ASTM D4607-1994(2011) Standard Test Method for Determination of Iodine Number of Activated Carbon《测定活性碳碘值的标准试验方法》.pdf
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1、Designation: D4607 94 (Reapproved 2011)Standard Test Method forDetermination of Iodine Number of Activated Carbon1This standard is issued under the fixed designation D4607; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year o
2、f 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 relativeactivation level of unused or reactivated carbons by adsorp
3、tionof iodine from aqueous solution. The amount of iodineabsorbed (in milligrams) by1gofcarbon using test conditionslisted herein is called the iodine number.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
4、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. Specific hazardstatements are gi
5、ven in Section 7.2. Referenced Documents2.1 ASTM Standards:2C819 Test Method for Specific Surface Area of Carbon orGraphiteD1193 Specification for Reagent WaterD2652 Terminology Relating to Activated CarbonD2867 Test Methods for Moisture in Activated CarbonD3860 Practice for Determination of Adsorpt
6、ive Capacityof Activated Carbon by Aqueous Phase Isotherm Tech-niqueE11 Specification for Woven Wire Test Sieve Cloth and TestSievesE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE287 Specification for Laboratory Glass Graduated BuretsE288 Specification for Laboratory Glass
7、 Volumetric FlasksE300 Practice for Sampling Industrial Chemicals2.2 NIST Publication:Circular 602Testing of Glass Volumetric Apparatus33. Summary of Test Method3.1 This test method is based upon a three-point adsorptionisotherm (see Practices D3860). A standard iodine solution istreated with three
8、different weights of activated carbon underspecified conditions. The carbon treated solutions are filtered toseparate the carbon from the treated iodine solution (filtrate).Iodine remaining in the filtrate is measured by titration. Theamount of iodine removed per gram of carbon is determinedfor each
9、 carbon dosage and the resulting data used to plot anadsorption isotherm. The amount of iodine adsorbed (inmilligrams) per gram of carbon at a residual iodine concentra-tion of 0.02 N is reported as the iodine number.3.2 Iodine concentration in the standard solution affects thecapacity of an activat
10、ed carbon for iodine adsorption. There-fore, the normality of the standard iodine solution must bemaintained at a constant value (0.100 6 0.001 N) for all iodinenumber measurements.3.3 The apparatus required consists of various laboratoryglassware used to prepare solutions and contact carbon with th
11、estandard iodine solution. Filtration and titration equipment arealso required.4. Significance and Use4.1 The iodine number is a relative indicator of porosity inan activated carbon. It does not necessarily provide a measureof the carbons ability to absorb other species. Iodine numbermay be used as
12、an approximation of surface area for sometypes of activated carbons (see Test Method C819). However,it must be realized that any relationship between surface areaand iodine number cannot be generalized. It varies withchanges in carbon raw material, processing conditions, andpore volume distribution
13、(see Definitions D2652).4.2 The presence of adsorbed volatiles, sulfur; and waterextractables may affect the measured iodine number of anactivated carbon.5. ApparatusNOTE 1All volumetric measuring equipment should meet or exceedthe requirements of NIST Circular 602. Volumetric glassware meeting1This
14、 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 March 1, 2011. Published May 2011. Originallyapproved in 1986. Last previous edition approved in 2006 as D4607 94
15、 (2006).DOI: 10.1520/D4607-94R11.2For 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.3Available from National Ins
16、titute of Standards and Technology (NIST), 100Bureau Dr., Stop 1070, Gaithersburg, MD 20899-1070, http:/www.nist.gov.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.these specifications is generally designated as “Class A”. See alsoS
17、pecifications E287 and E288.5.1 Analytical Balance, accuracy 60.0001 g.5.2 Buret, 10-mL capacity or 5-mL precision buret.5.3 Flasks, Erlenmeyer 250-mL capacity with ground glassstoppers.5.4 Flask, Erlenmeyer wide-mouthed, 250-mL capacity.5.5 Beakers, assorted sizes.5.6 Bottles, amber, for storage of
18、 iodine and thiosulfatesolutions.5.7 Funnels, 100-mm top inside diameter.5.8 Filter Paper, 18.5-cm prefolded paper, Whatman No.2V or equivalent.5.9 Pipets, volumetric type, 5.0, 10.0, 25.0, 50.0, and100.0-mL capacity.5.10 Volumetric Flasks,1L.5.11 Graduated Cylinders, 100 mL and 500 mL.6. Reagents6.
19、1 Purity of ReagentsReagent grade chemicals shall beused in all tests. Unless otherwise indicated, it is intended thatall reagents shall conform to the specifications of the Commit-tee on Analytical Reagents of the American Chemical Society,where such specifications are available.4Other grades may b
20、eused, provided it is first ascertained that the reagent is ofsufficiently high purity to permit its use without lessening theaccuracy of the determination.6.2 Purity of WaterReferences to water shall be under-stood to mean reagent water conforming to SpecificationD1193 for Type II reagent water.6.3
21、 Hydrochloric Acid, concentrated.6.4 Sodium Thiosulfate, (Na2S2O35H2O).6.5 Iodine, United States Pharmacopeia, resublimed crys-tals.6.6 Potassium Iodide.6.7 Potassium Iodate, primary standard.6.8 Starch, soluble potato or arrowroot.6.9 Sodium Carbonate.7. Hazards7.1 Several potential hazards are ass
22、ociated with conductingthis test procedure. It is not the purpose of this standard toaddress all potential health and safety hazards encounteredwith its use. The user is responsible for establishing appropri-ate health and safety practices before use of this test procedure.Determine the applicabilit
23、y of federal and state regulationsbefore attempting to use this test method.7.2 Personnel conducting the iodine number procedureshould be aware of potential safety and health hazards associ-ated with the chemicals used in this procedure. The “MaterialSafety Data Sheet” (MSDS) for each reagent listed
24、 in Section6 should be read and understood. Special precautions to betaken during use of each reagent are included on the “MaterialSafety Data Sheet” (MSDS). First aid procedures for contactwith a chemical are also listed on its “MSDS.” A “MaterialSafety Data Sheet” for each reagent may be obtained
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