ASTM_D_7768_-_12.pdf

Designation:D776812Standard Test Method forSpeciated Organic Volatile Content of Waterborne Multi-Component Coatings by Gas Chromatography1This standard is issued under the fixed designation D7768;the number immediately following the designation 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 the indi-vidual organic volatile compounds of waterborne multi-component coatings using gas chromatography(see Note 1).1.2 The method has also been used successfully to deter-mine the speciated volatile organic content of solvent-bornemulti-component coatings.Work is continuing to develop thisaspect of the method and will be added to the method at a laterdate.NOTE1Currently there are no methods for the direct analysis of theVOC content of waterborne multi-component coatings.The VOC contentof solvent-borne multi-component coatings is determined directly by asimple weight loss determination of the mixed components(Test MethodD2369).1.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.4 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 limitations prior to use.Some specifichazards statements are given in Section 7 on Hazards.2.Referenced Documents2.1 ASTM Standards:2D1475 Test Method For Density of Liquid Coatings,Inks,and Related ProductsD2369 Test Method for Volatile Content of CoatingsD3792 Test Method for Water Content of Coatings by DirectInjection Into a Gas ChromatographD3925 Practice for Sampling Liquid Paints and RelatedPigmented CoatingsD3960 Practice for Determining Volatile Organic Compound(VOC)Content of Paints and Related CoatingsD4017 Test Method for Water in Paints and Paint Materialsby Karl Fischer MethodD6133 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 Injection Into a Gas ChromatographD7358 Test Method for Water Content of Paints by Quanti-tative Calcium Hydride Reaction Test KitE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method3.Terminology3.1 Acronyms:3.1.1 EB2-butoxyethanol;Butyl Cellosolve,3ethyleneglycol monobutyl ether3.1.2 EGDEethylene glycol diethyl ether3.1.3 FIDflame ionization detector3.1.4 GCgas chromatogaphy3.1.5 MSmass spectrometry3.1.6 SPDEsolid phase dynamic extraction3.1.7 SPMEsolid phase microextraction4.Summary of Test Method4.1 The components are mixed,a sample of the mixture isweighed into a 20 mL headspace vial,the vial is sealed with acrimp cap,and the mixture is allowed to cure for 24 h or longerat ambient temperature.After the initial cure,the sample isheated for 30 min at 110C.After cooling,a known quantity ofacetone containing an internal standard is added to the sealedvial and the contents are mixed.The solution containing theorganic volatile compounds is then analyzed by gas chro-matograhpy(Note 2).NOTE2If the cured coating contains free amines,acetone may bereplaced with tetrahydrofuran(THF)as the extraction solvent.Using theprovisions of Practice D3960,the VOC content of coatings measured in1This 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 of Paints and Paint Materials.Current edition approved Aug.1,2012.Published October 2012.DOI:10.1520/D776812.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Butyl Cellosolve is a registered trademark of The Dow Chemical Company.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 g/L minus water,or other units,may be determined.Since the determi-nation of weight percent VOC in the present method is by directmeasurement,either the water fraction(Test Method D3792 or TestMethod D4017)or the nonvolatile fraction(Test Method D2369)may bedetermined indirectly in the application of Practice D3960.Since preci-sion is better for the determination of the nonvolatile content,this is thepreferred method for the indirect calculation of water content in thismethod.The equations for calculating regulatory VOC content when noexempt volatile compounds are present are:VOC 5fVOCDP!1 21 2fNV2fVOC!DP DW!#(1)orVOC