1、Designation:D110796(Reapproved 2013)Technical Association of Pulp and Paper IndustryStandard Method T 204 os-76Standard Test Method forEthanol-Toluene Solubility of Wood1This standard is issued under the fixed designation D1107;the number immediately following the designation indicates the year ofor
2、iginal 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 covers the determination of theethanol-toluene solu
3、ble content of wood,which is a measure ofthe waxes,fats,resins,and oils,plus tannins and certain otherether-insoluble components.1.2 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 consult ande
4、stablish appropriate safety and health practices and deter-mine the applicability of regulatory limitations prior to use.Specific precautionary statements are given in 4.1.2.Significance and Use2.1 The ethanol-toluene extract of wood consists of thesoluble materials not generally considered part of
5、the woodpolymeric structure.They are primarily the waxes,fats,resins,and some gums,as well as some water-soluble substances.Theamounts are influenced by seasoning and drying.3.Apparatus3.1 Filtering Crucibles,Alundum or fritted-glass filteringcrucibles of coarse porosity.3.2 Extraction ApparatusA co
6、mpact form of Soxhlet ex-traction apparatus,with ground-glass joints,is preferable.Theapparatus shall consist of the following items:3.2.1 Soxhlet Extraction Flask,having a capacity of 250mL.3.2.2 Soxhlet Extraction Tube,45 to 50 mm in insidediameter,having a capacity to the top of the siphon ofappr
7、oximately 100 mL and a siphon tube approximately 55mm in height.Extraction tubes of these dimensions siphonmore rapidly than extractors with higher siphon tubes.3.2.3 Condenser,of the Hopkins inner-cooled type.4.Reagent4.1 Ethanol-Toluene SolutionMix 1.0 L absolute ethanoland 427 mL toluene.(Warning
8、Avoid inhalation of vaporsand contact with skin.)5.Test Specimen5.1 The test specimen shall consist of 2 g of air-driedsawdust that has been ground to pass a 425-m(40 mesh)sieveand be retained on a 250-m(60 mesh)sieve.6.Procedure6.1 Weigh two 2-g test specimens in tared Alundum orfritted-glass cruci
9、bles.Dry one specimen in an oven for 2 h at100 to 105C,then place in a loosely stoppered weighingbottle,cool in a desiccator,and weigh.Continue the drying for1-h periods until the weight is constant.Calculate the propor-tions of moisture-free sawdust in the air-dry specimen.6.2 Place the other speci
10、men in a Soxhlet extraction appa-ratus having a tared Soxhlet extraction flask.Set a small disk offine-mesh screen wire in the top of the crucible to prevent lossof specimen.Extract with 150 mL of ethanol-toluene solutionfor 6 to 8 h,keeping the liquid boiling briskly.This shouldprovide four to six
11、siphonings per hour.6.3 After evaporating the solvent from the extraction flask,dry the flask and contents in an oven for 1 h at 100 to 105C,cool in a dessicator,and weigh.Continue the drying until thereis no further loss in weight.7.Calculation and Report7.1 Report the results as weight percentage
12、of ethanol-toluene soluble matter in the moisture-free wood,calculated asfollows:Ethanol2 toluene soluble matter,%5W2/W1P!3100(1)where:W2=weight of dried extract,6.3,W1=weight of test specimen used in 6.2,andP=proportion of moisture-free wood in the air-dry speci-men(7.1).7.2 The results shall be ba
13、sed on the average of at least twodeterminations.1This test method is under the jurisdiction of ASTM Committee D07 on Woodand is the direct responsibility of Subcommittee D07.01 on Fundamental TestMethods and Properties.Current edition approved Aug.1,2013.Published September 2013.Originallyapproved
14、in 1950.Last previous edition approved in 2007 as D1107 96(2007).DOI:10.1520/D1107-96R13.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 8.Precision and Bias28.1 Data obtained in a round robin test involving fivelaboratories indicate a re
15、peatability of 11%and a reproduc-ibility of 20%.8.2 Bias is unknown.9.Keywords9.1 ethanol-toluene;woodASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard.Users of this standard are expressly advised that det
16、ermination 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 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 conside
