Use of the Relaxometry Technique for Quantification of Paramagnetic Ions in Aqueous Solutions and a Comparison with Other Analytical Methods. (17th May 2016)

• Record Type: Journal Article
• Authors: Gomes, Bruna Ferreira; Burato, Juliana Soares da Silva; Silva Lobo, Carlos Manuel; Colnago, Luiz Alberto
• Other Names: Tanner Peter A. Academic Editor.
• Is Part Of: International journal of analytical chemistry. Volume 2016(2016)
• Publication Date: 2016-05-17
• Subjects: Chemistry, Analytic -- Periodicals; 543.05
• DOI: 10.1155/2016/8256437
• Languages: English
• ISSNs: 1687-8760

Abstract

Abstract : 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, Cu 2+, Ni 2+, Cr 3+, and Mn 2+, 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.