ASTM D4530 test method for determination of carbon residue (Micro method)
11. Report
11.1 Report the value obtained as Micro Method carbon residue, percent or as Micro Method carbon residue on 10 % distillation residue, percent to the nearest 0.1 % (m/m).
12. Precision and Bias
12.1 The precision of this test method as determined by (see Note 5) statistical examination of interlaboratory results is as follows:
NOTE 5 - Precision data and Conradson carbon residue/micro carbon residue correlation data were generated by a task force in 1983. The round robin involved 18 laboratories, six petroleum materials in duplicate analysis for both micro method and Test Method D189 tests. The range of values for samples was from 0.3 % to 26 % (m/m). No precision data or correlation data exists for results obtained using 10 % bottoms or 15-mL vials, or both.
12.2 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. 3 in only one case in twenty.
12.3 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. 3 in only one case in twenty.
12.4 Bias - The procedure in Test Method D4530 for measuring carbon residue of petroleum by the carbon residue method has no bias because the mass % of carbon residue can be defined only in terms of the test method.
13. Keywords
13.1 carbon residue; carbon residue (micro method); diesel fuel; lubricating oil; petroleum products
