Isotopic analysis of lithium salts by 6Li nuclear magnetic resonance and Knudsen effusion high temperature mass spectrometry

Autor:	P.P Semjannikov, S.V Tkachev, V.N Mitkin, Yu.A Fedorov, V.L Passetchnik, A.B Alexandrov
Rok vydání:	2003
Předmět:	Detection limit Analytical chemistry chemistry.chemical_element Resonance Mass spectrometry Atomic and Molecular Physics and Optics Analytical Chemistry Knudsen flow Nuclear magnetic resonance chemistry Effusion Lithium Knudsen number Instrumentation Spectroscopy Isotope analysis
Zdroj:	Spectrochimica Acta Part B: Atomic Spectroscopy. 58:351-359
ISSN:	0584-8547
DOI:	10.1016/s0584-8547(02)00150-7
Popis:	Reported is a comparative study of the nuclear magnetic resonance (NMR) spectrometric measurement of 6Li with the Knudsen effusion high temperature mass spectrometry (HTMS) determination of 6Li and 7Li. A limit of detection of 0.002–0.007 at.% for 6Li was achieved by NMR with the use of calibrated standard reference materials. This study has shown that 6Li NMR is effective, rapid, and a nondestructive analytical technique for the accurate isotopic analysis of Li salts enriched in 7Li up to 99.95 at.%. The relative standard deviation (RSD) for NMR 6Li determinations in highly enriched Li salts was 0.002–0.007 at.%, when the 6Li content was in the range of 0.05–0.10 at.%. Effusion Knudsen HTMS measurements of samples of various isotopic compositions of highly enriched 7Li lithium salts were completed using mass peaks of Li2Cl+ (m/z=47–51 u). The limit of detection achieved for 6Li in enriched 7Li salts was 0.0002–0.0005 at.% measured with a RSD of 0.015–0.080 at.%. Effusion Knudsen HTMS is an absolute method of analysis requiring no calibration standards.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::db052492a2b4af6a6a65bf3e14f8757a https://doi.org/10.1016/s0584-8547(02)00150-7 Zobrazit plný text záznamu Full Text from ScienceDirect