cannot replace knowledge,skill,or abilityacquired through appropriate education,training,and experi-ence and should be used in conjunction with sound profes-sional judgment.1.4 This s
5、tandard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 AS
6、TM Standards:2E1386 Practice for Separation of Ignitable Liquid Residuesfrom Fire Debris Samples by Solvent ExtractionE1388 Practice for Sampling of Headspace Vapors from FireDebris SamplesE1412 Practice for Separation of Ignitable Liquid Residuesfrom Fire Debris Samples by Passive Headspace Concen-
7、tration With Activated CharcoalE1413 Practice for Separation and Concentration of Ignit-able Liquid Residues from Fire Debris Samples by Dy-namic Headspace ConcentrationE1459 Guide for Physical Evidence Labeling and RelatedDocumentationE1492 Practice for Receiving,Documenting,Storing,andRetrieving E
8、vidence in a Forensic Science LaboratoryE1618 Test Method for Ignitable Liquid Residues in Extractsfrom Fire Debris Samples by Gas Chromatography-MassSpectrometryE2154 Practice for Separation and Concentration of Ignit-able Liquid Residues from Fire Debris Samples by Pas-sive Headspace Concentration
9、 with Solid Phase Microex-traction(SPME)3.Summary of Practice3.1 Extracts obtained from fire debris samples and ques-tioned liquids analyzed for the presence of ignitable liquidresidues are retained and preserved for potential reanalysis byTest Method E1618.4.Significance and Use4.1 The archiving of
10、 extracts recovered from fire debris orliquids submitted in a fire investigation provides a mechanismto preserve extracts and liquids for reanalysis in the event thatsample loss,sample degradation,or failure of the fire debriscontainer occurs during post-analysis storage of fire debrisevidence.4.2 T
11、he nature of some extraction procedures,which maypreclude reanalysis,is considered.4.3 Changes to a preserved sample extract and the length oftime it remains viable under storage conditions are unknown.4.4 The concentration and composition of the ignitableliquid residue or the use of an alternate ex
12、traction/concentration technique used to preserve a sample extract ofthe fire debris sample may result in different findings betweenthe analysis of the preserved sample and the original analysis.5.Materials5.1 AirtightandVapor-Tight,Volatile-FreeStorageContainersThe following are suggested container
13、 types:5.1.1 Septum crimp vials with PTFE-lined seals.5.1.2 Screw cap glass vials with PTFE-lined seals.5.1.3 Polymer evidence bags(this does not include polyeth-ylene or polypropylene-type containers).1This practice is under the jurisdiction of ASTM Committee E30 on ForensicSciences and is the dire
14、ct responsibility of Subcommittee E30.01 on Criminalistics.Current edition approved June 1,2013.Published July 2013.Originally approvedin 2008.Last previous edition approved in 2008 as E2451 08.DOI:10.1520/E2451-13.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Cus
15、tomer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.2 Adsorption Media:5.2.1 Activated char
16、coal(coconut).5.2.2 Activated charcoal strips.6.Procedure6.1 Passive Headspace Concentration with Activated Char-coal(Practice E1412).6.1.1 Single-Strip Adsorption:6.1.1.1 After analysis,the eluted and analyzed extract maybe retained for preservation.Readsorb the extract onto thecharcoal strip by allowing the eluent to evaporate.Store thecharcoal strip in an appropriate container for preservation.6.1.1.2 Alternatively,after adsorption and before elution,divide the strip.Use one portion of the st
