ASTM E1388-2005 Standard Practice for Sampling of Headspace Vapors from Fire Debris Samples《从火烧瓦砾样品中进行液上蒸气取样的标准实施规程》.pdf

1、Designation: E 1388 05Standard Practice forSampling of Headspace Vapors from Fire Debris Samples1This standard is issued under the fixed designation E 1388; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision.

2、 A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This practice covers the procedure for removing smallquantities of ignitable liquid vapor from samples of fire debrisby sampling th

3、e headspace of the debris container.1.2 Separation and concentration procedures are listed in thereferenced documents. (See Practices E 1385, E 1386, E 1412,and E 1413.)1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility o

4、f 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 ASTM Standards:2E 1385 Practice for Separation and Concentration of Ignit-able Liquid Residues from Fire Debris Samples

5、 by SteamDistillationE 1386 Practice for Separation and Concentration of Ignit-able Liquid Residues from Fire Debris Samples by SolventExtractionE 1387 Test Method for Ignitable Liquid Residues in Ex-tracts from Samples of Fire Debris by Gas Chromatogra-phyE 1412 Practice for Separation and Concentr

6、ation of Ignit-able Liquid Residues from Fire Debris Samples by PassiveHeadspace ConcentrationE 1413 Practice for Separation and Concentration of Ignit-able Liquid Residues from Fire Debris Samples by Dy-namic Headspace ConcentrationE 1459 Guide for Physical Evidence Labeling and RelatedDocumentatio

7、nE 1492 Practice for Receiving, Documenting, Storing, andRetrieving Evidence in a Forensic Science LaboratoryE 1618 Test Method for Ignitable Liquid Residues in Ex-tracts from Fire Debris Samples by Gas Chromatography-Mass Spectrometry3. Summary of Practice3.1 The sample, preferably in its original

8、container, isheated in order to volatilize any petroleum products present inthe debris. After heating, the headspace is sampled andanalyzed by gas chromatography, GC/MS, or GC/IR.4. Significance and Use4.1 This procedure is particularly useful for screening firedebris samples to determine relative i

9、gnitable liquid concen-trations and possible ignitable liquid class prior to extractionwith other techniques.4.2 This practice is useful when volatile oxygenated prod-ucts such as alcohols or lacquer thinners are suspected.4.3 This practice is the least sensitive of the sample prepa-ration technique

10、s and may not detect quantities of less than 10L of petroleum product.4.4 Because this separation takes place in a closed con-tainer, the sample remains in approximately the same conditionin which it was submitted. Repeat and interlaboratory analysesare therefore possible.4.5 Due to variables in the

11、 debris sample condition prior toheadspace sampling, complete reproducibility of chromato-grams may be difficult to obtain.4.5.1 To obtain greater reproducibility, use one of theseparation procedures which results in a solution of theflammable or combustible liquid residue (see Practices E 1385,E 13

12、86, E 1412, and E 1413.)4.6 High concentrations of highly volatile compounds mayswamp the headspace, inhibiting the recovery of less volatilecomponents.5. Apparatus5.1 Heating SystemAn oven, heating mantle or hot platedesigned to fit the evidence container.5.2 Temperature Measuring DeviceA thermomet

13、er orthermocouple capable of measuring temperatures in the rangefrom 40 to 150C.5.3 A gastight syringe capable of reproducibility introduc-ing sample sizes in the range from 0.5 to 5 mL.1This practice in under the jurisdiction of ASTM Committee E30 on ForensicSciences and i s the direct responsibili

14、ty of Subcommittee E30.01 on Criminalistics.Current edition approved Sept. 1, 2005. Published October 2005. Originallyapproved in 1990. Last previous edition approved in 2005 as E 138800(2005).2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at se

15、rviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.5.4 A drill, punch or other device to puncture holes

16、insample containers.6. Sample Preparation6.1 Observe the appropriate procedures for handling anddocumentation of all submitted samples as described in GuideE 1459 and Practice E 1492.6.1.1 Open and examine the fire debris sample in order todetermine that it is consistent with its description.6.1.1.1

17、 Resolve any discrepancies between the submittingagents description of the evidence and the analysts observa-tion with the submitting agent prior to the completion of thereport.6.2 Punch or drill a small hole in the container lid and coverthe hole with tape.6.2.1 Alternatively, a rubber sleeve stopp

18、er may be placedin the hole.6.3 If the sample is going to be heated, place the containerin the heating system until the container reaches the desiredtemperature (not to exceed 90C).6.4 The syringe may be heated prior to sampling7. Sampling Procedure7.1 Remove the container from the heating apparatus

19、, pushthe syringe through the tape or rubber sleeve stopper into thehole in the container lid. Slowly pump the syringe three times,withdraw from the lid, and inject 0.5 to 2.0 mL of sample intothe gas chromatograph. Analyze as described in Test MethodE 1387 or Guide E 1618.7.1.1 The optimum sample s

20、ize will vary with chromato-graph column and conditions.7.2 After the headspace sample has been removed, resealthe hole.8. Keywords8.1 fire debris samples; headspaceASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this

21、 standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be

22、reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of therespo

23、nsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).E1388052