ASTM D2789-95
(Test Method)Standard Test Method for Hydrocarbon Types in Low Olefinic Gasoline by Mass Spectrometry
Standard Test Method for Hydrocarbon Types in Low Olefinic Gasoline by Mass Spectrometry
SCOPE
1.1 This test method covers the determination by mass spectrometry of the total paraffins, monocycloparaffins, dicycloparaffins, alkylbenzenes, indans or tetralins or both, and naphthalenes in gasoline having an olefin content of less than 3 volume % and a 95% distillation point of less than 210oC (411oF) as determined in accordance with Test Method D86. Olefins are determined by Test Method D1319, or by Test Method D875.
1.2 It has not beeen determined whether this test method is applicable to gasolines containing oxygenated compounds (for example, alcohols and ethers).
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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Designation: D 2789 – 95 An American National Standard
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Test Method for
Hydrocarbon Types in Low Olefinic Gasoline by Mass
1
Spectrometry
This standard is issued under the fixed designation D 2789; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope 3.1.1.1
1
1.1 This test method covers the determination by mass
(43 ~paraffins!5 total peak height of m/e 43 1 57 1 71 1 85 1 99.
(1)
spectrometry of the total paraffins, monocycloparaffins,
dicycloparaffins, alkylbenzenes, indans or tetralins or both, and
3.1.1.2
naphthalenes in gasoline having an olefin content of less than
1
(41 ~monocycloparaffins!5 total peak height of m/e 41 1 55 1 69
3 volume % and a 95 % distillation point of less than 210°C
1 83 1 97. (2)
(411°F) as determined in accordance with Test Method D 86.
3.1.1.3
Olefins are determined by Test Method D 1319, or by Test
1
Method D 875.
(67 ~dicycloparaffins!5 total peak height of m/e 67 1 68 1 81 1 82
1.2 It has not beeen determined whether this test method is
1 95 1 96 (3)
applicable to gasolines containing oxygenated compounds (for
.
example, alcohols and ethers).
3.1.1.4
1.3 This standard does not purport to address all of the
1
safety concerns, if any, associated with its use. It is the
(77 ~alkylbenzenes!5 total peak height of m/e 77 1 78 1 79 1 91
responsibility of the user of this standard to establish 1 92 1 105 1 106 1 119 1 120 1 133 1 134 1 147 1 148 1 161
1 162. (4)
appropriate safety and health practices and determine the
applicability of regulatory limitations prior to use.
3.1.1.5
1
(103 ~indans and tetralins!5 total peak height of m/e 103 1 104
2. Referenced Documents
1 117 1 118 1 131 1 132 1 145 1 146 1 159 1 160. (5)
2.1 ASTM Standards:
2
3.1.1.6
D 86 Test Method for Distillation of Petroleum Products
1
D 875 Test Method for Calculation of Olefins and
(128 ~naphthalenes!5 total peak height of m/e 128 1 141 6 142
Aromatics in Petroleum Distillates from Bromine Number
1 155 1 156. (6)
3
and Acid Absorption
3.1.1.7
D 1319 Test Method for Hydrocarbon Types in Liquid
2 T 5 total ion intensity 5 (41 1 (43 1 (67 1 (77 1 (103 1 (128.
Petroleum Products by Fluorescent Indicator Adsorption
(7)
D 2001 Test Method for Depentanization of Gasoline and
2
3.2 carbon number, by definition, is the average number of
Naphthas
carbon atoms in the sample.
D 2002 Test Methods for Isolation of Representative
3.3 A mass number with a plus sign as superscript is defined
Saturates Fraction from Low-Olefinic Petroleum
2 as the peak height associated with the same mass number.
Naphthas
4. Summary of Test Method
3. Terminology
4 4.1 Samples are analyzed by mass spectrometry, based on
3.1 Definitions of Terms Specific to This Standard:
the summation of characteristic mass fragments, to determine
3.1.1 The summations of characteristic mass fragments are
the concentration of the hydrocarbon types. The average
defined as follows:
number of carbon atoms of the sample is estimated from
spectral data. Calculations are made from calibration data
1
which are dependent upon the average number of carbon atoms
This test method is under the jurisdiction of ASTM Committee D-2 on
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee
of the sample. Results are expressed in liquid volume percent.
D02.04on Hydrocarbon Analysis.
Current edition approved Sept. 10, 1995. Published November 1995. Originally
5. Significance and Use
published as D 2789 – 69. Last previous edition, D 2789 – 90.
2
Annual Book of ASTM Standards, Vol 05.01. 5.1 A knowledge of the hydrocarbon composition of
3
Discontinued; see 1984 Annual Book of ASTM Standards, Vol 05.01.
gasoline process streams, blending stocks and finished motor
4
Equations in 3.1.1 are identical to those in 11.1.
1
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D 2789
fuels is useful in following the effect of changes in plant (Warning—see Note 4). Only reagent grade chemicals
operating conditions, diagnosing process upsets, blending conforming to the specifications of the Committee on
5
finished products and in evaluating the relationship between
Analytical Reagents of the American Chemical Society,
composition and performance properties.
National Institute of Standards and Technology (NIST)
standard hydrocarbon samples, or other hydrocarbons of equal
6. Apparatus
purity should be used.
6.1 Mass Spectrometer—Any mass spectrometer that passes
NOTE 4—Warning: Extremely flammable
...
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