Standard Test Method for (Thiol Mercaptan) Sulfur in Gasoline, Kerosine, Aviation Turbine, and Distillate Fuels (Potentiometric Method)

SCOPE
1.1 This test method covers the determination of mercaptan sulfur in gasolines, kerosines, aviation turbine fuels, and distillate fuels containing from 0.0003 to 0.01 mass% of mercaptan sulfur. Organic sulfur compounds such as sulfides, disulfides, and thiophene do not interfere. Elemental sulfur in amounts less than 0.0005 mass % does not interfere. Hydrogen sulfide will interfere, if not removed as described in 9.2.  
1.2 The values in acceptable SI units are to be regarded as the standard. The values in parentheses are for information 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. For specific hazard statements, see Sections 6, 8, and 9.

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Historical
Publication Date
09-Nov-2002
Current Stage
Ref Project

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Effective Date
10-Nov-2002

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ASTM D3227-02a - Standard Test Method for (Thiol Mercaptan) Sulfur in Gasoline, Kerosine, Aviation Turbine, and Distillate Fuels (Potentiometric Method)
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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
An American National Standard
Designation: D 3227 – 02a
Designation: 342/00
Standard Test Method for
(Thiol Mercaptan) Sulfur in Gasoline, Kerosene, Aviation
1
Turbine, and Distillate Fuels (Potentiometric Method)
This standard is issued under the fixed designation D 3227; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope * D 6299 Practice for Applying Statistical Quality Assurance
Techniques to Evaluate Analytical Measurement System
1.1 This test method covers the determination of mercaptan
5
Performance
sulfur in gasolines, kerosenes, aviation turbine fuels, and
distillate fuels containing from 0.0003 to 0.01 mass % of
3. Summary of Test Method
mercaptan sulfur. Organic sulfur compounds such as sulfides,
3.1 The hydrogen sulfide-free sample is dissolved in an
disulfides, and thiophene, do not interfere. Elemental sulfur in
alcoholic sodium acetate titration solvent and titrated potentio-
amounts less than 0.0005 mass % does not interfere. Hydrogen
metrically with silver nitrate solution, using as an indicator the
sulfide will interfere if not removed, as described in 9.2.
potential between a glass reference electrode and a silver/
1.2 The values in acceptable SI units are to be regarded as
silver-sulfide indicating electrode. Under these conditions, the
the standard. The values in parentheses are for information
mercaptan sulfur is precipitated as silver mercaptide and the
only.
end point of the titration is shown by a large change in cell
1.3 This standard does not purport to address all of the
potential.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
4. Significance and Use
priate safety and health practices and determine the applica-
4.1 Mercaptan sulfur has an objectionable odor, an adverse
bility of regulatory limitations prior to use. For specific hazard
effect on fuel system elastomers, and is corrosive to fuel
statements, see Sections 6, 8, and 9.
system components.
2. Referenced Documents
5. Apparatus
2.1 ASTM Standards:
2 5.1 As described in 5.2-5.5; alternatively, any automatic
D 1193 Specification for Reagent Water
titration system may be used that, using the same electrode pair
3
D 1250 Guide for Petroleum Measurement Tables
described in 5.3, is capable of performing the titration as
D 1298 Test Method for Density, Relative Density (Specific
described in Section 9 and selecting the endpoint specified in
Gravity), or API Gravity of Crude Petroleum and Liquid
3 11.1 with a precision that meets or is better than that given in
Petroleum Products by Hydrometer Method
Section 13.
D 4052 Test Method for Density and Relative Density of
4 5.2 Meter—An electronic voltmeter, operating on an input
Liquids by Digital Density Meter
−12
of less than 9 3 10 A and having a sensitivity of 62mV
D 4057 Practice for Manual Sampling of Petroleum and
4 over a range of at least 61 V. The meter shall be electrostati-
Petroleum Products
6
cally shielded, and the shield shall be connected to the ground.
D 4177 Practice for Automatic Sampling of Petroleum and
4 5.3 Cell System, consisting of a reference and indicating
Petroleum Products
electrode. The reference electrode should be a sturdy, pencil-
type glass electrode, having a shielded lead connected to
ground. The indicating electrode shall be made from a silver
1
This test method is under the jurisdiction of ASTM Committee D02 on
wire, 2 mm (0.08 in.) in diameter or larger, mounted in an
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee
insulated support. Silver billet electrodes can also be used.
D02.03 on Elemental Analysis.
Current edition approved Nov. 10, 2002. Published February 2003. Originally
approved in 1973. Last previous edition approved in 2002 as D 3227–02.
2
Annual Book of ASTM Standards, Vol 11.01.
3 5
Annual Book of ASTM Standards, Vol 05.01. Annual Book of ASTM Standards, Vol 05.03.
4 6
Annual Book of ASTM Standards, Vol 05.02. Any apparatus that will give equal or better precision will be acceptable.
*A Summary of Changes section appears at the end of this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D 3227 – 02a
5.4 Buret, 10-mL capacity, graduated in 0.05-mL intervals, 6.6.1 Standardization—Add six drops of concentrated
with a tip that extends approximately 120 mm (5 in.) below the HNO (relative density 1.42) (W
...

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