Standard Test Method for Aromatic Types Analysis of Gas-Oil Aromatic Fractions by High Ionizing Voltage Mass Spectrometry

SIGNIFICANCE AND USE
A knowledge of the hydrocarbon composition of process streams and petroleum products boiling within the range 205 to 540°C (400 to 1000°F) is useful in following the effect of changes in process variables, diagnosing the source of plant upsets, and in evaluating the effect of changes in composition on product performance properties. This method, when used together with Test Method D2786, provides a detailed analysis of the hydrocarbon composition of such materials.
SCOPE
1.1 This test method covers the determination by high ionizing voltage, low resolution mass spectrometry of 18 aromatic hydrocarbon types and 3 aromatic thiophenotypes in straight run aromatic petroleum fractions boiling within the range from 205 to 540°C (400 to 1000°F) (corrected to atmospheric pressure). Samples must be nonolefinic, must contain not more than 1 mass % of total sulfur, and must contain not more than 5 % nonaromatic hydrocarbons. Composition data are in volume percent.
Note 1—Although names are given to 15 of the compound types determined, the presence of other compound types of the same empirical formulae is not excluded. All other compound types in the sample, unidentified by name or empirical formula, are lumped into six groups in accordance with their respective homologous series.  
1.2 The values stated in acceptable SI units are to be regarded as the standard. The values given in parentheses are provided for information purposes only.
1.3 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 and health practices and determine the applicability of regulatory limitations prior to use.

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Publication Date
30-Sep-2011
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ASTM D3239-91(2011) - Standard Test Method for Aromatic Types Analysis of Gas-Oil Aromatic Fractions by High Ionizing Voltage Mass Spectrometry
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D3239 − 91(Reapproved 2011)
Standard Test Method for
Aromatic Types Analysis of Gas-Oil Aromatic Fractions by
High Ionizing Voltage Mass Spectrometry
This standard is issued under the fixed designation D3239; 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 Gas-Oil Saturates Fractions by High Ionizing Voltage
2 Mass Spectrometry
1.1 This test method covers the determination by high
E137Practice for Evaluation of Mass Spectrometers for
ionizing voltage, low resolution mass spectrometry of 18
Quantitative Analysis from a Batch Inlet (Withdrawn
aromatic hydrocarbon types and 3 aromatic thiophenotypes in
1992)
straight run aromatic petroleum fractions boiling within the
range from 205 to 540°C (400 to 1000°F) (corrected to
3. Terminology
atmospheric pressure). Samples must be nonolefinic, must
contain not more than 1 mass% of total sulfur, and must
3.1 Definitions of Terms Specific to This Standard:
contain not more than 5% nonaromatic hydrocarbons. Com- 3.1.1 Characteristic Mass Summations— Classes I–VII:
position data are in volume percent.
3.1.2 Class I:
NOTE 1—Although names are given to 15 of the compound types
78 578192110611201.toend, polyisotopic (1)
(
determined, the presence of other compound types of the same empirical
formulae is not excluded. All other compound types in the sample,
191110511191.toend, monoisotopic
unidentified by name or empirical formula, are lumped into six groups in
accordance with their respective homologous series.
3.1.3 Class II:
1.2 The values stated in acceptable SI units are to be
104 51041118113211461.toend, polyisotopic (2)
(
regarded as the standard. The values given in parentheses are
provided for information purposes only.
1117113111451.toend, monoisotopic
1.3 This standard does not purport to address all of the
3.1.4 Class III:
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- 129 51301144115811721.toend, polyisotopic (3)
(
priate safety and health practices and determine the applica-
11291143115711711.toend, monoisotopic
bility of regulatory limitations prior to use.
3.1.5 Class IV:
2. Referenced Documents
128 51281142115611701.toend, polyisotopic (4)
(
2.1 ASTM Standards:
1141115511691.toend, monoisotopic
D2549Test Method for Separation of Representative Aro-
matics and Nonaromatics Fractions of High-Boiling Oils
3.1.6 Class V:
by Elution Chromatography
154 51541168118211961.toend, polyisotopic (5)
D2786Test Method for Hydrocarbon Types Analysis of
(
1167118111951.toend, monoisotopic
1 3.1.7 Class VI:
This test method is under the jurisdiction of ASTM Committee D02 on
Petroleum Products, Liquid Fuels, and Lubricantsand is the direct responsibility of
166 51661180119412081.toend, polyisotopic (6)
(
Subcommittee D02.04.0M on Mass Spectroscopy.
Current edition approved Oct. 1, 2011. Published October 2011. Originally
1179119312071.toend, monoisotopic
approved in 1973. Last previous edition approved in 2006 as D3239–91 (2006).
DOI: 10.1520/D3239-91R11.
3.1.8 Class VII:
Robinson, C. J., and Cook, G. L., Analytical Chemistry (ANCHA), Vol 41,
1969, p. 1548.
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 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
D3239 − 91 (2011)
6. Apparatus
178 51781192120612201.toend, polyisotopic (7)
(
6.1 Mass Spectrometer—The suitability of the mass spec-
1191120512191.toend, monoisotopic
trometer to be used with this method shall be proven by
3.1.9 Classes, Compound Types, Empirical Formulae—See
performance tests described both herein and in Practice E137.
Table 1.
6.2 Sample Inlet System—Anyinletsystemmaybeusedthat
permits the introduction of the sample without loss,
4. Summary of Test Method
contamination, or change in composition. The system must
4.1 The relative abundance of seven classes (I–VII) of
function in the range from 125 to 350°C to provide an
aromatics in petroleum aromatic fractions is determined by
appropriate sampling device.
mass spectrometry using a summation of peaks most charac-
6.3 Microburet or Constant-Volume Pipet.
teristic of each class. Calculations are carried out by the use of
6.4 Mass Spectrum Digitizer—It is recommended that a
a7by7invertedmatrixderivedfrompublishedspectraofpure
aromatic compounds. Each summation of peaks includes the mass spectrum digitizer be used in obtaining the analysis,
because it is necessary to use the heights of most of the peaks
polyisotopic homologous series that contains molecular ions
in the spectrum. Any digitizing system capable of supplying
and the monoisotopic homologous series one mass unit less
accurate mass numbers and peak heights is suitable.
than the molecular ion series. Using characteristic summations
found in the monoisotopic molecular ion—1 series of peaks,
6.5 Electronic Digital Computer—The computations for
eachclassisfurtherresolvedtoproviderelativeabundancesof
this analysis are not practical without the use of a computer.
three compound types: nominal (Type 0), first overlap (Type
Any computer capable of providing approximately 60K bytes
1), and second overlap (Type 2). The aromatic fraction is
in core and capable of compiling programs written in FOR-
obtained by liquid elution chromatography (see Test Method
TRAN IV should be suitable.
D2549).
7. Reagent
NOTE 2—Monoisotopic peaks heights are obtained by correcting the
polyisotopicheightsfornaturallyoccurringheavyisotopes,assumingthat
7.1 n-Hexadecane. (Warning—Combustible-Very harm-
only ions of C H to C H are present. This is not strictly accurate
n 2n+2 n 2−11
ful.)
for aromatics, but the errors introduced by such assumption are trivial.
5. Significance and Use 8. Calibration
8.1 Calibration equations in the computer program given in
5.1 Aknowledgeofthehydrocarboncompositionofprocess
streamsandpetroleumproductsboilingwithintherange205to Table 2 may be used directly provided the following proce-
dures are followed:
540°C (400 to 1000°F) is useful in following the effect of
changes in process variables, diagnosing the source of plant 8.1.1 Instrumental Conditions—Repeller settings are ad-
justed to maximize the m/e 226 ion of n-hexadecane. A
upsets, and in evaluating the effect of changes in composition
on product performance properties. This method, when used magnetic field is used that will permit a scan over the mass
together withTest Method D2786, provides a detailed analysis range from 78 to 700. An ionizing voltage of 70 eV and an
of the hydrocarbon composition of such materials. ionizing current in the range from 10 to 70 µA is used.
NOTE3—Theinstrumentconditionsandcalibrationequationsdescribed
in this method are based on the use of a 180° magnetic-deflection type
TABLE 1 Classes, Compound Types, and Empirical Formulae
mass spectrometer (CEC Model 21-103). Satisfactory results have been
Class Type Formula
obtainedwithsomeothermagneticdeflectioninstruments.Itisnotknown
I 0 alkylbenzenes, C H
n 2n-6
if the equations are suitable for use on all other mass spectrometer types.
I 1 benzothiophenes, C H S
n 2n-10
8.1.2 Computer Program—The FORTRAN program given
I 2 naphthenephenanthrenes,
C H
n 2n-20
in Table 2 contains all the equations for calculating the
II 0 naphthenebenzenes, C H
...

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