BS EN 14107 Fat and oil derivatives - Fatty Acid Methyl Esters (FAME) - Determination of phosphorous content by inductively coupled plasma (ICP) emission spectrometry
10 Results
Determine, according to the calibration curve, the phosphorus concentration c (mg/l) of the two test portions of a same sample.
Calculate the phosphorus concentration C of the sample, expressed in mg/kg, using the equation:
C = c x (V/m)
where
V is the volume of the sample solution (millilitres);
c is the phosphorus concentration of the sample solution (milligrams per litre);
m is the mass of the sample test portion (grams).
Calculate the phosphorus content C of the sample by taking the arithmetical mean of the two values obtained. Express the result in mg/kg to the nearest 0.1 mg/kg.
NOTE When the solutions are expressed in as mass fraction in percent (see Note in 5.6 and Note 2 in 9.2), the calculation of the phosphorus content C of the sample is made using the equation:
C = cp x (P/m)
where
cp is the concentration of the sample solution (milligrams per kilogram);
P is the total mass of the solution (grams).
11 Precision
11.1 Interlaboratory test
Details of an interlaboratory are given in annex A. The values derived from these tests may not be applicable to concentration ranges and matrices other than those given.
11.2 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: 0.6 mg/kg more than once out of 20 determinations.
11.3 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 = 0.192C + 0.025
more than once out of 20 determinations.
12 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.
