Interference-free coulometric titration of water in lithium bis(oxalato)borate using Karl Fischer reagents based on N-methylformamide
2006 (English)In: Talanta: The International Journal of Pure and Applied Analytical Chemistry, ISSN 0039-9140, Vol. 69, no 1, 276-280 p.Article in journal (Refereed) Published
A non-alcoholic coulometric reagent based on N-methylformamide (NMF) was shown to eliminate the severe interference effect caused by the alcohol component of the conventional Karl Fischer (KF) reagent on the battery electrolyte lithium bis(oxalato)borate (LiBOB). For sample amounts up to 240 μg of water, the stoichiometry of the KF reaction deviated only slightly from the ideal 1:1 ratio for the best reagent composition. Both solid and dissolved (in acetonitrile, tetrahydrofuran (THF), and ethylene carbonate/ethyl methyl carbonate) LiBOB were titrated successfully using a Metrohm 756 KF Coulometer with a diaphragm cell. The detection limit was estimated to be 0.5–1 μg of water using 100 ml of reagent in this system.
Place, publisher, year, edition, pages
2006. Vol. 69, no 1, 276-280 p.
N-Methylformamide; Non-alcoholic KF reagent; Lithium bis(oxalato)borate; Water determination
IdentifiersURN: urn:nbn:se:umu:diva-12418DOI: doi:10.1016/j.talanta.2005.10.004OAI: oai:DiVA.org:umu-12418DiVA: diva2:152089