1、Designation:D624710Standard Test Method forDetermination of Elemental Content of Polyolefins byWavelength Dispersive X-ray Fluorescence Spectrometry1This standard is issued under the fixed designation D6247;the number immediately following the designation indicates the year oforiginal adoption or,in
2、 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 a general procedure for thedetermination of elemental content in
3、polyolefins bywavelength-dispersiveX-rayfluorescence(WDXRF)spectrometry,in mass fraction ranges typical of those contrib-uted by additives,catalysts,and reactor processes.The ele-ments covered by this test method include fluorine,sodium,magnesium,aluminum,silicon,phosphorus,sulfur,calcium,titanium,c
4、hromium,and zinc in the composition ranges givenin Table 1.TABLE 1 Mass Fraction Ranges for Additive and Trace Elementsin PolyolefinsElementLowerLimit(mg/kg)UpperLimit(mg/kg)Fluorine100300Sodium25200Magnesium10600Aluminum40500Silicon301000Phosphorus5200Sulfur20200Calcium10300Titanium5200Chromium5100
5、Zinc1010001.1.1 This test method does not apply to polymers specifi-cally formulated to contain flame retardants including bromi-nated compounds and antimony trioxide.1.1.2 This test method does not apply to polymers formu-lated to contain high levels of compounds of vanadium,molybdenum,cadmium,tin,
6、barium,lead,and mercury be-cause the performance may be strongly influenced by spectralinterferences or interelement effects due to these elements.NOTE1Specific methods and capabilities of users may vary withdifferences in interelement effects and sensitivities,instrumentation andapplications softwa
7、re,and practices between laboratories.Developmentand use of test procedures to measure particular elements,mass fractionranges or matrices is the responsibility of individual users.NOTE2One general method is outlined herein;alternative analyticalpractices can be followed,and are attached in notes,wh
8、ere appropriate.1.2 The values stated in SI units are to be regarded as thestandard.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 de
9、termine the applica-bility of regulatory limitations prior to use.Specific precau-tionary statements are given in Section 10.NOTE3There is no known ISO equivalent to this standard.2.Referenced Documents2.1 ASTM Standards:2C1118 Guide for Selecting Components for Wavelength-Dispersive X-Ray Fluoresce
10、nce(XRF)Systems(With-drawn 2011)3D883 Terminology Relating to PlasticsD4703 Practice for Compression Molding ThermoplasticMaterials into Test Specimens,Plaques,or SheetsD6247 Test Method for Determination of Elemental Contentof Polyolefins by Wavelength Dispersive X-ray Fluores-cence SpectrometryE29
11、 Practice for Using Significant Digits in Test Data toDetermine Conformance with SpecificationsE135 Terminology Relating to Analytical Chemistry forMetals,Ores,and Related MaterialsE1361 Guide for Correction of Interelement Effects inX-Ray Spectrometric AnalysisE1601 Practice for Conducting an Inter
12、laboratory Study toEvaluate the Performance of an Analytical MethodE1621 Guide for Elemental Analysis by Wavelength Disper-sive X-Ray Fluorescence Spectrometry3.Terminology3.1 Definitions:1This test method is under the jurisdiction of ASTM Committee D20 on Plasticsand is the direct responsibility of
13、 Subcommittee D20.70 on Analytical Methods.Current edition approved Aug.1,2010.Published September 2010.Originallyapproved in 1998.Last previous edition approved in 2004 as D6247-98(2004).DOI:10.1520/D6247-10.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer
14、Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Consh
15、ohocken,PA 19428-2959.United States1 3.1.1 Definitions of terms applying to XRF and plasticsappear in Terminology E135 and Terminology D883,respec-tively.3.2 Definitions of Terms Specific to This Standard:3.2.1 elementused in this context,refers to any chemicalelement that can be determined by XRF;a
16、nd is often usedsynonymously with the term metal.3.2.2 infinite thicknessor critical thickness:the thicknessof specimen which,if increased,yields no increase in countrate of secondary(fluorescent)X-rays.This thickness varieswith secondary X-ray energy or wavelength.3.2.3 polyolefinused in this context,refers to polyethylene(PE)and polypropylene(PP)thermoplastics.4.Summary of Test Method4.1 The test specimen is compression molded or injectionmolded into a plaque having a clean,uniform surface.4.2