Use of the Relaxometry Technique for Quantification of Paramagnetic Ions in Aqueous Solutions and a Comparison with Other Analytical Methods

Autor: Bruna Ferreira Gomes, Juliana Soares da Silva Burato, Carlos Manuel Silva Lobo, Luiz Alberto Colnago
Jazyk: angličtina
Rok vydání: 2016
Předmět:
Zdroj: International Journal of Analytical Chemistry, Vol 2016 (2016)
Druh dokumentu: article
ISSN: 1687-8760
1687-8779
DOI: 10.1155/2016/8256437
Popis: We have demonstrated that the relaxometry technique is very efficient to quantify paramagnetic ions during in situ electrolysis measurements. Therefore, the goal of this work was to validate the relaxometry technique in the determination of the concentration of the ions contained in electrolytic solutions, Cu2+, Ni2+, Cr3+, and Mn2+, and compare it with other analytical methods. Two different NMR spectrometers were used: a commercial spectrometer with a homogeneous magnetic field and a home-built unilateral sensor with an inhomogeneous magnetic field. Without pretreatment, manganese ions do not have absorption bands in the UV-Visible region, but it is possible to quantify them using relaxometry (the limit of quantification is close to 10−5 mol L−1). Therefore, since the technique does not require chemical indicators and is a cheap and robust method, it can be used as a replacement for some conventional quantification techniques. The relaxometry technique could be applied to evaluate the corrosion of metallic surfaces.
Databáze: Directory of Open Access Journals
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