IP 501 for Determination of Elements in residual Fuel Oil
IP 501 Determination of Aluminium, Silicon, Vanadium, Nickel, Iron, Sodium, Calcium, Zinc and Phosphorus in Residual Fuel Oil by Ashing, Fusion and Inductively Coupled Plasma Emission Spectrometry
9 Expression of results
Report the element content of each element of interest to the nearest 1 mg/kg.
10 Precision
10.1 General
The precision given in 10.2 and 10.3 for elements other than aluminium and silicon was determined by statistical examination by IP 367 of interlaboratory test results on a matrix of residual fuels that was also used for the precision evaluation of the same range of elements except phosphorus by atomic absorption spectrometry, and given in IP 470. The values for aluminium and silicon are taken from IP 377.
10.2 Repeatability
The difference between two 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 given in Table 2 only in one case in twenty.
10.3 Reproducibility
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 values given in Table 2 only in one case in twenty.
Examples of actual precision for this test method, calculated from Table 2, are detailed in Table 3 below as a guideline for the user.
Recordings at different wavelengths have been included in the precision study and listed in the below table as a guideline for the user.
11 Test report
The test report shall contain at least the following information:
a) a reference to this standard;
b) all details necessary for complete identification of the product tested;
c) the result of the test (see clause 9);
d) any deviations, by agreement or otherwise, from the procedures specified;
e) the date of the test.
