ASTM D7212-13(2018)
(Test Method)Standard Test Method for Low Sulfur in Automotive Fuels by Energy-Dispersive X-ray Fluorescence Spectrometry Using a Low-Background Proportional Counter
Standard Test Method for Low Sulfur in Automotive Fuels by Energy-Dispersive X-ray Fluorescence Spectrometry Using a Low-Background Proportional Counter
SIGNIFICANCE AND USE
5.1 This test method determines total sulfur in automotive fuels with a typical analysis time around 10 min per sample.
5.2 The quality of automotive fuel is related to the amount of sulfur present. Knowledge of sulfur level is necessary for processing purposes.
5.3 Sulfur level in automotive fuels affects performance characteristics and air quality. Federal, state, and local agencies regulate the level of sulfur in fuel delivered at the pump.
5.4 This test method can be referenced in specification documents to determine if the material meets the desired sulfur content.
5.5 If this test method is applied to petroleum matrices with significantly different composition to those used in the interlaboratory precision study, then the caution and recommendations in Section 6 should be observed when interpreting the results.
SCOPE
1.1 This test method specifies an energy-dispersive X-ray fluorescence (EDXRF) method for the determination of the total sulfur content of automotive fuels with a concentration range from 7 mg/kg to 50 mg/kg.
1.1.1 The pooled limit of quantitation of this test method as obtained by statistical analysis of interlaboratory test results is 7 mg/kg sulfur.
1.2 The values stated in SI units are to be regarded as the standard. The preferred concentration units are mg/kg sulfur.
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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.4 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
Relations
Standards Content (Sample)
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: D7212 − 13 (Reapproved 2018)
Standard Test Method for
Low Sulfur in Automotive Fuels by Energy-Dispersive X-ray
Fluorescence Spectrometry Using a Low-Background
1
Proportional Counter
This standard is issued under the fixed designation D7212; 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.
1. Scope D6299 Practice for Applying Statistical Quality Assurance
and Control Charting Techniques to Evaluate Analytical
1.1 This test method specifies an energy-dispersive X-ray
Measurement System Performance
fluorescence (EDXRF) method for the determination of the
D6300 Practice for Determination of Precision and Bias
total sulfur content of automotive fuels with a concentration
Data for Use in Test Methods for Petroleum Products and
range from 7 mg/kg to 50 mg/kg.
Lubricants
1.1.1 The pooled limit of quantitation of this test method as
D6792 Practice for Quality Management Systems in Petro-
obtained by statistical analysis of interlaboratory test results is
leum Products, Liquid Fuels, and Lubricants Testing
7 mg⁄kg sulfur.
Laboratories
1.2 The values stated in SI units are to be regarded as the
D7343 Practice for Optimization, Sample Handling,
standard. The preferred concentration units are mg/kg sulfur.
Calibration, and Validation of X-ray Fluorescence Spec-
1.3 This standard does not purport to address all of the
trometry Methods for Elemental Analysis of Petroleum
safety concerns, if any, associated with its use. It is the
Products and Lubricants
responsibility of the user of this standard to establish appro-
E29 Practice for Using Significant Digits in Test Data to
priate safety, health, and environmental practices and deter-
Determine Conformance with Specifications
mine the applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accor-
3. Terminology
dance with internationally recognized principles on standard-
3.1 Definitions of Terms Specific to This Standard:
ization established in the Decision on Principles for the
3.1.1 low background proportional counter, n—an X-ray
Development of International Standards, Guides and Recom-
proportional counter that can suppress the noise generated
mendations issued by the World Trade Organization Technical
when incident X rays are absorbed near the wall with resulting
Barriers to Trade (TBT) Committee.
incomplete charge collection.
2. Referenced Documents 3.1.1.1 Discussion—An electrode shield close to the wall
2
detects incomplete charge collection and associated electronic
2.1 ASTM Standards:
detection circuitry rejects those events. In comparison to
D4045 Test Method for Sulfur in Petroleum Products by
conventional proportional counters, this gives lower spectral
Hydrogenolysis and Rateometric Colorimetry
background and a lower limit of detection.
D4057 Practice for Manual Sampling of Petroleum and
Petroleum Products
4. Summary of Test Method
D4177 Practice for Automatic Sampling of Petroleum and
Petroleum Products
4.1 The sample is placed in the beam emitted from an X-ray
source with titanium target and primary filtration so that
excitation is by essentially monochromatic radiation of
1
This test method is under the jurisdiction of ASTM Committee D02 on
4.51 keV and virtually no background at 2.3 keV. A low
Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility of
background proportional counter measures the intensity of the
Subcommittee D02.03 on Elemental Analysis.
fluorescent sulfur K series intensity and argon K series inten-
Current edition approved July 1, 2018. Published August 2018. Originally
sity (from residual air) and the accumulated counts are com-
approved in 2006. Last previous edition approved in 2013 as D7212 – 13. DOI:
10.1520/D7212-13R18.
pared with counts from previously prepared calibration stan-
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
dards to obtain the sulfur concentration in mg/kg. If chlorine is
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
expected to be present in some samples then other regions of
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. the spectrum must be measured to provide compensation for
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