Improving iodine homogeneity in NIST SRM 1548a Typical Diet by cryogenic grinding

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F15%3A00445105" target="_blank" >RIV/61389005:_____/15:00445105 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1007/s00769-015-1134-3" target="_blank" >http://dx.doi.org/10.1007/s00769-015-1134-3</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s00769-015-1134-3" target="_blank" >10.1007/s00769-015-1134-3</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Improving iodine homogeneity in NIST SRM 1548a Typical Diet by cryogenic grinding

Popis výsledku v původním jazyce

NIST SRM 1548a Typical Diet has a certified iodine mass fraction value of 0.759 mg kg(-1), with a rather large expanded uncertainty (relative value 13.6 %). This might be due to the iodine inhomogeneous distribution in the pooled food material. We have proven that cryogenic grinding of NIST SRM 1548a (at the temperature of liquid nitrogen) yields a free-flowing material, with the standard deviation due to a random inhomogeneity that is lower (by a factor of 3) compared with the original material. We have also proven that no change in the certified iodine value and no contamination with other elements present (even at the sub-A mu g kg(-1) level) occurred during the cryogenic grinding process. Thus, we have obtained a quality control material that setsup more stringent requirements on the validation and quality control procedures of the measurement of iodine mass fraction in complex food matrices.

Název v anglickém jazyce

Improving iodine homogeneity in NIST SRM 1548a Typical Diet by cryogenic grinding

Popis výsledku anglicky

NIST SRM 1548a Typical Diet has a certified iodine mass fraction value of 0.759 mg kg(-1), with a rather large expanded uncertainty (relative value 13.6 %). This might be due to the iodine inhomogeneous distribution in the pooled food material. We have proven that cryogenic grinding of NIST SRM 1548a (at the temperature of liquid nitrogen) yields a free-flowing material, with the standard deviation due to a random inhomogeneity that is lower (by a factor of 3) compared with the original material. We have also proven that no change in the certified iodine value and no contamination with other elements present (even at the sub-A mu g kg(-1) level) occurred during the cryogenic grinding process. Thus, we have obtained a quality control material that setsup more stringent requirements on the validation and quality control procedures of the measurement of iodine mass fraction in complex food matrices.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

CB - Analytická chemie, separace

OECD FORD obor

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Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2015

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Accreditation and Quality Assurance

ISSN

0949-1775

e-ISSN

—

Svazek periodika

20

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

6

Strana od-do

189-194

Kód UT WoS článku

000355207700004

EID výsledku v databázi Scopus

2-s2.0-84929943475