ISO 13759 Petroleum products - Determination of alkyl nitrate in diesel fuels - Spectrometric method
9 Expression of results
Report the concentration of alkyl nitrate by name, or, if the specific alkyl nitrate is not known, as calculated based on 2-ethylhexyl nitrate as a percentage volume fraction [%(V/V)], to the nearest 0.001 %.
10 Precision
The precision of the method, as obtained by statistical examination of interlaboratory test results, is as follows:
10.1 Repeatability, r
The difference between successive test results obtained by the same operator with the same apparatus under constant operating conditions on identical test material would, in the normal and correct operation of the test method, exceed the value of 0.017 % (V/V) (volume fraction of 0.017 %) only in one case in twenty.
10.2 Reproducibility, R
The difference between two single and independent results, obtained by different operators working in different laboratories on nominally identical test material would, in the normal and correct operation of the test method, exceed the value of 0.036 % (VW) (volume fraction of 0.036 %) only in one case in twenty.
11 Test report
The test report shall contain at least the following information:
a) a reference to this International Standard;
b) the type and complete identification of the product tested;
c) the result of the test (see clause 9);
d) any deviation, by agreement or otherwise, from the standard procedures specified;
e) the date of the test.
