1、Designation:D286717Standard 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 parentheses indi
2、cates 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 two procedures for thedetermination of the moisture c
3、ontent of activated carbon.2Theprocedures may also be used to dry samples required for othertests.The oven drying method is used when water is the onlyvolatile material present and is in significant quantities,and theactivated carbon is not heat sensitive(some activated carbonscan ignite spontaneous
4、ly at temperatures as low as 150 C).The xylene extraction method is used when a carbon is knownor suspected to be heat sensitive or to contain nonwater-miscible organic compounds instead of or in addition to water.The oven drying method described in these test methods maybe used as the reference for
5、 development of instrumentaltechniques for moisture determination 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 thesafety concerns,if any,associated w
6、ith 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.1.4 This international standard was developed in accor-dance with internationally recognized principles on st
7、andard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:3E177 Practice for Use of the Terms Precision an
8、d 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 opened and placed with
9、 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 Xylene Extraction T
10、est MethodA known,accurateweight of carbon is put into a boiling flask.Aknown volume ofxylene is added to the flask and the flask is then connected toa water trap.Ahot plate is used to heat the xylene until boiling.The temperature is controlled to allow steady reflux.Refluxcontinues until no further
11、 water can be collected in the trap.The weight of water collected is expressed as a percentage ofthe weight of the original sample.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 T
12、he moisture content of activated carbon 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.1These test methods are under the jurisdiction of ASTM
13、Committee D28 onActivated Carbon and are the direct responsibility of Subcommittee D28.04 on GasPhase Evaluation Tests.Current edition approved July 1,2017.Published July 2017.Originally approvedin 1970.Last previous edition approved in 2014 as D2867 09(2014).DOI:10.1520/D2867-17.2The moisture balan
14、ce method has been used in industry when water is the onlyvolatile material present and is in significant quantities and when the activatedcarbon is not heat sensitive.A precision and bias statement for the moisture balancemethod has not been developed by ASTM.Values obtained using this techniquesho
15、uld be properly correlated to one of the documented methods described in thisstandard.3For 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
16、 onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 OVEN DRYING METHOD5.Apparatus5.1 Moisture OvenMost comme
