ASTM D524 method for Ramsbottom carbon residue of petroleum products
11. Calculation and Report
11.1 Calculate the carbon residue of the sample or of the 10 % distillation residue as follows:
Carbon residue = (A x 100)/W
where:
A = mass of carbon residue, g, and
W = mass of sample, g.
11.2 Report the value obtained as Ramsbottom carbon residue, percent or as Ramsbottom carbon residue on 10 % distillation residue, percent.
12. Precision and Bias
12.1 The precision of this test method as determined by statistical examination of interlaboratory results is as follows:
12.1.1 Repeatability - The difference between two 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 values shown in Fig. 4 only in one case in twenty.
12.1.2 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 values shown in Fig. 4 only in one case in twenty.
NOTE 15 - Precision is based on data developed using inch-pound units. See Test Method D524.
12.2 Bias - This test method is empirical and no statement of bias can be made.
13. Keywords
13.1 carbon residue; petroleum products; Ramsbottom
