ASTM_C_1271_-_99_2012.pdf

Designation:C127199(Reapproved 2012)Standard Test Method forX-ray Spectrometric Analysis of Lime and Limestone1This standard is issued under the fixed designation C1271;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 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 X-ray emission spectromet-ric analysis of limestone,quicklime,hydrated lime,and hy-draulic lime using wavelength dispersive instruments.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 determine the applica-bility of regulatory limitations prior to use.Specific precau-tionary statements are given in Section 10.2.Referenced Documents2.1 ASTM Standards:2C25 Test Methods for Chemical Analysis of Limestone,Quicklime,and Hydrated LimeC50 Practice for Sampling,Sample Preparation,Packaging,and Marking of Lime and Limestone ProductsC51 Terminology Relating to Lime and Limestone(as usedby the Industry)E50 Practices for Apparatus,Reagents,and Safety Consid-erations for Chemical Analysis of Metals,Ores,andRelated MaterialsE135 Terminology Relating to Analytical Chemistry forMetals,Ores,and Related MaterialsE305 Practice for Establishing and Controlling AtomicEmission Spectrochemical Analytical CurvesE456 Terminology Relating to Quality and StatisticsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test MethodE1060 Practice for Interlaboratory Testing of Spectrochemi-cal Methods of Analysis(Withdrawn 1997)3E1361 Guide for Correction of Interelement Effects inX-Ray Spectrometric Analysis2.2 NIST Documents:4ANSI-NIST Handbook 114NIST Standards Catalog3.Terminology3.1 Definitions:3.1.1 emission spectroscopyunless otherwise specified,for definitions of terms used in this test method pertaining toemission spectroscopy,refer to Terminology E135.3.1.2 limeunless otherwise specified,for definitions ofterms used in this test method pertaining to lime,refer toTerminology C51.3.1.3 statisticalunless otherwise specified,for definitionsof terms used in this test method pertaining to statistics,referto Terminology E456.4.Summary of Test Method4.1 A briquetted powder specimen or a fused-glass diskspecimen is irradiated by a high-energy X-ray beam.Thesecondary X rays produced are dispersed by means of crystals,and the intensities are measured by suitable detectors atselected wavelengths.Data are collected based on the timerequired to reach a fixed number of counts,total count for afixed time,or integration of voltage for a fixed time.Concen-trations of the elements are determined by relating the mea-sured radiation of unknown specimens to analytical curvesprepared from reference materials of known composition.5.Significance and Use5.1 This procedure is suitable for manufacturing control andverifying that the product meets specifications.It providesrapid,multi-element determinations with sufficient accuracy toensure product quality and minimize production delays.Theanalytical performance data included may be used as a bench-mark to determine whether similar X-ray spectrometers pro-vide equivalent precision and accuracy,or whether the perfor-mance of a particular X-ray spectrometer has changed.1This test method is under the jurisdiction of ASTM Committee C07 on Limeand is the direct responsibility of Subcommittee C07.05 on Chemical Tests.Current edition approved Dec.1,2012.Published December 2012.Originallyapproved in 1994.Last previous edition approved in 2006 as C1271 99(2006).DOI:10.1520/C1271-99R12.2For 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.3The last approved version of this historical standard is referenced onwww.astm.org.4Available from National Institute of Standards and Technology(NIST),100Bureau Dr.,Stop 1070,Gaithersburg,MD 20899-1070,http:/www.nist.gov.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 6.Interferences6.1 Interelement effects or matrix effects may exist for someof the elements listed.One way to compensate for these effectsis to prepare a series of calibration curves to cover thedesignated concentration ranges.The composition of the speci-men being analyzed must match closely the composition of thereference materials used to prepare the calibration curve.Mathematical corrections,derived from empirical relationshipsor fundamental parameter calculations,may be used alterna-tively.Any of these are acceptable,provi