ASTM D6732 Determination of Copper in Jet Fuels by Graphite Furnace Atomic Absorption Spectrometry
7.1 Atomic Absorption Spectrometer - An atomic absorption spectrometer with the capability of setting the wavelength at 324.8 nm, setting the slit width at typically 0.7 nm, and using peak area integration for the atomic and background readings shall be used. The spectrometer shall be equipped with the following:
7.1.1 Copper Hollow Cathode Lamp - as the elemental light source.
7.1.2 Background Correction Capability - to cover the 324.8 nm wavelength range.
7.1.3 Graphite Furnace Atomizer - which uses pyrolytically coated graphite tubes with L'vov platforms.
7.2 Autosampler or Manual Pipettor - capable of reproducibly delivering 10 +/- 0.5 µL aliquots of samples, standards, and blank to the graphite furnace.
7.3 Analytical Balance - capable of weighing 100 g +/- 0.0001 g.
8. Reagents and Materials
8.1 Purity of Reagents - Reagent grade chemicals shall be used in all tests. Unless otherwise indicated, it is intended that all reagents conform to the specifications of the Committee on Analytical Reagents of the American Chemical Society where such specifications are available.3 Other grades may be used, provided it is first ascertained that the reagent is of sufficiently high purity to permit its use without lessening the accuracy of the determination.
8.2 Odorless or Low Odor Kerosine, filtered through silica gel.
8.3 100 mg/kg Organo-metallic Standard for Copper, or a multielement standard containing copper at 100 mg/kg.
8.4 Silica Gel, 100 to 200 mesh.
8.5 Argon Gas, 99.999%, (Warning - Argon is a compressed gas under high pressure) for graphite furnace gas flow system.
8.6 Quality Control (QC) Samples, preferably are portions of one or more kerosine materials that are stable and representative of the samples of interest. These QC samples can be used to check the validity of the testing process as described in Section 14. Use a stable QC concentrate, and dilute it on the day of the QC check to the trace level required.
9.1 Samples shall be taken in accordance with procedures described in Practice D4057.
9.2 Samples shall be thoroughly mixed in their containers immediately prior to testing.