ISO 20846 Petroleum products - Determination of sulfur content of automotive fuels - Ultraviolet fuorescence method
11 Expression of results
Report the sulfur content of the sample, in milligrams per kilogram (mg/kg), to the nearest 1 mg/kg above 60 mg/kg and to the nearest 0.1 mg/kg below 60 mg/kg.
The precision, as determined by statistical examination in accordance with ISO 4259, is given in 12.2 and 12.3.
12.2 Repeatability, r
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 2 in only one case in 20.
12.3 Reproducibility, R
The difference between two single and independent test results obtained by different operators working in different laboratories on identical material would, in the long run, in the normal and correct operation of the test method, exceed the values given in Table 3 in only one case in 20.
Examples of the above precision estimates are given in Table 4.
13 Test report
The test report shall contain at least the following information:
a) a reference to this International Standard (ISO 20846:2011);
b) the type and complete identifcation of the product tested;
c) the result of the test (see Clause 11);
d) any deviation, by agreement or otherwise, from the procedure specifed;
e) the date of the test.