12. Report
12.1 Report the mass % hydrogen content on the test sample to the nearest 0.01 mass hydrogen.
13. Precision and Bias
13.1 The precision of this test method as obtained by statistical examination of interlaboratory test results is as follows:
13.1.1 Repeatability - The difference between successive test results obtained by the same operator with the same apparatus under constant operating conditions on identical test material would, in the long run, in the normal and correct operation of the test method, exceed the following value only in one case in twenty (see Table 1):
where X is the sample mean.
13.1.2 Reproducibility - The difference between two single and independent results obtained by different operators working in different laboratories on identical test material would, in the long run, in the normal and correct operation of the test method, exceed the following value in one case in twenty (see Table 1):
where X is the sample mean.
13.2 Bias:
13.2.1 A 1985 research report indicated that the hydrogen content determined by Test Methods A, B, and C are not biased with respect to data obtained by combustion techniques.
13.2.2 A 1977 research report indicated that the hydrogen content determined by Test Method A (same as Test Method D3701) is biased high with respect to the expected value for pure known hydrocarbons.
14. Keywords
14.1 distillate; gas oil; hydrogen content; light distillate; middle distillate; nuclear magnetic; petroleum products; residua; resonance spectroscopy