BS EN 14106 Fat and oil derivatives - Fatty Acid Methyl Esters (FAME) - Determination of free glycerol content
10 Results
Calculate, by means of integrator, the areas of peaks belonging to the unknown sample. The percent content of free glycerol in sample is given by the following formula:
Free glycerol, %(m/m) = [(A2/A1) x Fr x m1]/m x 100
where
A1, A2, Fr have the same meaning as in formula;
m1 is the mass of internal standard in sample (milligrams);
m is the mass of sample (milligrams).

The result shall be expressed as a mass fraction in percent, rounded to two digits.

11 Precision
11.1 Interlaboratory test
Details of interlaboratory test 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 difference between two results obtained by the same operator, with the same apparatus under constant operating conditions on the same sample, will be higher than the repeatability limit (r) as calculated from the formulae in following table, only in one case in twenty.

11.3 Reproducibility
The absolute difference between two independent single test results, obtained by two different operators working in different laboratories using the same method on identical test material within a short interval of time will be higher than the reproducibility limit (R) as calculated from the formulae in following table, only in 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.