ASTM_D_6385_-_22.pdf

Designation:D638522Standard Test Method forDetermining Acid-Extractable Content in Activated Carbonby Ashing1This standard is issued under the fixed designation D6385;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 indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method is to be used for determination of theacid-extractable content of a sample of activated carbon.Thistest method presupposes the existence of substances other thancarbon to be present with activated carbon but does not purportto address or identify those substances which may be present.This test method should be applicable to any form in whichactivated carbon may exist and requires the performance ofTest Method D2866.1.2 This test method requires the use of concentratedhydrochloric acid,which should be used in an appropriate andsafe manner,with eye protection,skin protection,and handlingcarried out in a properly operating fume hood.The proper useof a muffle furnace is addressed in Test Method D2866.1.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.4 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 establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-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:2D1193 Specification for Reagent WaterD2866 Test Method for Total Ash Content of ActivatedCarbonD2867 Test Methods for Moisture in Activated CarbonE300 Practice for Sampling Industrial Chemicals3.Summary of Test Method3.1 The percent acid-extractable content of an activatedcarbon sample is determined by the difference between thepercent mass of total ash of a sample and the percent mass oftotal ash of a sample which has been acid extracted.4.Significance and Use4.1 The quantitative determination of acid-extractable con-tent is useful in evaluating activated carbon samples thatcontain acid-soluble impurities.These acid-soluble impuritiescan affect applications of activated carbon.4.2 Limitations of MethodHydrochloric acid is used inthis test method as the extracting acid.All elements orcompounds present in the activated carbon sample,which canbe acid extracted,are assumed to form water-soluble chloridesalts.Hydrochloric acid may not solubilize all impurities ofactivated carbon.5.Apparatus5.1 250 mL Glass Beakers or 125 mL Capacity BlockHeater Digestion Vessel,for boiling and drying the sample.5.2 Watch Glass,suitable for 250 mL beaker or 125 mLCapacity Block Heater Digestion Vessel.5.3 Graduated Cylinders,of 100 mL(TD)and 25 mL(TD)size.5.4 Buchner Vacuum Funnel,7cm ID or equivalent filteringdevice.5.5 Vacuum Filter Flask,with side arm,500 mL.5.6 Vacuum Filter Collar,for the above filter flask.5.7 Filter Paper,which is hardened,ashless paper,8micron pore size and 7 cm in diameter is recommended,or adiameter which matches the vacuum funnel.The paper will beashed with the carbon,so ashless paper is necessary.5.8 Drying Oven,maintained at 150 C 6 5 C.1This test method is under the jurisdiction of ASTM Committee D28 on LiquidPhase Evaluation.Current edition approved Sept.1,2022.Published October 2022.Originallyapproved in 1999.Last previous edition approved in 2017 as D6385 99(2017).DOI:10.1520/D6385-22.2For 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 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.15.9 Muffle Furnace,as specified in Test Method D2866.5.10 Porcelain Crucibles,as specified in Test MethodD2866.5.11 Desicator,containing indicating silica gel or any otherdesicant,which is effective in maintaining dryness of coolinghot crucibles or oven dried carbon samples.5.12 Balance,capable of measurement of 0.1 mg.5.13 Carbon Particle Size Reduction,a mortar and pestle,orany other means of systematically reducing activated carbon