1、Designation:D738513Standard Guide forEstimating Carbon Saturation by Temperature Rise uponImmersion1This standard is issued under the fixed designation D7385;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A
2、 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 guide covers the measurement of the temperaturerise resulting from the heat of immersion when a known massof a specified organic liqu
3、id is added to a sample of activatedcarbon.If the carbon has been in use as an adsorbent and maytherefore be partially or fully exhausted,its degree of satura-tion may be estimated by comparing its temperature rise withthat of an unused sample of the same activated carbon.1.2 The values stated in SI
4、 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 prac
5、tices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D2652 Terminology Relating to Activated CarbonD2854 Test Method for Apparent Density of ActivatedCarbonD2867 Test Methods for Moisture in Activated CarbonE300 Practice for Sampling
6、 Industrial Chemicals3.Terminology3.1 Terms related to this guide are defined in TerminologyD2652.4.Summary of Guide4.1 A measured volume of activated carbon is added to aknown volume of a selected organic liquid in a containerprovided with means to measure the liquid temperature.Theapparatus is sea
7、led after the addition of the carbon and themaximum rise in temperature is recorded.The degree ofsaturation of a used carbon is estimated by comparing itstemperature rise with that of the original unused activatedcarbon of equivalent moisture content,measured under thesame conditions.If no such refe
8、rence sample is available,acommercial unused activated carbon of the same physical typefrom a reputable manufacturer may be substituted;suchsubstitution should be noted in the report.5.Significance and Use5.1It is often useful to estimate the degree of saturation,and hence the expected remaining ser
9、vice life,of activatedcarbon that has been in use for some time.This guide isapplicable when such information must be obtained fairlyrapidly under field conditions without access to optimal ana-lytical instruments.36.Apparatus and Materials6.1 ApparatusThe apparatus should consist of a containersuch
10、 as a small bottle or flask to accommodate the carbon,theorganic liquid,and a thermometer or thermocouple with arange to allow for a temperature rise of up to about 30 C,graduated in intervals of 0.5 C,with facility to interpolate to60.1 C.A liquid-in-glass thermometer should not usemercury,because
11、of the greater risk of breakage under fieldconditions.The container should be provided with a rubberstopper or other suitable closure to seal the contents after thecarbon has been added to the organic liquid.Appropriatecontainers include an Erlenmeyer or Florence flask of about125 to 250 mL capacity
12、 or a similar-sized narrow-neckedbottle.6.2 MaterialsMany organic liquids that are insoluble inwater but readily soluble in other adsorbates that may alreadybe on the carbon are potentially useful.Those that have beentried include mineral oil,hexane,cyclohexane,and kerosene.Mineral oil is essentiall
13、y harmless and not readily flammable,so its use does not require warnings for personnel untrained inhandling laboratory chemicals,but it has the disadvantage of1This guide is under the jurisdiction of ASTM Committee D28 on ActivatedCarbonand is the direct responsibility of Subcommittee D28.04 on Gas
14、 PhaseEvaluation Tests.Current edition approved Sept.1,2013.Published September 2013.Originallyapproved in 2007.Last previous edition approved in 2007 as D7385 07.DOI:10.1520/D7385-13.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.or
15、g.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3H.W.Stone and R.O.Clinton,Ind.Eng.Chem.,Anal.Ed.,14,131(1942)Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 high visco
16、sity,which may inhibit rapid mixing with the carbon.Mineral oil and kerosene are mixtures,not pure chemicals,sothey are best suited for comparative results when samples fromthe same batch are used.Commercial hexane is also impure,but small differences in adsorptivity among its isomers may notseriously affect the precision of the method.Cyclohexanegenerally contains fewer isomers and may be used instead.7.Procedure7.1 The procedure applies to unimpregnated activated car-bon with a moisture conten
