1、Designation:D837120Standard Test Method forTrace Metal Content Analysis in Carbon Black1This standard is issued under the fixed designation D8371;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 p
2、arentheses 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 metalcontent in carbon black with ICP-OES or ICP-MS afteradequate digestion.See 3.1.5 3.1.7 for definitio
3、ns.1.2 The concentration ranges covered by these test methodsare determined by the sensitivity of the instruments,theamount of sample taken for analysis and the dilution volume.1.3 Detection limits,sensitivity and optimum ranges of themetals will vary with the matrices and model of spectrometer.1.4
4、Elements present at concentrations above the linearresponse range of the calibration curve can be determined withadditional appropriate dilutions.1.5 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.6 This standard does not purp
5、ort 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.1.7 This international standard was
6、 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 Do
7、cuments2.1 ASTM Standards:2D1193 Specification for Reagent WaterD1506 Test Methods for Carbon BlackAsh ContentD7260 Practice for Optimization,Calibration,and Valida-tion of Inductively Coupled Plasma-Atomic EmissionSpectrometry(ICP-AES)for Elemental Analysis of Petro-leum Products and Lubricants3.Te
8、rminology3.1 Definitions:3.1.1 calibration,nthe process by which the relationshipbetween signal intensity and element concentration is deter-mined for a specific element analysis.3.1.2 calibration curve,nthe plot of signal intensity(onthe y axis)versus element concentration(on the x axis)using data
9、obtained from standards that contain certified tracemetal concentrations(calibration solutions),known with highaccuracy.3.1.3 calibration solution,nsolution containing mixtureof elements of known concentrations(multi element certifiedstandard solution).3.1.4 detection limit,nthe concentration of an
10、analyte thatresults in a signal intensity that is some multiple(typicallythree)times the standard deviation of the background intensityof the blank.3.1.5 ICP-MS,ninductively coupled plasma mass spec-trometry.3.1.6 ICP-OES,ninductively coupled plasma opticalemission spectrometry.3.1.7 inductively cou
11、pled plasma(ICP),na high tempera-ture discharge generated by flowing an ionizable gas through amagnetic field induced by a load coil that surrounds the tubescarrying the gas.3.1.8 linear response range,nthe elemental concentrationrange over which the calibration curve is a straight line,withinthe pr
12、ecision of the test method.3.1.9 secondary solution,ncalibration solution from asecond source.4.Summary of Test Method4.1 A sample of carbon black is digested either with strongacid under high temperature and pressure or after incinerationof the sample and acid treatment of the ash.By digestion,thet
13、race metals are transferred into their soluble salts,and most ofthe interfering matrix components,that is,carbon black,areremoved.1This test method is under the jurisdiction of ASTM Committee D24 on CarbonBlack and is the direct responsibility of Subcommittee D24.66 on Environment,Health,and Safety.
14、Current edition approved Dec.1,2020.Published January 2021.DOI:10.1520/D8371-20.2For 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
15、 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
16、 of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.4.2 The digestion solution is measured with an ICP-OES orICP-MS to quantify the trace metals of interest,after acalibration with a mix of elements in a certified standardreference solution.The concentrations of elements in the testspecimen are calculated by comparing emission intensities ofelements in the test specimen with emission intensities mea-sured in the
