Preparation and characterisation of synthetic mixtures of lithiumisotopes

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	Preparation and characterisation of synthetic mixtures of lithiumisotopes
	Qi, HP; Berglund, M; Taylor, PDPHendrickx, FVerbruggen, ADe Bievre, P
	1998
发表期刊	FRESENIUS JOURNAL OF ANALYTICAL CHEMISTRY
ISSN	0937-0633
卷号	361 期号:8 页码:767-773
摘要	Re-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. Re-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.
文献类型	期刊论文
条目标识符	http://ir.isl.ac.cn/handle/363002/2379
专题	青海盐湖研究所知识仓储中国科学院青海盐湖研究所
推荐引用方式 GB/T 7714	Qi, HP,Berglund, M,Taylor, PDPHendrickx, FVerbruggen, ADe Bievre, P. Preparation and characterisation of synthetic mixtures of lithiumisotopes[J]. FRESENIUS JOURNAL OF ANALYTICAL CHEMISTRY,1998,361(8):767-773.
APA	Qi, HP,Berglund, M,&Taylor, PDPHendrickx, FVerbruggen, ADe Bievre, P.(1998).Preparation and characterisation of synthetic mixtures of lithiumisotopes.FRESENIUS JOURNAL OF ANALYTICAL CHEMISTRY,361(8),767-773.
MLA	Qi, HP,et al."Preparation and characterisation of synthetic mixtures of lithiumisotopes".FRESENIUS JOURNAL OF ANALYTICAL CHEMISTRY 361.8(1998):767-773.