caa a22 4500 605465444 CHVBK 20210128100302.0 cr unu---uuuuu 210128e20150201xx s 000 0 eng 10.1007/s00769-014-1096-x doi (NATIONALLICENCE)springer-10.1007/s00769-014-1096-x Uncertainty from sample preparation in the laboratory on the example of various feeds [Elektronische Daten] [Waldemar Korol, Grażyna Bielecka, Jolanta Rubaj, Sławomir Walczyński] A way of uncertainty calculation from test sample preparation in the laboratory was presented on the example of feeds. The essence of the proposal lies in separating two components of results' variability expressed as coefficient of variation CV p: analytical variability CV a (repeatability) and technical variability CV h corresponding with the inhomogeneity of a component. The law of Gauss's error propagation was used. Analytical variability CV a was calculated from the range of duplicate analyses, following Nordtest Handbook. It was assumed that the coefficient of technical variability CV h is the measure of the standard uncertainty from sample preparation in the uncertainty budget of a method u s+h, and expanded uncertainty U s+h for k=2 (P=95%) can be easily calculated as U s+h= 2 u s+h. Calculated uncertainties with uncertainties from sample preparation for loose feed and no ground premixture have increased from 4 to 125% and were higher than analytical uncertainties calculated acc. to GUM during validation of methods. In the case of granulated feed mixture, the obtained uncertainties were similar. Grinding the premix results in lower uncertainties. Uncertainty from sample preparation should be taken into account in the uncertainty budget of a test method, especially in the case of inhomogeneity of tested materials. The Author(s), 2015 Sample preparation nationallicence Analytical variability nationallicence Technical variability nationallicence Uncertainty nationallicence Feedingstuffs nationallicence Korol Waldemar National Research Institute of Animal Production, National Laboratory for Feedingstuffs, St. Chmielna 2, 20-079, Lublin, Poland aut Bielecka Grażyna National Research Institute of Animal Production, National Laboratory for Feedingstuffs, St. Chmielna 2, 20-079, Lublin, Poland aut Rubaj Jolanta National Research Institute of Animal Production, National Laboratory for Feedingstuffs, St. Chmielna 2, 20-079, Lublin, Poland aut Walczyński Sławomir National Research Institute of Animal Production, National Laboratory for Feedingstuffs, St. Chmielna 2, 20-079, Lublin, Poland aut Accreditation and Quality Assurance Springer Berlin Heidelberg 20/1(2015-02-01), 61-66 0949-1775 20:1<61 2015 20 769 https://doi.org/10.1007/s00769-014-1096-x text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00769-014-1096-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Korol Waldemar National Research Institute of Animal Production, National Laboratory for Feedingstuffs, St. Chmielna 2, 20-079, Lublin, Poland aut NATIONALLICENCE 700 1- Bielecka Grażyna National Research Institute of Animal Production, National Laboratory for Feedingstuffs, St. Chmielna 2, 20-079, Lublin, Poland aut NATIONALLICENCE 700 1- Rubaj Jolanta National Research Institute of Animal Production, National Laboratory for Feedingstuffs, St. Chmielna 2, 20-079, Lublin, Poland aut NATIONALLICENCE 700 1- Walczyński Sławomir National Research Institute of Animal Production, National Laboratory for Feedingstuffs, St. Chmielna 2, 20-079, Lublin, Poland aut NATIONALLICENCE 773 0- Accreditation and Quality Assurance Springer Berlin Heidelberg 20/1(2015-02-01), 61-66 0949-1775 20:1<61 2015 20 769