ASTM-D6730 2011

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D6730-01(2011) Standard Test Method for Determination of Individual Components in Spark Ignition Engine Fuels by 100–Metre Capillary (with Precolumn) High-Resolution Gas Chromatography

Published By	Publication Date	Number of Pages
ASTM	2011	55

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Categories: 75.160.20 - Liquid fuels, ASTM

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Description

ASTM D6730-01-Reapproved2011

Historical Standard: Standard Test Method for Determination of Individual Components in Spark Ignition Engine Fuels by 100–Metre Capillary (with Precolumn) High-Resolution Gas Chromatography

ASTM D6730

Scope

1.1 This test method covers the determination of individual hydrocarbon components of spark-ignition engine fuels and their mixtures containing oxygenate blends (MTBE, ETBE, ethanol, and so forth) with boiling ranges up to 225°C. Other light liquid hydrocarbon mixtures typically encountered in petroleum refining operations, such as blending stocks (naphthas, reformates, alkylates, and so forth) may also be analyzed; however, statistical data was obtained only with blended spark-ignition engine fuels.

1.2 Based on the cooperative study results, individual component concentrations and precision are determined in the range from 0.01 to approximately 30 mass %. The test method may be applicable to higher and lower concentrations for the individual components; however, the user must verify the accuracy if the test method is used for components with concentrations outside the specified ranges.

1.3 This test method also determines methanol, ethanol, t-butanol, methyl t-butyl ether (MTBE), ethyl t-butyl ether (ETBE), and t-amyl methyl ether (TAME) in spark ignition engine fuels in the concentration range from 1 to 30 mass %. However, the cooperative study data provided insufficient statistical data for obtaining a precision statement for these compounds.

1.4 Although a majority of the individual hydrocarbons present are determined, some co-elution of compounds is encountered. If this test method is utilized to estimate bulk hydrocarbon group-type composition (PONA), the user of such data should be cautioned that some error will be encountered due to co-elution and a lack of identification of all components present. Samples containing significant amounts of naphthenic (for example, virgin naphthas) constituents above n-octane may reflect significant errors in PONA-type groupings. Based on the gasoline samples in the interlaboratory cooperative study, this test method is applicable to samples containing less than 25 mass % of olefins. However, some interfering co-elution with the olefins above C₇ is possible, particularly if blending components or their higher boiling cuts such as those derived from fluid catalytic cracking (FCC) are analyzed, and the total olefin content may not be accurate. Annex A1 of this test method compares results of the test method with other test methods for selected components, including olefins, and several group types for several interlaboratory cooperative study samples. Although benzene, toulene, and several oxygenates are determined, when doubtful as to the analytical results of these components, confirmatory analyses can be obtained by using the specific test methods listed in the reference section.

1.4.1 Total olefins in the samples may be obtained or confirmed, or both, if necessary, by Test Method D1319 (volume %) or other test methods, such as those based on multidimentional PONA-type of instruments.

1.5 If water is or is suspected of being present, its concentration may be determined, if desired, by the use of Test Method D1744 or equivalent. Other compounds containing oxygen, sulfur, nitrogen, and so forth, may also be present, and may co-elute with the hydrocarbons. If determination of these specific compounds is required, it is recommended that test methods for these specific materials be used, such as Test Methods D4815 and D5599 for oxygenates, and Test Method D5623 for sulfur compounds, or equivalent.

1.6 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.7 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.

Keywords

detailed hydrocarbon analysis; DHA; gas chromotography; hydrocarbons; open tubular column; oxygenates; PIONA; PONA; Automotive engine fuels/oils; Calibration–petroleum analysis instrumentation; Column tests; Composition analysis–petroleum products; Detailed hydrocarbon analysis (DHA); ETBE (ethyl tert-butyl ether); Final column temperature; Gas chromatography (GC)–petroleum products; High-resolution gas chromatography (GC); Hydrocarbons (aromatic); MTBE (methyl tert-butylether); Open tubular column; Oxygenates; PONA (bulk hydrocarbon group-type composition); TAME (tert-amyl methylether)

ICS Code

ICS Number Code 75.160.20 (Liquid fuels)

DOI: 10.1520/D6730-01R11

PDF Catalog

PDF Pages	PDF Title
1	Scope Referenced Documents
2	Terminology Summary of Test Method Significance and Use Apparatus
3	Reagents and Materials Sampling
4	Preparation of Apparatus Split Injection Linearity TABLE 1
5	FIG. 1
6	Column Evaluation Optimization of Instrument Operating Conditions TABLE 2
7	FIG. 2 FIG. 3
8	Calibration FIG. 4 FIG. 5 FIG. 6 FIG. 7 FIG. 8 FIG. 9
9	Sample Analysis Procedure Calculation Report Precision and Bias TABLE 3
10	FIG. 10
11	Keywords FIG. 11
12	TABLE 4
13	A1. PROCEDURE FOR ADJUSTING THE SELECTIVITY OF A DHA METHYL SILICONE OPEN TUBULAR COLUMN A1.1 A1.2 A1.3 A1.4 A1.5 A1.6 A1.7 FIG. A1.1
14	A1.8 A1.9 FIG. A1.2 FIG. A1.3
15	FIG. A1.4
16	FIG. A1.5
17	FIG. A1.6
18	FIG. A1.7
19	FIG. A1.8
20	FIG. A1.9
21	FIG. A1.10
22	FIG. A1.11
23	FIG. A1.12
24	FIG. A1.13
25	FIG. A1.14
26	FIG. A1.15
27	FIG. A1.16
28	FIG. A1.17
29	TABLE A1.1
38	TABLE A1.2
50	TABLE A1.3
53	A1.10 TABLE A1.4
54	TABLE A1.5 TABLE A1.6 TABLE A1.7 TABLE A1.8
55	X1. BIBLIOGRAPHY X1.1 TABLE A1.9

Additional information

Standard Title	D6730-01(2011) Standard Test Method for Determination of Individual Components in Spark Ignition Engine Fuels by 100–Metre Capillary (with Precolumn) High-Resolution Gas Chromatography
Published Code	ASTM
Publication Date	2011
Pages Count	55
ICS Codes	75.160.20 - Liquid fuels