ASTM D7212-07

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
This test method determines total sulfur in automotive fuels with a typical analysis time around 10 min per sample.
The quality of automotive fuel is related to the amount of sulfur present. Knowledge of sulfur level is necessary for processing purposes.
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.
This test method can be referenced in specification documents to determine if the material meets the desired sulfur content.
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 and health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 30-Apr-2007
• ICS: 75.160.20 - Liquid fuels
• Technical Committee: D02 - Petroleum Products, Liquid Fuels, and Lubricants
• Drafting Committee: D02.03 - Elemental Analysis

Relations

• Replaces: ASTM D7212-06 - Standard Test Method for Low Sulfur in Automotive Fuels by Energy-Dispersive X-ray Fluorescence Spectrometry Using a Low-Background Proportional Counter
• Effective Date: 01-May-2007
• Replaced By: ASTM D7212-13 - Standard Test Method for Low Sulfur in Automotive Fuels by Energy-Dispersive X-ray Fluorescence Spectrometry Using a Low-Background Proportional Counter
• Effective Date: 15-Jun-2013
• Referred By: ASTM D7578-20 - Standard Guide for Calibration Requirements for Elemental Analysis of Petroleum Products and Lubricants
• Effective Date: 01-May-2007
• Referred By: ASTM D7455-19 - Standard Practice for Sample Preparation of Petroleum and Lubricant Products for Elemental Analysis
• Effective Date: 01-May-2007
• Referred By: ASTM D7343-20 - Standard Practice for Optimization, Sample Handling, Calibration, and Validation of X-ray Fluorescence Spectrometry Methods for Elemental Analysis of Petroleum Products and Lubricants
• Effective Date: 01-May-2007

Standards Content (Sample)

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: D7212 − 07
StandardTest 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* E29 Practice for Using Significant Digits in Test Data to
Determine Conformance with Specifications
1.1 This test method specifies an energy-dispersive X-ray
fluorescence (EDXRF) method for the determination of the
3. Terminology
total sulfur content of automotive fuels with a concentration
3.1 Definitions of Terms Specific to This Standard:
range from 7 mg/kg to 50 mg/kg.
3.1.1 low background proportional counter, n—an X-ray
1.1.1 The pooled limit of quantitation of this test method as
proportional counter that can suppress the noise generated
obtained by statistical analysis of interlaboratory test results is
when incident X rays are absorbed near the wall with resulting
7 mg/kg sulfur.
incomplete charge collection.
1.2 The values stated in SI units are to be regarded as the
3.1.1.1 Discussion—An electrode shield close to the wall
standard. The preferred concentration units are mg/kg sulfur.
detects incomplete charge collection and associated electronic
detection circuitry rejects those events. In comparison to
1.3 This standard does not purport to address all of the
conventional proportional counters, this gives lower spectral
safety concerns, if any, associated with its use. It is the
background and a lower limit of detection.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
4. Summary of Test Method
bility of regulatory limitations prior to use.
4.1 The sample is placed in the beam emitted from an X-ray
source with titanium target and primary filtration so that
2. Referenced Documents
excitation is by essentially monochromatic radiation of
2
2.1 ASTM Standards:
4.51 keV and virtually no background at 2.3 keV. A low
D4045 Test Method for Sulfur in Petroleum Products by
background proportional counter measures the intensity of the
Hydrogenolysis and Rateometric Colorimetry
fluorescent sulfur K series intensity and argon K series inten-
D4057 Practice for Manual Sampling of Petroleum and
sity (from residual air) and the accumulated counts are com-
Petroleum Products
pared with counts from previously prepared calibration stan-
D4177 Practice for Automatic Sampling of Petroleum and
dards to obtain the sulfur concentration in mg/kg. If chlorine is
Petroleum Products
expected to be present in some samples then other regions of
D6299 Practice for Applying Statistical Quality Assurance
the spectrum must be measured to provide compensation for
and Control Charting Techniques to Evaluate Analytical
spectral overlap. One group of calibration standards is required
Measurement System Performance
to span the concentration range from 0 to 150 mg/kg sulfur.
D6300 Practice for Determination of Precision and Bias
NOTE 1—Operation of analyzers using X-ray tubes is to be conducted
Data for Use in Test Methods for Petroleum Products and
in accordance with the manufacturer’s safety instructions and federal,
Lubricants state, and local regulations governing the use of ionizing radiation.
5. Significance and Use
5.1 This test method determines total sulfur in automotive
1
This test method is under the jurisdiction of ASTM Committee D02 on
fuels with a typical analysis time around 10 min per sample.
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee
D02.03 on Elemental Analysis.
5.2 The quality of automotive fuel is related to the amount
Current edition approved May 1, 2007. Published June 2007. Originally
of sulfur present. Knowledge of sulfur level is necessary for
approved in 2006. Last previous edition approved in 2006 as D7212–06. DOI:
processing purposes.
10.1520/D7212-07.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
5.3 Sulfur level in automotive fuels affects performance
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
characteristicsandairquality.Federal,state,andlocalagencies
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. regulate the level of sulfur in fuel delivered at the pump.
*A Summary of Changes section appears at the end of this standard
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