1.1 This test method covers the determination of the trace
total nitrogen naturally found in liquid hydrocarbons boiling in
the range from approximately 50 to 400°C, with viscosities
between approximately 0.2 and 10 cSt (mm2/s) at room
temperature. This test method is applicable to naphthas, distillates,
and oils containing 0.3 to 100 mg/kg total nitrogen. For
liquid hydrocarbons containing more than 100 mg/kg total
nitrogen, Test Method D5762 can be more appropriate. This
test method has been successfully applied, during interlaboratory
studies, to sample types outside the range of the scope by
dilution of the sample in an appropriate solvent to bring the
total nitrogen concentration and viscosity to within the range
covered by the test method. However, it is the responsibility of
the analyst to verify the solubility of the sample in the solvent
and that direct introduction of the diluted sample by syringe
into the furnace does not cause low results due to pyrolysis of
the sample or solvent in the syringe needle.
1.2 The values stated in SI units are to be regarded as
standard. No other units of measurement are included in this
standard.