1、Designation:D688903(Reapproved 2011)Standard Practice forFast Screening for Volatile Organic Compounds in WaterUsing Solid Phase Microextraction(SPME)1This standard is issued under the fixed designation D6889;the number immediately following the designation indicates the year oforiginal adoption or,
2、in the case of revision,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 covers a procedure for the screening oftrace levels of volatile organic c
3、ompounds in water samples byheadspace solid phase microextraction(SPME)in combinationwith fast gas chromatography with flame ionization detection.1.2 The results from this screening procedure are used toestimate analyte concentrations to prevent contamination ofpurge and trap or headspace analytical
4、 systems.1.3 The compounds of interest must have a greater affinityfor the SPME absorbent polymer or adsorbent than the samplematrix or headspace phase in which they reside.1.4 Not all of the analytes which can be determined bySPME are addressed in this practice.The applicability of theabsorbent pol
5、ymer,adsorbent or combination to extract thecompound(s)of interest must be demonstrated before use.1.5 Where used it is the responsibility of the user to validatethe application of SPME to the analytes of interest.1.6 The values stated in SI units are to be regarded asstandard.No other units of meas
6、urement are included in thisstandard.1.7 This standard 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 limita
7、tions prior to use.For specific hazardstatements,see Section 9.2.Referenced Documents2.1 ASTM Standards:2D1129 Terminology Relating to WaterD1193 Specification for Reagent WaterD3694 Practices for Preparation of Sample Containers andfor Preservation of Organic ConstituentsD3856 Guide for Management
8、Systems in LaboratoriesEngaged in Analysis of WaterD4210 Practice for Intralaboratory Quality Control Proce-dures and a Discussion on Reporting Low-Level Data(Withdrawn 2002)3D6520 Practice for the Solid Phase Micro Extraction(SPME)of Water and its Headspace for the Analysis ofVolatile and Semi-Vola
9、tile Organic Compounds3.Summary of Practice3.1 This practice employs adsorbent/gas extraction to iso-late compounds of interest,see Practice D6520.An aqueoussample is added to a small(2 mL)septum sealed vial.Salt isused to improve analyte recovery.After the addition of asurrogate standard and a shor
10、t mixing cycle,a SPME fusedsilica fiber coated with a thick polymer film is then exposed tothe aqueous headspace for a few seconds.The fiber is thendesorbed in the heated injection port of a GC/FID or GC-MSand the resulting analytes chromatographed on a short narrowbore capillary column.The total an
11、alysis time is approximately3 min.3.2 The concentrations of the volatile organics in the watersample are estimated to determine whether the sample may beanalyzed directly or first diluted prior to purge and trap orheadspace analysis.4.Significance and Use4.1 This practice provides a general procedur
12、e for thesolid-phase microextraction(SPME)of volatile organic com-pounds from the headspace of an aqueous matrix.Absorbentextraction is used as the initial step in the extraction of organicconstituents for the purpose of screening and subsequentlyestimating the concentration of the volatile organic
13、compo-nents found in water samples.This information may then beused to determine whether a sample may be analyzed directlyby purge and trap or headspace or will require dilution prior toanalysis.1This practice is under the jurisdiction of ASTM Committee D19 on Water andis the direct responsibility o
14、f Subcommittee D19.06 on Methods for Analysis forOrganic Substances in Water.Current edition approved May 1,2011.Published June 2011.Originallyapproved in 2003.Last previous edition approved in 2003 as D688903.DOI:10.1520/D6889-03R11.2For referenced ASTM standards,visit the ASTM website,www.astm.org
15、,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Dri
16、ve,PO Box C700,West Conshohocken,PA 19428-2959.United States1 4.2 Typical detection limits that can be achieved usingSPME techniques with gas chromatography(GC)with a flameionization detector(FlD)range from milligrams per litre(mg/L)to micrograms per litre(g/L).The detection limit,linear concentration range,and sensitivity of this test methodfor a specific organic compound will depend upon the aqueousmatrix,the fiber phase,the sample temperature,samplevolume,sample mixing,and the determinative t