1、Designation: D5029 98 (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.
2、 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 solu
3、bles 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 a
4、ddress 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 Speci
5、fication 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. Terminolog
6、y3.1 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 ex
7、traction 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
8、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
9、 that may be extracted from various activatedcarbons.6. Apparatus and MaterialsNOTE 1All 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
10、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, Ashl
11、ess, (;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
12、, 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.Cu
13、rrent 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
14、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 States16.17 Laboratory Timer.6.18 Filter Flasks, vacuum, 500 mL.7. Sampling7.1 C
15、onducted 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 Metho
16、d 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
17、 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 premoistenedwith the Typ
18、e II water used for the test. Catch the filtrate in a500-mL vacuum filter flask, being careful to prevent carbonfines from entering the filtrate.8.7 Cool the filtrate to ambient temperature. (The pH maybe measured on a portion of the filtrate.)8.8 Dry the glass or porcelain evaporating dishes at150
19、6 5C to a constant weight (60.1 mg). Evaporating dishesmust be cooled to ambient temperature and stored in adesiccator between weighings. Weigh the dry evaporating dishto the nearest 0.1 mg and record.8.9 Using a pipet, transfer a 50-mL aliquot of the filtrate toa tared glass or porcelain evaporatin
20、g dish.8.10 Evaporate the filtrate to dryness in an oven or on asteam bath until the liquid disappears. Avoid boiling to preventloss of residue.8.11 Dry the residue at 150 6 5C for a minimum of1handensure dryness to constant weight (60.1 mg). The evaporatingdish containing the residue must be cooled
21、 to ambient tem-perature and stored in a desiccator between weighings. Weighthe evaporating dish and residue to the nearest 0.1 mg andrecord.8.12 If the residue is less than 10 mg, repeat the procedure.Add the new aliquot during 8.9 to the evaporating dishcontaining residue from the previous aliquot
22、.8.13 Make two determinations on each carbon sampletested.9. Calculation9.1 The following equation is used for a general calculationof water solubles:Water Solubles, % 5B 2 A!D!100!C!E!(1)where:A = mass of evaporating dish, g,B = mass of evaporating dish plus residue, g,C = mass of carbon, g,D = vol
23、ume of water used in extraction, mL, andE = volume of aliquot used, mL.9.1.1 As an example, for extraction of one carbon sample,and evaporation of a 50-mL aliquot, the water solublescalculation is:Water Solubles, % 5RWCW320010. Report10.1 Report the following:10.1.1 Source of sample.10.1.2 Type or d
24、esignation of activated carbon.10.1.3 Supplier name.10.1.4 Supplier grade designation.10.1.5 Supplier lot and batch number.10.1.6 Moisture content in accordance with Test MethodD2867.10.1.7 Water solubles content.10.1.8 Date of test.10.1.9 Name and signature of technician performing test.10.1.10 Nam
25、e and signature of supervisor approving test.11. Precision and Bias11.1 Precision:11.1.1 RepeatabilityRepeatability of this test method is620 % of the average value from three or more determina-tions. This range corresponds to 2S % as defined in PracticeE177.11.1.2 ReproducibilityReproducibility for
26、 this test methodis 635 % (2S %) of the calculated value.11.1.3 These statements are based on a round robin trial ofthis test method on activated carbons from five different rawmaterial bases tested by four different laboratories.12. Keywords12.1 activated carbonD5029 98 (2014)2ASTM International ta
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30、he address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 98 (2014)3
