ASTM D7184-19

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
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Designation: D7184 − 15 (Reapproved 2019) D7184 − 19
Standard Test Method for
Ultra Low Nitrogen in Aromatic Hydrocarbons by Oxidative
Combustion and Reduced Pressure Chemiluminescence
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Detection
This standard is issued under the fixed designation D7184; 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.
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ε NOTE—Editorial changes were made throughout in June 2019.
1. Scope Scope*
1.1 This test method covers the determination of total nitrogen in aromatic hydrocarbons, such as benzene, toluene, and xylene.
1.2 This test method is applicable for samples containing nitrogen from 0.1 to 1.2 mg N/kg. For higher nitrogen concentrations
refer to Test Method D4629. With careful analytical technique, this method can be used to successfully analyze concentrations
below the current scope (see Appendix X1).
1.3 In determining the conformance of the test results using this method to applicable specifications; results shall be rounded
off in accordance with the rounding-off method of Practice E29.
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.5 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. For specific hazard statements, see Section 9.
1.6 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.
2. Referenced Documents
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2.1 ASTM Standards:
D3437 Practice for Sampling and Handling Liquid Cyclic Products
D4629 Test Method for Trace Nitrogen in Liquid Hydrocarbons by Syringe/Inlet Oxidative Combustion and Chemiluminescence
Detection
D6809 Guide for Quality Control and Quality Assurance Procedures for Aromatic Hydrocarbons and Related Materials
E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
2.2 Other Documents:
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OSHA Regulations, 29 CFR paragraphs 1910. 1000 and 1910.1200
3. Terminology
3.1 Definitions:
3.1.1 oxidative pyrolysis, n—a process in which a sample undergoes combustion in an oxygen rich environment at temperatures
greater than 900°C.
3.1.2 pyrolytic decomposition, n—combusting a compound to decompose it to carbon dioxide, water and elemental oxides.
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This test method is under the jurisdiction of ASTM Committee D16 on Aromatic, Industrial, Specialty and Related Chemicals and is the direct responsibility of
Subcommittee D16.04 on Instrumental Analysis.
Current edition approved June 1, 2019Nov. 1, 2019. Published June 2019November 2019. Originally approved in 2007. Last previous edition approved in 20152019 as
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D7184 – 15.D7184 – 15 (2019) . DOI: 10.1520/D7184-15R19E01.10.1520/D7184-19.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
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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 standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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D7184 − 19
3.1.3 reduced pressure chemiluminescence, n—a chemical reaction at pressure less than 760 mm mercury (Hg) in which light
is emitted.
4. Summary of Test Method
4.1 A specimen is introduced into a carrier gas stream, at a controlled rate, and incorporated into a high temperature furnace
(900 to 1150°C) where an excess of oxygen is added. Pyrolysis converts hydrocarbons in the specimen to carbon dioxide and water.
Organic nitrogen and inorganic nitrogen compounds, pr
...