1、Designation:D813017Standard Test Method forDetermination of Metals in Purified Terephthalic Acid(PTA)by Inductively Coupled Plasma Atomic EmissionSpectrometric Method1This standard is issued under the fixed designation D8130;the number immediately following the designation indicates the year oforigi
2、nal 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 determination of metalelements in purified
3、terephthalic acid(PTA)by inductivelycoupled plasma atomic emission spectrometry(ICP-AES).Thismethod is applicable to PTA samples containing sodium,chromium,cobalt,aluminum,titanium,potassium,magnesium,manganese,iron,nickel,molybdenum and cal-cium over 0.055 mg/kg,respectively.1.2 In determining the
4、conformance of the test results usingthis method to applicable specification,results shall be roundedoff in accordance with the rounding-off method of PracticeE29.1.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.4 This stand
5、ard 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,health and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.5 This internati
6、onal standard was 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)Committe
7、e.2.Referenced Documents2.1 ASTM Standards:2D1193 Specification for Reagent WaterD4790 Terminology of Aromatic Hydrocarbons and RelatedChemicalsD6809 Guide for Quality Control and Quality AssuranceProcedures for Aromatic Hydrocarbons and Related Ma-terialsD7111 Test Method for Determination of Trace
8、 Elements inMiddle Distillate Fuels by Inductively Coupled PlasmaAtomic Emission Spectrometry(ICP-AES)E29 Practice for Using Significant Digits in Test Data toDetermine Conformance with SpecificationsE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE691 Practice for Conductin
9、g an Interlaboratory Study toDetermine the Precision of a Test Method2.2 ISO Document:3EN ISO 8213 Chemical products for industrial useSampling techniquesSolid chemical products in theform of particles varying from powders to coarse lumps2.3 Other Document:4OSHA Regulations,29 CFR paragraphs 1910.10
10、00 and1910.12003.Summary of Test Method3.1 A PTA sample is dissolved in ammonium hydroxidesolution.Calibration standards are prepared by mixing metallicstandard materials in ammonium hydroxide solution.An inter-nal standard material is added to the calibration standards andthe sample solution to com
11、pensate for variations of testspecimen introduction efficiency.The calibration standards andthe sample solution are aspirated into the ICP-AES instrument.The concentrations of the elements in the sample solution arecalculated by comparing emission intensity ratios of the samplesolution and calibrati
12、on standards to the internal standard.4.Significance and Use4.1 The presence of metals in PTA used for the productionof polyester is undesirable because they may speed up or slowdown the reaction and be impurities in the final product.1This test method is under the jurisdiction of ASTM Committee D16
13、 onAromatic,Industrial,Specialty and Related Chemicals and is the direct responsi-bility of Subcommittee D16.02 on Oxygenated Aromatics.Current edition approved Aug.1,2017.Published September 2017.DOI:10.1520/D8130-17.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM
14、Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.4Available from U.S.Governm
15、ent Printing Office,Superintendent ofDocuments,732 N.Capitol St.,NW,Washington,DC 20401-0001,http:/www.access.gpo.gov.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with international
16、ly recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 4.2 Determination of the metals in PTA is often required.This test method is suitable for setting specifications and foruse as an internal quality control where these products areproduced or used.4.3 This test method covers the determination of sodium,chromi
