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Preparation and characterisation of synthetic mixtures of lithium isotopes
Qi, HP; Berglund, M; Taylor, PDP; Hendrickx, F; Verbruggen, A; De Bievre, P
AbstractRe-certification of the absolute isotopic com position of the natural lithium isotopic reference material (IRM), IRMM-016, requires measurements calibrated by means of synthetic mixtures of highly enriched lithium isotopes. Ten such mixtures were prepared by weighing and mixing of two well characterised, isotopically enriched, Li2CO3 compounds. The starting materials, 99.9981% enriched Li-6, and 99.9937% enriched Li-7, were purified by ion exchange, and the purified materials converted from LiOH to Li2CO3 by reaction with CO2. Ten new mixtures were prepared by mixing different weighed amounts of these dissolved Li2CO3 carrier compounds. The compounds had an estimated level of impurities of 100 +/- 100 mu g.g(-1) (expanded uncertainty with a coverage factor of 2). In the ten mixtures, the n(Li-6)/n(Li-7) ratio varies from 0.025 to 14 and the achieved expanded relative uncertainty on the amount ratio prepared is typically 2.10(-4). These mixtures were then used to determine the correction factor, K, for mass discrimination of the measurement procedure and instrument concerned.
WOS HeadingsScience & Technology ; Physical Sciences
Indexed BySCI
WOS Research AreaChemistry
WOS SubjectChemistry, Analytical
WOS IDWOS:000075919400004
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Document Type期刊论文
Affiliation1.Commiss European Communities, Joint Res Ctr, Inst Reference Mat & Measurements, B-2440 Geel, Belgium
2.Acad Sinica, Qinghai Inst Salt Lakes, Xining 810008, Peoples R China
Recommended Citation
GB/T 7714
Qi, HP,Berglund, M,Taylor, PDP,et al. Preparation and characterisation of synthetic mixtures of lithium isotopes[J]. FRESENIUS JOURNAL OF ANALYTICAL CHEMISTRY,1998,361(8):767-773.
APA Qi, HP,Berglund, M,Taylor, PDP,Hendrickx, F,Verbruggen, A,&De Bievre, P.(1998).Preparation and characterisation of synthetic mixtures of lithium isotopes.FRESENIUS JOURNAL OF ANALYTICAL CHEMISTRY,361(8),767-773.
MLA Qi, HP,et al."Preparation and characterisation of synthetic mixtures of lithium isotopes".FRESENIUS JOURNAL OF ANALYTICAL CHEMISTRY 361.8(1998):767-773.
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