1、Designation:D286709(Reapproved 2014)Standard Test Methods forMoisture in Activated Carbon1This standard is issued under the fixed designation D2867;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
2、 parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 These test methods provide three procedures for thedeterminatio
3、n of the moisture content of activated carbon.Theprocedures may also be used to dry samples required for othertests.The oven-drying and moisture balance methods are usedwhen water is the only volatile material present and is insignificant quantities,and the activated carbon is not heat-sensitive(som
4、e activated carbons can ignite spontaneously attemperatures as low as 150C).The xylene-extraction methodis used when a carbon is known or suspected to be heatsensitive or to contain nonwater-miscible organic compoundsinstead of or in addition to water.The oven-drying methoddescribed in these test me
5、thods may be used as the referencefor development of instrumental techniques for moisture de-termination in activated carbon.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 standard does not purport to address all of
6、 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:2E177 Practice for Use of the
7、 Terms Precision and Bias inASTM Test MethodsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method3.Summary of Test Methods3.1 Oven-Drying Test MethodA sample of carbon is putinto a dry,closed capsule(of known weight)and weighedaccurately.The capsule is ope
8、ned and placed with the lid in apreheated oven.The sample is dried to constant weight thenremoved from the oven and with the capsule closed,cooled toambient temperature.The closed capsule is weighed againaccurately.The weight loss is expressed as a percentage of theweight of the original sample.3.2
9、Xylene-Extraction Test Method A known,accurateweight of carbon is put into a boiling flask.Aknown volume ofxylene is added to the flask and the flask then connected to awater trap.A hot plate is used to heat the xylene until boiling.The temperature is controlled to allow steady reflux.Refluxcontinue
10、s until no further water can be collected in the trap.The weight of water collected is expressed as a percentage ofthe weight of the original sample.3.3 Moisture Balance Test MethodA sample of activatedcarbon is placed in a moisture balance and the weight measuredaccurately.The sample is dried to co
11、nstant weight.The weightloss is expressed as a percentage of the weight of the originalsample.4.Significance and Use4.1 The moisture content of activated carbon is oftenrequired to define and express its properties in relation to thenet weight of the carbon.4.2 The moisture content of activated carb
12、on packed intypical shipping containers will usually increase during trans-portation and storage.Users of activated carbon in applicationswhere low moisture content is important should be aware ofthis effect.OVEN-DRYING METHOD5.Apparatus5.1 Moisture OvenMost commercial,electrically heated,forced-cir
13、culation drying ovens capable of temperature regu-lation between 145 and 155C may be used.5.2 Capsules with CoversLow-form glass weighingbottles with ground-glass stoppers or seamless metal boxes1These test methods are under the jurisdiction of ASTM Committee D28 onActivated Carbon and are the direc
14、t responsibility of Subcommittee D28.04 on GasPhase Evaluation Tests.Current edition approved July 1,2014.Published September 2014.Originallyapproved in 1970.Last previous edition approved in 2009 as D2867 09.DOI:10.1520/D2867-09R14.2For referenced ASTM standards,visit the ASTM website,www.astm.org,
15、orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 with covers may be used
16、.They should be as shallow aspossible,consistent with convenient handling.5.3 Desiccator.6.Materials6.1 DesiccantAnhydrous calcium chloride or other suit-able desiccant.7.Procedure for Activated Carbon Passing A No.50Sieve7.1 Dip out with a spoon or spatula from the sample bottlea 1 to 2-g representative sample.Put this into a predried taredcapsule with lid,close and weigh at once to the nearest 0.5 mg.The depth of the carbon in the capsule must not exceed 1.25cm.7.2 Remove the cover and place t
