BS ISO 771:2021 pdf download – Oilseed meals — Determination of moisture and volatile matter content.
3? Terms? and? definitions For the purposes of this document, the following terms and definitions apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: — ISO Online browsing platform: available at https://www.iso.org/obp — IEC Electropedia: available at http://www.electropedia.org/ 3.1 moisture and volatile matter content loss in weight measured under the operating conditions specified in this document Note 1 to entry: The moisture and volatile matter content is expressed as a mass fraction in grams per 100 g. 4 Principle The sample is ground to a particle size of 1 mm, followed by drying of a test portion at (103 ± 2) °C in an oven at atmospheric pressure, until practically constant mass is reached. 5 Apparatus 5.1 Analytical balance, readability 0,000 1 g, weighing precision 0,001 g. 5.2 Mechanical mill, easy to clean and allowing the meals to be ground, without heating and without appreciable change in the moisture, volatile matter and oil content, to particles passing completely through the sieve (5.3). 5.3 Sieve, with apertures of diameter 1 mm.
9 Precision 9.1 Results of interlaboratory test Details of an interlaboratory test on the precision of the method are summarized in Annex A. The values derived from this interlaboratory test might not be applicable to concentration ranges and matrices other than those given. 9.2 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 interval of time, will in not more than 5 % of cases be greater than r given as followed: — for mean value less than 4,0 % (in mass fraction): r = 0,2 %; — for mean value more than 4,0 % (in mass fraction): r = 0,018x + 0,13 (see Figure A.1). With x corresponding to the mean value of two reps. Some examples of r values are given in Annex B. 9.3 Reproducibility The absolute difference between two single test results, obtained using the same method on identical test material in different laboratories with different operators using different equipment, will in not more than 5 % of cases be greater than R given as followed: — for mean value less than 4,0 % (in mass fraction): R = 0,4 %; — for mean value more than 4,0 % (in mass fraction): R = 0,033x + 0,27 (see Figure A.1). With x corresponding to the mean value of two reps. Some examples of R values are given in Annex B. 10 Test report The test report shall specify: a) all information necessary for the complete identification of the sample; b) the test method used with reference to this document, i.e. ISO 771:2021;