11 Expression of results
Report results obtained from Formula as "Carbon residue - micro method" to the nearest 0.01 % (m/m).
Or report carbon residue micro method on 10 % (V/V) residue to the nearest 0.01 % (m/m).
12 Precision
12.1 General
The precision given was derived from statistical analysis by ISO 4259 [5] of the results of interlaboratory testing of a matrix of fuels and were first published in 1983. The precision is shown graphically in Figure 3.
The precision data for 10 % volume residue come from statistical examination of the results of interlaboratory testing according to ISO 4259 of a matrix of fuels including automotive diesel fuels, gasoils, fuels containing up to 10 % (V/V) of fatty acid methyl esters (FAME), fuels with cetane improver and marine fuel, which was carried out by the Energy Institute in 2007.
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 normal and correct operation of the test method, exceed the values given in Formula, only in one case in 20:
where
X is the average of the results being compared, in % (m/m).
For carbon residue-micro method on 10 % volume distillation residue, using 4 ml vials, the repeatability is.
12.3 Reproducibility, R
The difference between two test results independently obtained by different operators operating in different laboratories on identical test material would, in the normal and correct operation of the test method, exceed the values given in Formula only in one case in 20:
where
X is the average of the results being compared, in % (m/m).
For carbon residue-micro method on 10 % volume distillation residue, using 4 ml vials, the reproducibility is:
13 Test report
The test report shall contain at least the following information:
a) type and complete identification of the product tested;
b) a reference to this International Standard (i.e. ISO 10370);
c) results of the test (see Clause 11);
d) any deviation, by agreement or otherwise, from the standard procedures specified;
e) date of the test.