1.1 ,This test method covers the determination of copper in jet fuels in the range of 5 ,μ,g/kg to 100 ,μ,g/kg using graphite furnace atomic absorption spectrometry. Copper contents above 100 ,μ,g/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.