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Issue 10, 2016

Simultaneous quantification of ion pairs in water via infrared attenuated total reflection spectroscopy

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Abstract

In this study, ion pairs in aqueous solution were quantitatively and simultaneously determined via infrared attenuated total reflection (IR-ATR) spectroscopy. Seven salts that are occurring in natural seawater, i.e., NaCl, KCl, NaBr, KBr, MgCl2, CaCl2, and Na2SO4 were investigated. Multivariate data analysis was used to discriminate and assign the spectral information arising from each salt in calibration mixtures, each containing a mixture of all constituents in different concentrations. The algorithm was able to discriminate between NaCl/KCl, NaBr/KBr, MgCl2, CaCl2, and Na2SO4 with sodium and potassium chloride, and bromide being treated as sum parameters, respectively. An additional multivariate model was able to distinguish between NaCl, KCl, NaBr, and KBr including their simultaneous quantification. Finally, a sample of real seawater was analyzed, with the established model. MgCl2 could be correctly quantified at 0.5 ± 0.05% (w/v) in this sample, whilst the other ions obviously demand for a more precise and complex calibration model, which is more similar to real seawater.

Graphical abstract: Simultaneous quantification of ion pairs in water via infrared attenuated total reflection spectroscopy

Supplementary files

Article information


Submitted
01 Nov 2015
Accepted
05 Feb 2016
First published
10 Feb 2016

This article is Open Access

Anal. Methods, 2016,8, 2164-2169
Article type
Paper

Simultaneous quantification of ion pairs in water via infrared attenuated total reflection spectroscopy

F. Rauh and B. Mizaikoff, Anal. Methods, 2016, 8, 2164 DOI: 10.1039/C5AY02874D

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

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