BS EN 14109 Fat and oil derivatives - Fatty Acid Methyl Esters (FAME) - Determination of potassium content by atomic absorption spectrometry
6 Expression of results
Determine the potassium contents c1 and c2 in mg/l of the two test portions of the sample, by referring to the calibration curve.
Calculate the potassium contents C1 and C2 of the sample, expressed in mg/kg, using the equation:
C = c x (V/m)
where
m is the mass (in grams) of the sample test portion;
V is the volume of the sample solution (in millilitres).
Calculate the mean content C of potassium in the sample from C1 and C2.
Express the result in mg/kg, to the nearest 0.1 mg/kg.
7 Precision
An interlaboratory test organized in 2000 at European level with the participation of 13 laboratories, each having carried out two determinations on each sample, gave the statistical results indicated in annex A.
7.1 Repeatability
The absolute difference between two independent single test results, obtained using the same method on identical test material in the same laboratory by the same operator using the same equipment within a short time interval, shall not be greater than r = 0.3 mg/kg more than once out of 20 determinations.
7.2 Reproducibility
The absolute difference between two single test results, obtained using the same method on identical test material in different laboratories by different operators using different equipment, shall not be greater than:
R = 0.505X + 0.522
more than once out of 20 determinations.
8 Test report
The test report shall specify:
- all information necessary for the complete identification of the sample;
- the sampling method used if known;
- the test method used, with reference to this European standard;
- all operating details not specified in this European Standard, or regarded as optional, together with details of any incidents which may have influenced the test result(s);
- the test result(s) obtained, or if the repeatability has been checked, the final quoted result obtained.
