1.1 ,This test method covers the determination, by ultraviolet spectrophotometry, of the total concentration of naphthalene, acenaphthene, and alkylated derivatives of these hydrocarbons in jet fuels. This test method is designed to analyze fuels containing not more than 5 ,% of such components and having end points below 315 ,°,C (600 ,°,F), however, the range of concentrations used in the interlaboratory test programs which established the precision statements for this test method were 0.03 ,% to 4.25 ,% by volume for Procedure A, and 0.08 ,% to 5.6 ,% by volume for Procedure B. This test method determines the maximum amount of naphthalenes that could be present.