caa a22 4500 46574902X CHVBK 20180323111828.0 cr unu---uuuuu 170327e19900101xx s 000 0 eng 10.1007/BF00322541 doi (NATIONALLICENCE)springer-10.1007/BF00322541 Characterization of the mineral fraction in botanical reference materials and its influence on homogeneity and analytical results [Elektronische Daten] [R. Lindstrom, A. Byrne, D. Becker, B. Smodiš, K. Garrity] Summary: The NIST natural-product leaf Standard Reference Materials have been widely used in developing reliable methods of analysis. A small amount of mineral matter present in these materials was separated by flotation, and characterized qualitatively by microscopy and quantiatively by neutron activation analysis. Several elements are concentrated in the mineral fraction, which can lead to analytical error through incomplete dissolution or sampling statistics. Two new candidate materials prepared by the Office of Standard Reference Materials, SRM 1515 Apple Leaves and SRM 1547 Peach Leaves, have been processed with an air-jet mill, resulting in a very finely ground leaf material, with particle size less than 200 mesh. A cyclone classifier in the process discriminates against coarse grit, so that the content of minerals in the ground material is less than in the first-generation materials. Better homogeneity was in fact observed, even down to 100 mg sample size. One must use caution, however, to assure that any inhomogeneity found in real samples are appropriately considered and dealt with. Springer-Verlag, 1990 Lindstrom R. Center for Analytical Chemistry, National Institute of Standards and Technology, 20899, Gaithersburg, MD, USA aut Byrne A. Institute "Jožef Stefan”, YU-61111, Ljubljana, Yugoslavia aut Becker D. Center for Analytical Chemistry, National Institute of Standards and Technology, 20899, Gaithersburg, MD, USA aut Smodiš B. Institute "Jožef Stefan”, YU-61111, Ljubljana, Yugoslavia aut Garrity K. Center for Analytical Chemistry, National Institute of Standards and Technology, 20899, Gaithersburg, MD, USA aut Fresenius' Journal of Analytical Chemistry Springer-Verlag 338/4(1990-01-01), 569-571 0937-0633 338:4<569 1990 338 216 https://doi.org/10.1007/BF00322541 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00322541 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Lindstrom R. Center for Analytical Chemistry, National Institute of Standards and Technology, 20899, Gaithersburg, MD, USA aut NATIONALLICENCE 700 1- Byrne A. Institute "Jožef Stefan”, YU-61111, Ljubljana, Yugoslavia aut NATIONALLICENCE 700 1- Becker D. Center for Analytical Chemistry, National Institute of Standards and Technology, 20899, Gaithersburg, MD, USA aut NATIONALLICENCE 700 1- Smodiš B. Institute "Jožef Stefan”, YU-61111, Ljubljana, Yugoslavia aut NATIONALLICENCE 700 1- Garrity K. Center for Analytical Chemistry, National Institute of Standards and Technology, 20899, Gaithersburg, MD, USA aut NATIONALLICENCE 773 0- Fresenius' Journal of Analytical Chemistry Springer-Verlag 338/4(1990-01-01), 569-571 0937-0633 338:4<569 1990 338 216 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer