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Designation: D7881 − 26Standard Test Method forDetermination of 4-Carboxybenzaldehyde and p -Toluic Acidin Purif i ed Terephthalic Acid by Capillary Electrophoresiswith Reverse Voltage Mode 1This standard is issued under the f i xed designation D7881; 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. Scope*1.1 This test method 2 covers the determination of4-carboxybenzaldehyde (4-CBA) and p-toluic acid (p-TOL) inpurif i ed terephthalic acid (PTA).1.2 This test method is applicable to samples with 4-CBAfrom 3 mg⁄kg to 400 mg⁄kg and for p-TOL from 8 mg⁄kg to400 mg⁄kg, respectively.1.3 The following applies for the purposes of determiningthe conformance of the test results using this test method toapplicable specif i cation, results shall be rounded off in accor-dance with the rounding-off method of Practice E29.1.4 The values stated in SI units are to be regarded asstandard. No other units of measurement are included in thisstandard.1.5 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, health, and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.6 This international 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) Committee.2. Referenced Documents2.1 ASTM Standards: 3D1193 Specif i cation for Reagent WaterD6809 Guide for Quality Control and Quality AssuranceProcedures for Aromatic Hydrocarbons and Related Ma-terialsE29 Practice for Using Signif i cant Digits in Test Data toDetermine Conformance with Specif i cationsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method2.2 ISO Documents: 4EN ISO 8213 Chemical Products for Industrial Use—Sampling Techniques—Solid Chemical Products in theForm of Particles Varying from Powders to Coarse Lumps2.3 Other Document: 5OSHA Regulations, 29 CFR paragraphs 1910.1000 and1910.12003. Terminology3.1 Def i nitions of Terms Specif i c to Reverse Voltage Mode inthis Standard:3.1.1 capillary electrophoresis, n—an electrophoretic tech-nique in which a sample is introduced into a 50 µm to 100 µmi. d. fused-silica capillary f i lled with electrolyte solution andsubjected to high voltage for separation.3.1.1.1 Discussion—Reverse voltage, with the cathode onthe injection side and the anode on the detection side, is appliedacross the capillary causing electrolyte and analytes to migratetowards the anode and through the capillary’s UV detector1 This test method is under the jurisdiction of ASTM Committee D16 onAromatic, Industrial, Specialty and Related Chemicals and is the direct responsi-bility of Subcommittee D16.02 on Oxygenated Aromatics.Current edition approved July 1, 2026. Published July 2026. Originally approvedin 2013. Last previous edition approved in 2020 as D7881 – 20 ?1 . DOI: 10.1520/D7881-26.2 This standard is based on SH/T 1687–2000 Purif i ed terephthalic acid forindustrial use—determination of 4-Carboxybenzaldehyde and p-Toluic Acid-Highperformance capillary electrophoresis (HPCE), copyright SINOPEC, 22 Chaoyang-men North Street, Chaoyang District, Beijing, China 100728. A copy of SH/T1687–2000 may be obtained from China Petrochemical Press, www.sinopec-press.com.3 For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at www.astm.org/contact. For Annual Book ofASTM Standards volume information, refer to the standard’s Document Summarypage on the ASTM website.4 Available from American National Standards Institute (ANSI), 1180 Avenue ofthe Americas, 10th Floor, New York, NY 10036, http://www.ansi.org.5 Available from U.S. Government Printing Office Superintendent of Documents,732 N. Capitol St., NW, Mail Stop: SDE, Washington, DC 20401, http://www.access.gpo.gov.*A Summary of Changes section appears at the end of this standardCopyright © 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 of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.1