These test methods are a precise and simple alternative to other methods such as combustion or empirical methods for hydrogen determination in fuels. They use a continuous wave, low-resolution nuclear magnetic resonance spectrometer. Three test methods are included here to take into account special characteristics of different petroleum products: light distillates, middle distillates and gas oils, and residua.
TEST SUMMARY
A sample of the fuel is compared in a continuous wave, low-resolution, nuclear magnetic resonance spectrometer with a reference standard sample of pure hydrocarbon. The method is specifically based on Newport analyzers.
TEST PRECISION
Where X is the sample mean.
A 1985 research report indicated that these test methods are not biased with respect to data obtained by the combustion techniques. A 1977 research report, however, indicates that Test Method A (same as Test Method D3701) is biased high with respect to the expected value of pure known compounds.