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ASTM D8063-18

(Test Method)

Standard Test Method for Water in Purified Terephthalic Acid (PTA) by Volumetric Karl Fischer Titration

Standard Test Method for Water in Purified Terephthalic Acid (PTA) by Volumetric Karl Fischer Titration

SIGNIFICANCE AND USE
4.1 The presence of water in PTA used for the production of polyester is undesirable because it reduces the purity of the PTA.  
4.2 Determining the amount of water content remaining from the manufacture of PTA is often required. This test method is suitable for setting product specifications and for use as an internal quality control tool where these products are produced or are used.
SCOPE
1.1 This test method covers the determination of water in purified terephthalic acid (PTA) between 0.01 and 1.00 % (w/w) by Volumetric Karl Fischer Titration.  
1.2 In determining the conformance of the test results using this method to applicable specification, results shall be rounded off in accordance with the rounding-off method of Practice E29.  
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.5 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.

General Information

Status
Published
Publication Date
31-Dec-2017
ICS
13.060.50 - Examination of water for chemical substances
71.040.40 - Chemical analysis
Technical Committee
D16 - Aromatic, Industrial, Specialty and Related Chemicals
Drafting Committee
D16.02 - Oxygenated Aromatics
Current Stage
Ref Project

Relations

Refers
ASTM D6809-02(2016) - Standard Guide for Quality Control and Quality Assurance Procedures for Aromatic Hydrocarbons and Related Materials
Effective Date
01-Nov-2016
Refers
ASTM D4790-14 - Standard Terminology of Aromatic Hydrocarbons and Related Chemicals
Effective Date
01-Jul-2014
Referred By
ASTM D8062-23 - Standard Specification for Purified Terephthalic Acid (PTA) with Low <emph type="ital" >p</emph>-Toluic Acid
Effective Date
01-Jan-2018

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ASTM D8063-18 - Standard Test Method for Water in Purified Terephthalic Acid (PTA) by Volumetric Karl Fischer TitrationASTM D8063-18 - Standard Test Method for Water in Purified Terephthalic Acid (PTA) by Volumetric Karl Fischer Titration
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ASTM D8063-18 - Standard Test Method for Water in Purified Terephthalic Acid (PTA) by Volumetric Karl Fischer Titration
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Standards Content (Sample)

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:D8063 −18
Standard Test Method for
Water in Purified Terephthalic Acid (PTA) by Volumetric Karl
1
Fischer Titration
This standard is issued under the fixed designation D8063; 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 Determine Conformance with Specifications
E177 Practice for Use of the Terms Precision and Bias in
1.1 This test method covers the determination of water in
ASTM Test Methods
purified terephthalic acid (PTA) between 0.01 and 1.00 %
E203 Test Method for Water Using Volumetric Karl Fischer
(w⁄w) by Volumetric Karl Fischer Titration.
Titration
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. 3
2.2 Other Document:
OSHA Regulations, 29 CFR paragraphs 1910.1000 and
1.3 The values stated in SI units are to be regarded as
standard. No other units of measurement are included in this 1910.1200
standard.
3. Summary of Test Method
1.4 This standard does not purport to address all of the
3.1 A PTA sample is dissolved in a solvent (mixture of
safety concerns, if any, associated with its use. It is the
methanolandpyridine,intherangeof30~35 %methanoland
responsibility of the user of this standard to establish appro-
70 ~ 65 % pyridine) and titrated with Karl Fischer reagent,
priate safety, health, and environmental practices and deter-
which consists of iodine, sulfur dioxide, methanol and an
mine the applicability of regulatory limitations prior to use.
organic base.
1.5 This international standard was developed in accor-
dance with internationally recognized principles on standard- 3.2 In the Karl Fischer reaction, water will react with iodine
ization established in the Decision on Principles for the according to the following equation:
Development of International Standards, Guides and Recom-
H O1I 1SO 13RN1CH OH→2RNHI1RNHSO CH
2 2 2 3 4 3
mendations issued by the World Trade Organization Technical
3.3 The volume of Karl Fischer reagent consumed to titrate
Barriers to Trade (TBT) Committee.
the sample is converted into the amount of water in the test
PTA sample.
2. Referenced Documents
2
4. Significance and Use
2.1 ASTM Standards:
D1193 Specification for Reagent Water
4.1 The presence of water in PTAused for the production of
D4790 Terminology ofAromatic Hydrocarbons and Related
polyester is undesirable because it reduces the purity of the
Chemicals
PTA.
D6809 Guide for Quality Control and Quality Assurance
4.2 Determining the amount of water content remaining
Procedures for Aromatic Hydrocarbons and Related Ma-
from the manufacture of PTA is often required. This test
terials
method is suitable for setting product specifications and for use
E29 Practice for Using Significant Digits in Test Data to
as an internal quality control tool where these products are
produced or are used.
1
This test method is under the jurisdiction of ASTM Committee D16 on
5. Interference
Aromatic, Industrial, Specialty and Related Chemicals and is the direct responsi-
bility of Subcommittee D16.02 on Oxygenated Aromatics. 5.1 Certain compounds or classes of compounds interfere
Current edition approved Jan. 1, 2018. Published May 2018. DOI: 10.1520/
with the accurate determination of water by the Karl Fischer
D8063-18.
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 ----------------------
D8063−18
NOTE1—Ifwatercontentinpyridineormethanolishigherthan0.05 %,
test method. They include aldehydes, ketones, free halogens,
50 g 5A may be added to 500 mL pyridine or methanol for desiccation.
ferric salts and strong oxidizing and reducing agents.
8. Hazards
6. Apparatus
8.1 Consult current federal regulations, supplier’s Safety
6.1 Karl Fischer Volumetric Titrator, consisting of a titra
...

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1.1 This test method2 is an analytical procedure using transmission electron microscopy (TEM) for the determination of the concentration of asbestos structures in ambient atmospheres and includes measurement of the dimension of structures and of the asbestos fibers found in the structures from which aspect ratios are calculated.  
1.1.1 This test method allows determination of the type(s) of asbestos fibers present.  
1.1.2 This test method cannot always discriminate between individual fibers of the asbestos and non-asbestos analogues of the same amphibole mineral.  
1.2 This test method is suitable for determination of asbestos in both ambient (outdoor) and building atmospheres.  
1.2.1 This test method is defined for polycarbonate capillary-pore filters or cellulose ester (either mixed esters of cellulose or cellulose nitrate) filters through which a known volume of air has been drawn and for blank filters.  
1.3 The upper range of concentrations that can be determined by this test method is 7000 s/mm2. The air concentration represented by this value is a function of the volume of air sampled.  
1.3.1 There is no lower limit to the dimensions of asbestos fibers that can be detected. In practice, microscopists vary in their ability to detect very small asbestos fibers. Therefore, a minimum length of 0.5 μm has been defined as the shortest fiber to be incorporated in the reported results.  
1.4 The direct analytical method cannot be used if the general particulate matter loading of the sample collection filter as analyzed exceeds approximately 10 % coverage of the collection filter by particulate matter.  
1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropri...

  • Standard
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  • Standard
    33 pages
    English language
    sale 15% off