1、Designation:D643805(Reapproved 2022)Standard Test Method forAcetone,Methyl Acetate,and ParachlorobenzotrifluorideContent of Paints,and Coatings by Solid PhaseMicroextraction-Gas Chromatography1This standard is issued under the fixed designation D6438;the number immediately following the designation
2、indicates the year oforiginal adoption or,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 test method is for the determination of
3、acetone,methyl acetate,or parachlorobenzotrifluoride(PCBTF),orcombination of any of the three,in paints and coatings,by solidphase microextraction(SPME)headspace sampling,and sub-sequent injection into a gas chromatograph.It has beenevaluated for cellulose nitrate,acrylic,and urethane solvent-borne
4、systems.The established working range of this testmethod is:acetone,28 to 90%;methyl acetate,12 to 22%;parachlorobenzotrifluoride,10 to 17%.There is no reason tobelieve that it will not work outside these ranges.A minormodification of this test method would make it suitable for theanalysis of the sa
5、me analytes in water-borne coatings(see Note1).NOTE1Water-borne paints are internally standardized and dilutedwith water followed by addition of solid sodium chloride.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3 This s
6、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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.4 This inter
7、national standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Comm
8、ittee.2.Referenced Documents2.1 ASTM Standards:2D3925 Practice for Sampling Liquid Paints and RelatedPigmented CoatingsD6133 Test Method for Acetone,p-Chlorobenzotrifluoride,Methyl Acetate or t-Butyl Acetate Content of Solvent-borne and Waterborne Paints,Coatings,Resins,and RawMaterials by Direct In
9、jection Into a Gas ChromatographE180 Practice for Determining the Precision of ASTMMethods for Analysis and Testing of Industrial and Spe-cialty Chemicals(Withdrawn 2009)33.Terminology3.1 Abbreviations:3.1.1 PCBTFparachlorobenzotrifluoride(4-chlorobenzotrifluoride)3.1.2 MCBTFmetachlorobenzotrifluori
10、de(3-chlorobenzotrifluoride)3.1.3 SPMEsolid phase microextraction3.1.4 VOCvolatile organic compound3.1.5 PEG/DVBpolyethylene glycol/divinylbenzene3.1.6 FIDflame ionization detector3.1.7 MSmass selective or mass spectral3.1.8 SIMselected ion monitoring3.1.9 GCgas chromatograph3.1.10 Srrepeatability s
11、tandard deviations3.1.11 SRreproducibility standard deviations3.1.12 rrepeatability,95%confidence limit1This test method is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.21 on Chemical Analysis
12、 of Paints and Paint Materials.Current edition approved June 1,2022.Published July 2022.Originally approvedin 1999.Last previous edition approved in 2015 as D6438 05(2015).DOI:10.1520/D6438-05R22.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at se
13、rviceastm.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 Drive,PO Box C700,West Conshohocken,PA 19
14、428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Techni
15、cal Barriers to Trade(TBT)Committee.13.1.13 Rreproducibility,95%confidence limit4.Summary of Test Method4.1 A suitable aliquot of whole solvent-borne paint isinternally standardized and diluted with dioctyl phthalate.Theheadspace of this solution is sampled with an SPME fiber,which is then thermally
16、 desorbed in the injection port of a gaschromatograph onto a suitable capillary column.Either a flameionization or mass specific detector may be used to measurepeak areas of analytes and internal standards.5.Significance and Use5.1 In order to calculate the volatile organic content(VOC)of paints containing EPA exempt solvents,it is necessary toknow the acetone,methyl acetate,or parachlorobenzotrifluo-ride content.This gas chromatographic test method provides asimple and direct way for measuring