1、Designation:D124014Standard Test Methods forRosin Acids Content of Pine Chemicals,Including Rosin,Tall Oil,and Related Products1This standard is issued under the fixed designation D1240;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision
2、,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 These test methods cover the determination of rosinacids in tall oil,tall oil fatty acid,tall oil rosin,and ot
3、her pinechemicals products.1.2 These test methods may not be applicable to adducts orderivatives of rosin,fatty acid,or other pine chemicals prod-ucts.1.3 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.4 This standard does no
4、t 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 ASTM Standards:2D
5、1585 Test Methods for Fatty Acids Content of NavalStores,Including Rosin,Tall Oil,and Related ProductsE70 Test Method for pH of Aqueous Solutions With theGlass ElectrodeE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE691 Practice for Conducting an Interlaboratory Study toDe
6、termine the Precision of a Test Method3.Summary of Test Method3.1 The rosin acids content is determined by one of twoprocedures;by selective esterification of fatty acids to formmethyl esters followed by titration of the unreacted rosin acids,by selective esterification of fatty acids to form butyl
7、estersfollowed by titration of the unreacted rosin acids.4.Significance and Use4.1 This is a revision of the method for measuring rosinacids content combines the three major ways of determiningthe rosin acids content of pine chemicals products into a singlemethod.4.1.1 For materials containing less
8、than 15%rosin,themodified Glidden procedure has gained acceptance.For mate-rials containing more than 15%rosin the modified WolfeMethod is preferred.The modified Wolfe and modified Gliddenprocedures differ only in their details.They have been com-bined here into a single procedure.This procedure can
9、 be runusing either a potentiometer or an internal indicator to deter-mine the end point of the titration.Use of a potentiometer ispreferred and is the referee method.Use of an internal indicatoris the principal alternative method.They will be referred to asthe Potentiometric Method and the Internal
10、 Indicator Method.5.Reagents5.1 Purity of ReagentsReagent grade chemicals shall beused in all tests.Unless otherwise indicated,it is intended thatall reagents shall conform to the specifications of the Commit-tee on Analytical Reagents of the American Chemical Societywhere such specifications are av
11、ailable.3Other grades may beused,provided it is first ascertained that the reagent is ofsufficiently high purity to permit its use without lessening theaccuracy of the determination.5.2 Unless otherwise indicated,references to water shall beunderstood to mean deionized or distilled water.6.Preparati
12、on of Sample6.1 Homogeneous liquid materials may be used withoutfurther preparation.1These test methods are under the jurisdiction of ASTM Committee D01 onPaint and Related Coatings,Materials,and Applications and are the directresponsibility of Subcommittee D01.34 on Pine Chemicals and HydrocarbonRe
13、sins.Current edition approved July 1,2014.Published August 2014.Originallyapproved in 1952.Last previous edition approved in 2012 as D1240 12.DOI:10.1520/D1240-14.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of
14、ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Reagent Chemicals,American Chemical Society Specifications,AmericanChemical Society,Washington,DC.For suggestions on the testing of reagents notlisted by the American Chemical Society,see Analar Standar
15、ds for LaboratoryChemicals,BDH Ltd.,Poole,Dorset,U.K.,and the United States Pharmacopeiaand National Formulary,U.S.Pharmaceutical Convention,Inc.(USPC),Rockville,MD.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 6.2 Nonhomogeneous liquid
16、 materials should be heateduntil they are homogeneous,then a portion taken for analysis.6.3 Solid samples are subject to surface oxidation whichmay affect the results.Prepare the sample for analysis bychipping small pieces from a freshly exposed surface of a lumpor lumps and crush to a coarse powder to facilitate weighingand solution.Prepare fresh on the same day,prior to weighing,in order to avoid changes due to surface oxidation of crushedrosin on exposure to the air.ROSIN ACIDS CONTENT BY THE