- Method ASTM D1840
- Repeatability 0.0222(1.00+x)
- Reproducibility 0.0299(1.00+x)
- Blending linear
- Additive Correction No
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.
Naphthalenes have been found to produce more smoke, soot, and heat radiation when burned. This can cause excessive build up in turbine engines using the fuel which leads to a higher percentage of maintenance and failures.
The method is performed by measuring the light absorbance at 285nm of a diluted sample. This absorbance is then used to calculate a total percentage in the fuel.