caa a22 4500 465748856 CHVBK 20180323111828.0 cr unu---uuuuu 170327e19900101xx s 000 0 eng 10.1007/BF00322517 doi (NATIONALLICENCE)springer-10.1007/BF00322517 Characterization of a total diet reference material (ARC/CL HDP) for contents of essential and toxic elements [Elektronische Daten] [Jorma Kumpulainen, Raija Tahvonen] Summary: A total diet reference material (RM) was prepared by employing material leftover from a nationwide Finnish hospital diet study. The material was carefully homogenized using Ti-blades, freeze-dried, rehomogenized with Ti-blades, passed through a 2 mm nylon sieve and carefully mixed in large glass cylinders. Homogeneity of the material divided into 20 g samples in polyethylene bottles was tested by taking ten 0.5 g samples from the beginning and end of the bottling line and analyzing them for Zn and Mg. The homogeneity was within 1.0% for both Zn and Mg. An interlaboratory comparison study involving reliable reference laboratories that employed a total of seven methods based on independent analytical principles was conducted on the contents of 14 mineral elements. After the exclusion of outliers the recommended concentrations (on a dry weight basis) expressed as the medians±95% confidence limits were established as follows: Ca=2.86±0.124 mg/g, Mg=785±25 μg/g, K=9.42±0.30 mg/g, Na=7.87±0.57 mg/g, Fe=30.4±0.9 μg/g, Mn=12.9±0.58 μg/g, Zn=28.9±1.3 μg/g, Cu=3.18±0.19 μg/g, Mo=262±35 ng/g, Ni=271±38 ng/g, Se=181±17 ng/g, Pb=43±8 ng/g, Cd=21±3 ng/g and Hg=6.6±3.6 ng/g. All of the above recommended concentration ranges, except that for Ni, fell into category A, i.e. values recommended with a high degree of confidence according to the certification criteria established by Pszonicki. Springer-Verlag, 1990 Kumpulainen Jorma Institute of Food Research and Central Laboratory, Agricultural Research Centre of Finland, SF-31600, Jokioinen, Finland aut Tahvonen Raija Institute of Food Research and Central Laboratory, Agricultural Research Centre of Finland, SF-31600, Jokioinen, Finland aut Fresenius' Journal of Analytical Chemistry Springer-Verlag 338/4(1990-01-01), 461-465 0937-0633 338:4<461 1990 338 216 https://doi.org/10.1007/BF00322517 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00322517 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kumpulainen Jorma Institute of Food Research and Central Laboratory, Agricultural Research Centre of Finland, SF-31600, Jokioinen, Finland aut NATIONALLICENCE 700 1- Tahvonen Raija Institute of Food Research and Central Laboratory, Agricultural Research Centre of Finland, SF-31600, Jokioinen, Finland aut NATIONALLICENCE 773 0- Fresenius' Journal of Analytical Chemistry Springer-Verlag 338/4(1990-01-01), 461-465 0937-0633 338:4<461 1990 338 216 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer