ASTM_D_5029_-_98_2014.pdf

Designation:D502998(Reapproved 2014)Standard Test Method forWater Solubles in Activated Carbon1This standard is issued under the fixed designation D5029;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 covers the determination of the watersoluble content of(unused)granular and powdered activatedcarbons.Water solubles are materials that can be extracted bydistilled water under reflux conditions and are expressed as apercentage of dry carbon weight.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 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:2D1193 Specification for Reagent WaterD2652 Terminology Relating to Activated CarbonD2867 Test Methods for Moisture in Activated CarbonD3838 Test Method for pH of Activated CarbonE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE300 Practice for Sampling Industrial Chemicals3.Terminology3.1 Definitions Terms relating to this standard are definedin Terminology D2652.4.Summary of Test Method4.1 A known weight of activated carbon is placed into areflux apparatus with Type II reagent water(see SpecificationD1193).The mixture is refluxed for 15 min under specifiedconditions.This extraction is performed using the method andapparatus described in Test Method D3838.After extraction,the carbon is separated by filtration and an aliquot of the filtrateis evaporated to dryness.Water solubles are determined byweighing the dry residue and expressing the result as apercentage of the dry carbon weight.5.Significance and Use5.1 In certain applications,the ash,color,conductivity,orpH of the finished activated carbon product may be influencedby the quantity of water solubles it contains.This watersolubles test provides a relative indication of the quantity ofsoluble materials that may be extracted from various activatedcarbons.6.Apparatus and MaterialsNOTE1All volumetric measuring equipment should meet or exceedthe requirements of National Institute of Standards and TechnologyCircular 602,Testing of Glass Volumetric Apparatus,available from theNational Institute of Standards and Technology,Gaithersburg,MD 20899.Volumetric glassware meeting these specifications is generally designatedas Class A.6.1 Flask,250 mL with 24/40 ST(standard taper)neck.6.2 Condenser,with 24/40 inner ST(standard taper)joint.6.3 Buchner Funnel,9 or 12.5 cm.6.4 Filter Paper,Ashless,(;5 to 10 m particle retention).6.5 Glass or Porcelain Evaporating Dishes,100 mL capac-ity.6.6 Analytical Balance,precision 0.1 mg.6.7 Drying Oven.6.8 Desiccator.6.9 Hot Plate.6.10 Pipet,50 mL.6.11 Indicating Desiccant.6.12 Water,ASTM Type II or better,in accordance withSpecification D1193,Type II.6.13 Thermometer,approximately 20 to 55C.6.14 Steam Bath,optional.6.15 Beakers,250 mL.6.16 Graduated Cylinder,100 mL.1This test method is under the jurisdiction of ASTM Committee D28 onActivated Carbon and is the direct responsibility of Subcommittee D28.02 on LiquidPhase Evaluation.Current edition approved July 1,2014.Published September 2014.Originallyapproved in 1989.Last previous edition approved in 2009 as D5029 98(2009).DOI:10.1520/D5029-98R14.2For 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 States1 6.17 Laboratory Timer.6.18 Filter Flasks,vacuum,500 mL.7.Sampling7.1 Conducted sampling according to Practice E300.8.Procedure8.1 Determine the moisture content of the carbon in accor-dance with Test Method D2867.8.2 Weigh a sample of carbon equivalent to 10.00 6 0.01 gon a dry basis.Remove boiler flask from apparatus(seeBoiler-Reflux Condenser Figure in Test Method D3838)andadd carbon sample.8.3 Bring approximately 110 mL of reagent water to a boil.Measure 100.0 6 0.5 mL into a graduated cylinder while thewater is hot.Add a small portion of the 100.0 6 0.5 mL ofwater to wet the carbon.Wash down the sides of the flask withthe remaining portion.Connect the flask to the condenser andplace on a hot plate.8.4 Bring the water to a gentle boil to ensure that no carbonsplashes onto the side of the flask.8.5 Boil gently for 900 6 10 s.8.6 Remove the flask from the hot plate and filter itscontents immediately through the filter paper premoi