Standard Test Method for Methyl Hydrogen Content of Hydrocarbon Oils by High Resolution Nuclear Magnetic Resonance Spectroscopy

SIGNIFICANCE AND USE
5.1 Methyl hydrogen content is a key characteristic of hydrocarbon lubricating oils and can affect a variety of properties of the oil including its boiling range, viscosity, low temperature flow, and oxidation stability.  
5.2 The NMR procedure does not require calibration standards of known methyl hydrogen content and is applicable to a wide range of hydrocarbon lubricating oils that are completely soluble in chloroform at ambient temperature.
SCOPE
1.1 This test method covers the determination of the total methyl hydrogen content of unadditized base stock (lubricating oils) hydrocarbon oils that are completely soluble in chloroform at ambient temperature using high-resolution nuclear magnetic resonance (NMR) spectrometers.  
1.2 The reported units are mol percent methyl hydrogen atoms. For pulse Fourier transform (FT) spectrometers, the detection limit is typically 0.1 % mol hydrogen atoms. The interim precision is applicable in the range 20.5 % to 38.7 % mol methyl hydrogen.  
1.3 This method is applicable to samples containing  
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. Specific precautionary statements are given in 7.2 and 7.3.  
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.

General Information

Status
Published
Publication Date
31-Mar-2021
Current Stage
Ref Project

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ASTM D8383-21 - Standard Test Method for Methyl Hydrogen Content of Hydrocarbon Oils by High Resolution Nuclear Magnetic Resonance Spectroscopy
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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: D8383 − 21
Standard Test Method for
Methyl Hydrogen Content of Hydrocarbon Oils by High
1
Resolution Nuclear Magnetic Resonance Spectroscopy
This standard is issued under the fixed designation D8383; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope D5292Test Method for Aromatic Carbon Contents of Hy-
drocarbon Oils by High ResolutionNuclear Magnetic
1.1 This test method covers the determination of the total
3
Resonance Spectroscopy (Withdrawn 2018)
methylhydrogencontentofunadditizedbasestock(lubricating
D6299Practice for Applying Statistical Quality Assurance
oils) hydrocarbon oils that are completely soluble in chloro-
and Control Charting Techniques to Evaluate Analytical
form at ambient temperature using high-resolution nuclear
Measurement System Performance
magnetic resonance (NMR) spectrometers.
D6300Practice for Determination of Precision and Bias
1.2 The reported units are mol percent methyl hydrogen
Data for Use in Test Methods for Petroleum Products,
atoms. For pulse Fourier transform (FT) spectrometers, the
Liquid Fuels, and Lubricants
detection limit is typically 0.1% mol hydrogen atoms. The
E386Practice for Data Presentation Relating to High-
interim precision is applicable in the range 20.5% to 38.7%
Resolution Nuclear Magnetic Resonance (NMR) Spec-
3
mol methyl hydrogen.
troscopy (Withdrawn 2015)
1.3 Thismethodisapplicabletosamplescontaining<0.1%
3. Terminology
mol olefinic hydrogens.
3.1 Definitions of Terms Specific to This Standard:
1.4 The values stated in SI units are to be regarded as
3.1.1 methyl hydrogen, n—H-NMR signal in the spectral
standard. No other units of measurement are included in this
region of 0.1ppm to the valley at approximately 1ppm as a
standard.
percentage of total hydrogens.
1.5 This standard does not purport to address all of the
3.1.1.1 Discussion—NMR spectrometers meeting vendor
safety concerns, if any, associated with its use. It is the
specifications for signal to noise ratio and resolution are
responsibility of the user of this standard to establish appro-
acceptable as defined in 6.1.
priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use. 3.2 Definitions of chemical shift (reported in parts per
million (ppm)), internal reference, spectral width, and other
Specific precautionary statements are given in 7.2 and 7.3.
1.6 This international standard was developed in accor- NMR terminology used in this test method can be found in
Practice E386 or any suitable vendor recommended method to
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the convert to ppm.
Development of International Standards, Guides and Recom-
3.3 Chloroform-d refers to chloroform solvent in which
mendations issued by the World Trade Organization Technical
hydrogen is replaced by deuterium, the heavier isotope of
Barriers to Trade (TBT) Committee.
hydrogen. Chloroform-d is available from a variety of chemi-
cal and isotope suppliers (Test Method D5292).
2. Referenced Documents
2
2.1 ASTM Standards:
4. Summary of Test Method
D4057Practice for Manual Sampling of Petroleum and
1
4.1 Hydrogen ( H) nuclear magnetic resonance (NMR)
Petroleum Products
spectra are obtained on solutions of the sample in
chloroform-d, using a pulse FT high-resolution NMR spec-
1
This test method is under the jurisdiction of ASTM Committee D02 on
trometer.Tetramethylsilaneispreferredasaninternalreference
Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility of
Subcommittee D02.04.0F on Absorption Spectroscopic Methods. in these solvents for assigning the 0.0parts per million (ppm)
1
Current edition approved April 1, 2021. Published April 2021. DOI: 10.1520/
chemical shift position in the H spectra.
D8383-21.
2
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
3
Standards volume information, refer to the standard’s Document Summary page on The last approved version of this historical standard is referenced on
the ASTM website. www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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D8383 − 21
4.2 Themethylhydrogencontentofthesampleismeasured used, provided it is fi
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