ASTM D6732-02
(Test Method)Standard Test Method for Determination of Copper in Jet Fuels by Graphite Furnace Atomic Absorption Spectrometry
Standard Test Method for Determination of Copper in Jet Fuels by Graphite Furnace Atomic Absorption Spectrometry
SCOPE
1.1 This test method covers the determination of copper in jet fuels in the range of 5 to 100μ g/kg using graphite furnace atomic absorption spectrometry. Copper contents above 100 μg/kg may be determined by sample dilution with kerosene to bring the copper level into the aforementioned method range. When sample dilution is used, the precision statements do not apply.
Note 1—This test method is not intended for use in specifications.
1.2 The values stated in SI units are to be regarded as standard.
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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An American National Standard
Designation: D 6732 – 02
Standard Test Method for
Determination of Copper in Jet Fuels by Graphite Furnace
1
Atomic Absorption Spectrometry
This standard is issued under the fixed designation D 6732; 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* 3.2.1 absorbance, A, n—the logarithm to the base 10 of the
ratio of the reciprocal of the transmittance, T:
1.1 This test method covers the determination of copper in
jet fuels in the range of 5 to 100 µg/kg using graphite furnace A 5 log ~1/T! 5 –log T (1)
10 10
atomic absorption spectrometry. Copper contents above 100
3.2.2 integrated absorbance, A, n—the integrated area
i
µg/kg may be determined by sample dilution with kerosene to
under the absorbance peak generated by the atomic absorption
bring the copper level into the aforementioned method range.
spectrometer.
When sample dilution is used, the precision statements do not
apply.
4. Summary of Test Method
4.1 The graphite furnace is aligned in the light path of the
NOTE 1—This test method is not intended for use in specifications.
atomic absorption spectrometer equipped with background
1.2 The values stated in SI units are to be regarded as
correction. An aliquot (typically 10 µL) of the sample is
standard.
pipetted onto a platform in the furnace. The furnace is heated
1.3 This standard does not purport to address all of the
to low temperature to dry the sample completely without
safety concerns, if any, associated with its use. It is the
spattering. The furnace is then heated to a moderate tempera-
responsibility of the user of this standard to establish appro-
ture to eliminate excess sample matrix. The furnace is further
priate safety and health practices and determine the applica-
heated very rapidly to a temperature high enough to volatilize
bility of regulatory limitations prior to use.
the analyte of interest. It is during this step that the amount of
light absorbed by the copper atoms is measured by the
2. Referenced Documents
spectrometer.
2.1 ASTM Standards:
4.2 The light absorbed is measured over a specified period.
D 4057 Practice for Manual Sampling of Petroleum and
The integrated absorbance A produced by the copper in the
2
i
Petroleum Products
samples is compared to a calibration curve constructed from
D 4306 Practice for Aviation Fuel Sample Containers for
measured A values for organo-metallic standards.
2
i
Tests Affected by Trace Contamination
D 6299 Practice for Applying Statistical Quality Assurance
5. Significance and Use
Techniques to Evaluate Analytical Measurement System
5.1 At high temperatures aviation turbine fuels can oxidize
3
Performance
and produce insoluble deposits that are detrimental to aircraft
propulsion systems. Very low copper concentrations (in excess
3. Terminology
of 50 µg/kg) can significantly accelerate this thermal instability
3.1 Definitions:
of aviation turbine fuel. Naval shipboard aviation fuel delivery
3.1.1 radiant power, P, n—the rate at which energy is
systems contain copper-nickel piping, which can increase
transported in a beam of radiant energy.
copper levels in the fuel. This test method may be used for
3.1.2 transmittance, T, n—the ratio of the radiant power
quality checks of copper levels in aviation fuel samples taken
transmitted by a material to the radiant power incident upon it.
on shipboard, in refineries, and at fuel storage depots.
3.2 Definitions of Terms Specific to This Standard:
6. Interferences
1
6.1 Interferences most commonly occur due to light that is
This test method is under the jurisdiction of ASTM Committee D02 on
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee
absorbed by species other than the atomic species of interest.
D02.03 on Elemental Analysis.
Generally, this is due to undissociated molecular particles from
Current edition approved Nov. 10, 2002. Published November 2002. Originally
thesamplematrix.Thecharstepinthefurnaceprogramisused
published as D 6732–01. Last previous edition D 6732–01.
2
to eliminate as much of the matrix as possible before the
Annual Book of ASTM Standards, Vol 05.02.
3
Annual Book of ASTM Standards, Vol 05.04.
*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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D6732–02
atomization step. Spectrometers are equipped with background 10. Calibration and Standardization
correction capabilities to control further possibilities of erro-
10.1 Pre
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