ISO 20884 Petroleum products - Determination of sulfur content of automotive fuels - Wavelength-dispersive X-ray fluorescence spectrometry
11 Expression of results
Report the sulfur content of the sample to the nearest 0.1 mg/kg between 5 mg/kg and 99 mg/kg, and to the nearest 1 mg/kg between 100 mg/kg and 500 mg/kg.
12 Precision
12.1 General
The precision, as determined by statistical examination in accordance with ISO 4259, is given in 12.2 and 12.3. The precision for monochromatic excitation instruments (5.1) is valid only for sulfur contents from 5 mg/kg to 60 mg/kg.
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 4 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 test material would, in the long run, in the normal and correct operation of the test method, exceed the values given in Table 4 in only one case in 20.
13 Test report
The test report shall contain at least the following information:
a) a reference to this International Standard (i.e. ISO 20884:2011);
b) the type and complete identification of the product tested;
c) the result of the test (see Clause 11);
d) any deviation, by agreement or otherwise, from the procedure specified;
e) the date of the test.
