ISO 3924 Petroleum products - Determination of boiling range distribution - Gas chromatography method
12 Expression of results
12.1 Report the temperature to the nearest 0.5 °C at 1 % intervals between 1 % and 99 % and at the IBP and the FBP.
12.2 If a plot of the boiling-point distribution curve is required, use graph paper with uniform subdivisions and plot each boiling temperature against its corresponding percentage recovered. Plot the initial boiling point at 0 % and the final boiling point at 100 % recovered. Draw a smooth curve connecting the points.
13 Precision
13.1 General
The precision, as determined by statistical examination in accordance with ISO 4259 of interlaboratory test results, is given in 13.2 and 13.3.
13.2 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 given in Table 7 in only one case in 20.
13.3 Reproducibility
The difference between two single and independent test 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 given in Table 8 in only one case in 20.
14 Test report
The test report shall contain at least the following information:
a) reference to this International Standard;
b) type and complete identification of the product tested;
c) result of the test (see Clause 12);
d) any deviation, by agreement or otherwise, from the procedure specified;
e) date of the test.
