Interference of Lithium in Measuring Magnesium by Complexometry: Discussions of the Mechanism

Interference of Lithium in Measuring Magnesium by Complexometry: Discussions of the Mechanism

There is usually a large concentration of magnesium in the brine of salt lakes and as a consequence it is difficult to measure Mg2+ accurately with the complexometric titration by ethylenediaminetetraacetic acid disodium salt (EDTA) because of the large levels of Li+ also coexisting in brine samples...

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Main Authors: Jie Gao, Yafei Guo, Shiqiang Wang, Tianlong Deng, Yu-Wei Chen, Nelson Belzile
Format: Article
Language:English
Published: Hindawi Limited 2013-01-01
Series:Journal of Chemistry
Online Access:http://dx.doi.org/10.1155/2013/719179
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spelling doaj-038a295b23a74278b7ad62dd292ca7252020-11-24T21:17:04ZengHindawi LimitedJournal of Chemistry2090-90632090-90712013-01-01201310.1155/2013/719179719179Interference of Lithium in Measuring Magnesium by Complexometry: Discussions of the MechanismJie Gao0Yafei Guo1Shiqiang Wang2Tianlong Deng3Yu-Wei Chen4Nelson Belzile5Tianjin Key Laboratory of Marine Resources and Chemistry, College of Marine Science & Engineering, Tianjin University of Science & Technology, Tianjin 300457, ChinaTianjin Key Laboratory of Marine Resources and Chemistry, College of Marine Science & Engineering, Tianjin University of Science & Technology, Tianjin 300457, ChinaTianjin Key Laboratory of Marine Resources and Chemistry, College of Marine Science & Engineering, Tianjin University of Science & Technology, Tianjin 300457, ChinaTianjin Key Laboratory of Marine Resources and Chemistry, College of Marine Science & Engineering, Tianjin University of Science & Technology, Tianjin 300457, ChinaDepartment of Chemistry & Biochemistry, Laurentian University, Sudbury, ON, P3E 2C6, CanadaDepartment of Chemistry & Biochemistry, Laurentian University, Sudbury, ON, P3E 2C6, CanadaThere is usually a large concentration of magnesium in the brine of salt lakes and as a consequence it is difficult to measure Mg2+ accurately with the complexometric titration by ethylenediaminetetraacetic acid disodium salt (EDTA) because of the large levels of Li+ also coexisting in brine samples. In this study, a relationship between the relative error related to the number of drops of the indicator and the NMR spectra of anhydrous ethanol and n-butanol, with or without LiCl, was analyzed and compared. It was then possible to suggest a mechanism to explain the interference of Li+ when measuring Mg2+ and to control the interference in the alcohol mixture because Li+ can then complex with the alcohols and mainly form a complex with n-butanol.http://dx.doi.org/10.1155/2013/719179
collection DOAJ
language English
format Article
sources DOAJ
author Jie Gao
Yafei Guo
Shiqiang Wang
Tianlong Deng
Yu-Wei Chen
Nelson Belzile
spellingShingle Jie Gao
Yafei Guo
Shiqiang Wang
Tianlong Deng
Yu-Wei Chen
Nelson Belzile
Interference of Lithium in Measuring Magnesium by Complexometry: Discussions of the Mechanism
Journal of Chemistry
author_facet Jie Gao
Yafei Guo
Shiqiang Wang
Tianlong Deng
Yu-Wei Chen
Nelson Belzile
author_sort Jie Gao
title Interference of Lithium in Measuring Magnesium by Complexometry: Discussions of the Mechanism
title_short Interference of Lithium in Measuring Magnesium by Complexometry: Discussions of the Mechanism
title_full Interference of Lithium in Measuring Magnesium by Complexometry: Discussions of the Mechanism
title_fullStr Interference of Lithium in Measuring Magnesium by Complexometry: Discussions of the Mechanism
title_full_unstemmed Interference of Lithium in Measuring Magnesium by Complexometry: Discussions of the Mechanism
title_sort interference of lithium in measuring magnesium by complexometry: discussions of the mechanism
publisher Hindawi Limited
series Journal of Chemistry
issn 2090-9063
2090-9071
publishDate 2013-01-01
description There is usually a large concentration of magnesium in the brine of salt lakes and as a consequence it is difficult to measure Mg2+ accurately with the complexometric titration by ethylenediaminetetraacetic acid disodium salt (EDTA) because of the large levels of Li+ also coexisting in brine samples. In this study, a relationship between the relative error related to the number of drops of the indicator and the NMR spectra of anhydrous ethanol and n-butanol, with or without LiCl, was analyzed and compared. It was then possible to suggest a mechanism to explain the interference of Li+ when measuring Mg2+ and to control the interference in the alcohol mixture because Li+ can then complex with the alcohols and mainly form a complex with n-butanol.
url http://dx.doi.org/10.1155/2013/719179
work_keys_str_mv AT jiegao interferenceoflithiuminmeasuringmagnesiumbycomplexometrydiscussionsofthemechanism
AT yafeiguo interferenceoflithiuminmeasuringmagnesiumbycomplexometrydiscussionsofthemechanism
AT shiqiangwang interferenceoflithiuminmeasuringmagnesiumbycomplexometrydiscussionsofthemechanism
AT tianlongdeng interferenceoflithiuminmeasuringmagnesiumbycomplexometrydiscussionsofthemechanism
AT yuweichen interferenceoflithiuminmeasuringmagnesiumbycomplexometrydiscussionsofthemechanism
AT nelsonbelzile interferenceoflithiuminmeasuringmagnesiumbycomplexometrydiscussionsofthemechanism
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