ASTM D6732 Determination of Copper in Jet Fuels by Graphite Furnace Atomic Absorption Spectrometry
1. Scope
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 atomic absorption spectrometry. Copper contents above 100 µg/kg may be determined by sample dilution with kerosine to bring the copper level into the aforementioned method range. When sample dilution is used, the precision statements do not apply.

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.

2. Referenced Documents
2.1 ASTM Standards:
D4057 Practice for Manual Sampling of Petroleum and Petroleum Products
D4306 Practice for Aviation Fuel Sample Containers for Tests Affected by Trace Contamination
D6299 Practice for Applying Statistical Quality Assurance Techniques to Evaluate Analytical Measurement System Performance

3. Terminology
3.1 Definitions:
3.1.1 radiant power, P, n - the rate at which energy is transported in a beam of radiant energy.

3.1.2 transmittance, T, n - the ratio of the radiant power transmitted by a material to the radiant power incident upon it.

3.2 Definitions of Terms Specific to This Standard:
3.2.1 absorbance, A, n - the logarithm to the base 10 of the ratio of the reciprocal of the transmittance, T:
A = log10(1/T) = -log10T

3.2.2 integrated absorbance, Ai, n - the integrated area under the absorbance peak generated by the atomic absorption spectrometer.