Počet záznamů: 1
Vliv kryogenního mletí na homogenitu jódu v NIST SRM1548a Typical Diet
- 1.
SYSNO ASEP 0466547 Druh ASEP K - Konferenční příspěvek (lokální konf.) Zařazení RIV Stať ve sborníku Název Vliv kryogenního mletí na homogenitu jódu v NIST SRM1548a Typical Diet Překlad názvu Impact of cryogenic grinding on iodine homogeneity in NIST SRM 1548a Typical Diet Tvůrce(i) Kameník, Jan (UJF-V) RID, ORCID, SAI
Kučera, Jan (UJF-V) RID, ORCID, SAICelkový počet autorů 2 Zdroj.dok. Sborník přednášek z 6. ročníku konference Analytické standardy a vybavení. - Český Těšín : 2THETA, 2016 - ISBN 978-80-86380-82-7
S. 23-28Poč.str. 6 s. Forma vydání Tištěná - P Akce Referenční materiály a mezilaboratorní porovnávání zkoušek VI Datum konání 11.11.2016 - 11.11.2016 Místo konání Valtice Země CZ - Česká republika Typ akce EUR Jazyk dok. cze - čeština Země vyd. CZ - Česká republika Klíč. slova SRM1548a Typical Diet ; epithermal neutron activation analysis ; radiochemical neutron activation analysis Vědní obor RIV CB - Analytická chemie, separace CEP GBP108/12/G108 GA ČR - Grantová agentura ČR LM2011019 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy Institucionální podpora UJF-V - RVO:61389005 Anotace The reference material NIST SRM 1548a Typical Diet has a certified iodine mass fraction of 0.759±0.103 mg kg-1. The expanded uncertainty is rather large (relative value 13.6 %), thus the material does not provide strict requirements for quality control results. Milling of NIST SRM 1548a at the temperature of liquid nitrogen yielded free-flowing material. Iodine mass fraction in the original and cryo-ground materials was determined by epithermal neutron activation analysis (ENAA) and radiochemical neutron activation analysis (RNAA). The average and standard deviation from both methods was 0.73±0.03 mg kg-1 (20 values). The determined mass fraction was in a close agreement with the certified value of NIST SRM 1548a, thus iodine total content was not influenced by the milling procedure. In comparison to iodine mass fraction determined in the original NIST SRM 1548a 0.72±0.07 mg kg-1 (average ± standard deviation, 14 values), the standard deviation for cryo-ground material was considerably lower. The prepared quality control material sets up more stringent requirements on the validation and quality control procedures of the measurement of iodine mass fraction in such a composite food matrices. We believe that the iodine random inhomogeneity in the original NIST SRM 1548a is due to insufficient mixing of some iodine-rich component in the complex food matrices. Milling at the temperature of liquid nitrogen offers an effective option for production of future reference materials of this kind. Překlad anotace The reference material NIST SRM 1548a Typical Diet has a certified iodine mass fraction of 0.759±0.103 mg kg-1. The expanded uncertainty is rather large (relative value 13.6 %), thus the material does not provide strict requirements for quality control results. Milling of NIST SRM 1548a at the temperature of liquid nitrogen yielded free-flowing material. Iodine mass fraction in the original and cryo-ground materials was determined by epithermal neutron activation analysis (ENAA) and radiochemical neutron activation analysis (RNAA). The average and standard deviation from both methods was 0.73±0.03 mg kg-1 (20 values). The determined mass fraction was in a close agreement with the certified value of NIST SRM 1548a, thus iodine total content was not influenced by the milling procedure. In comparison to iodine mass fraction determined in the original NIST SRM 1548a 0.72±0.07 mg kg-1 (average ± standard deviation, 14 values), the standard deviation for cryo-ground material was considerably lower. The prepared quality control material sets up more stringent requirements on the validation and quality control procedures of the measurement of iodine mass fraction in such a composite food matrices. We believe that the iodine random inhomogeneity in the original NIST SRM 1548a is due to insufficient mixing of some iodine-rich component in the complex food matrices. Milling at the temperature of liquid nitrogen offers an effective option for production of future reference materials of this kind. Pracoviště Ústav jaderné fyziky Kontakt Markéta Sommerová, sommerova@ujf.cas.cz, Tel.: 266 173 228 Rok sběru 2017
Počet záznamů: 1