1、Designation:D111084(Reapproved 2013)Technical Association of Pulp and Paper IndustryStandard Method T 207 om-81Standard Test Methods forWater Solubility of Wood1This standard is issued under the fixed designation D1110;the number immediately following the designation indicates the year oforiginal ad
2、option 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 These test methods2cover the determination of thewater solubility of wood.Two
3、 methods are given,as follows:1.1.1 Method ACold-Water SolubilityThis method pro-vides a measure of the tannins,gums,sugars,and coloringmatter in the wood.1.1.2 Method BHot-Water SolubilityThis method pro-vides a measure of the tannins,gums,sugars,coloring matter,and starches in the wood.1.2 This st
4、andard 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.2.Significance and Use2.1 Col
5、d water removes a part of such extraneous materialsas tannins,gums,sugars,and coloring matters.Hot waterremoves these plus the starches.METHOD ACOLD-WATER SOLUBILITY3.Apparatus3.1 Filtering CruciblesAlundum or fritted-glass cruciblesof coarse porosity will be required.3.2 Filtering FlaskA suction fi
6、ltering flask,equipped witha rubber flange for the crucible and funnel,shall be provided.4.Test Specimen4.1 The test specimen shall consist of 2 g of air-driedsawdust that has been ground to pass a 425-m sieve and beretained on a 250-m sieve.5.Procedure5.1 Place a 2-g test specimen,the moisture cont
7、ent of whichhas been previously determined,in a 400-mLbeaker,and coverwith 300 mL of distilled water.Let this mixture digest at atemperature of 23 6 2C,with frequent stirring,for 48 h.5.2 Filter the material on an Alundum or fritted-glasscrucible,using suction,wash with cold distilled water,and dryt
8、o constant weight at 100 to 105C.Drying usually requiresapproximately 4 h.Place the crucible in a loosely stopperedweighing bottle,cool in a desiccator,and weigh.6.Report6.1 Report the results as percentage of matter soluble in coldwater,on the moisture-free basis,calculated as follows:Cold water so
9、lubility,%5W12 W2!/W1#3100(1)where:W1=weight of moisture-free specimen used in 5.1,andW2=weight of dried specimen after extraction with coldwater(5.2).METHOD BHOT-WATER SOLUBILITY7.Apparatus7.1 Digestion ApparatusA 200-mL Erlenmeyer flask pro-vided with a reflux condenser shall be used.7.2 Water Bat
10、h,so constructed that the water can bemaintained at boiling temperature and at a constant-level justabove the solution in the flask.7.3 Filtering Crucible and Filtering FlaskSee Section 3.8.Test Specimen8.1 See Section 4.9.Procedure9.1 Place a 2-g test specimen,the moisture content of whichhas been
11、previously determined,and 100 mL of distilled waterin the Erlenmeyer flask and attach the reflux condenser.Placethe flask in the boiling water bath,with the solution in the flaskjust below the level of the water in the bath,and heat gently for3 h.1These test methods are under the jurisdiction of AST
12、M Committee D07 onWood and are the direct responsibility of D07.01 on Fundamental Test Methods andProperties.Current edition approved Aug.1,2013.Published September 2013.Originallyapproved in 1950.Last previous edition approved in 2007 as D1110 84(2007).DOI:10.1520/D1110-84R13.2For further informati
13、on on these test methods,the following references may beconsulted:Schorger,A.W.,“Chemistry of Cellulose and Woods,”1926,p.506,McGraw-Hill,NY.Hawley and Wise,“Chemistry of Wood,”1926,p.134,Chemical Catalog Co.,NY.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 1942
14、8-2959.United States1 9.2 Filter the contents of the flask on a tared Alundum orfritted-glass crucible,using suction,wash with hot water,anddry to constant weight at 100 to 105C.Place the crucible in aloosely stoppered weighing bottle,cool in a desiccator,andweigh.10.Report10.1 Report the results as
15、 percentage of matter soluble inhot water,on the moisture-free basis,calculated as follows:Hot water solubility,%5W12 W2!/W1#3100(2)where:W1=weight of moisture-free specimen used in 9.1,andW2=weight of dried specimen after extraction with hotwater(9.2).11.Precision and Bias311.1 All data obtained in
16、 one laboratory by testing 20woods.Repeatability,as Solubility,%Repeatability,%of SolubilityCold(1.1 to 6.3%)0.145.7Hot(1.6 to 9.0%)0.153.811.2 Reproducibility and bias are unknown.12.Keywords12.1 cold water solubility;hot water solubility;water solu-bilityASTM 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 determination of the validity of any such patent
