ASTM D8207-18

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation:D8207 −18
Standard Test Method for
Determination of Metals in Purified Terephthalic Acid (PAT)
1
by Atomic Absorption (AA) Spectrometry
This standard is issued under the fixed designation D8207; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope D4790 Terminology ofAromatic Hydrocarbons and Related
Chemicals
1.1 This test method covers the determination of aluminum,
D6809 Guide for Quality Control and Quality Assurance
chromium, cobalt, titanium, iron, manganese, molybdenum,
Procedures for Aromatic Hydrocarbons and Related Ma-
sodium and nickel in purified terephthalic acid (PAT) by
terials
graphite furnace atomic absorption (GFAA) spectrometry. It is
E29 Practice for Using Significant Digits in Test Data to
applicable to PAT samples containing sodium, chromium,
Determine Conformance with Specifications
cobalt, titanium, manganese, molybdenum and nickel over
E177 Practice for Use of the Terms Precision and Bias in
0.004 mg/kg, and iron and aluminum over 0.054 mg/kg.
ASTM Test Methods
1.2 In determining the conformance of the test results using
E300 Practice for Sampling Industrial Chemicals
thismethodtoapplicablespecification,resultsshallberounded
E691 Practice for Conducting an Interlaboratory Study to
off in accordance with the rounding-off method of Practice
Determine the Precision of a Test Method
E29.
E1184 Practice for Determination of Elements by Graphite
Furnace Atomic Absorption Spectrometry
1.3 The values stated in SI units are to be regarded as
3
standard. No other units of measurement are included in this 2.2 Other Document:
OSHA Regulations, 29 CFR paragraphs 1910.1000 and
standard.
1910.1200
1.4 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
3. Summary of Test Method
responsibility of the user of this standard to establish appro-
3.1 PATsampleinaplatinumcrucibleisignitedandburned,
priate safety, health, and environmental practices and deter-
then ashed at 750°C approximately for 45 min in a muffle
mine the applicability of regulatory limitations prior to use.
furnace, and finally dissolved with sulfuric acid solution. The
Some specific hazards statements are given in 6.3, 6.10, 6.11,
sample solution is analyzed by graphite furnace atomic absorp-
Section , and 9.1.
tion spectrophotometer. The external standard calibration is
1.5 This international standard was developed in accor-
used for quantification.
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
4. Significance and Use
Development of International Standards, Guides and Recom-
4.1 The presence of metals in PAT used for the production
mendations issued by the World Trade Organization Technical
of polyester is undesirable because they may speed up or slow
Barriers to Trade (TBT) Committee.
down the reaction and be impurities in the final product.
2. Referenced Documents 4.2 Determination of metals in PAT is often required. This
2
test method is suitable for setting specifications and for use as
2.1 ASTM Standards:
an internal quality control tool where these products are
D1193 Specification for Reagent Water
produced or used.
5. Apparatus
1
This test method is under the jurisdiction of ASTM Committee D16 on
5.1 Atomic Absorption Spectrometer with Graphite
Aromatic, Industrial, Specialty and Related Chemicals and is the direct responsi-
bility of Subcommittee D16.02 on Oxygenated Aromatics. Furnace, having background correction capable of removing
Current edition approved June 1, 2018. Published August 2018. DOI: 10.1520/
nonspecific absorbance.
D8207-18.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
3
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Available from U.S. Government Printing Office, Superintendent of
Standards volume information, refer to the standard’s Document Summary page on Documents, 732 N. Capitol St., NW, Washington, DC 20401-0001, http://
the ASTM website. www.access.gpo.gov.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D8207−18
5.2 Hollow Cathode Lamps. 6.6 Multi-element Standard Stock Solution (1.0 mg/L)—
Pipette 1.0 mL of each single element standard solution (6.5)
5.3 Autosampler or Manual Pipettor.
into a 100 mL volumetric flask, m
...