Abstract
Voltammetric responses associated with the simple reaction of perrhenate anions transfer across polarized micro-interfaces between two immiscible electrolyte solutions (micro-ITIES) was investigated, and their sensing applications were demonstrated. The micro-ITIES array was formed at polyethylene terephthalate membranes containing a 196 microhole array of radius 10.0±0.1 μm using a femtosecond laser. The characteristics of perrhenate ions transfer at the water/2-nitrophenyloctyl ether interface were first investigated using cyclic voltammetry (CV). CV was used in the estimation of some of the perrhenate anions thermodynamic parameters, such as the formal transfer potential and the Gibbs transfer energy. The technique of alternating current stripping voltammetry (ACSV) was also utilized to improve the sensitivity of the perrhenate anion detection. Under optimized preconcentration and detection conditions, a limit of detection of 0.3 μM with a wide linear dynamic range extending from 1.0 to 100 μM was achieved. The effect of various potential interfering anions on the perrhenate sensor was also investigated and an excellent selectivity over SCN-, I-, NO3-, NO2-, CO32-, SO42-, MoO42-, WO42- and CH3COO- ions was also achieved. This enabled quantitative measurements of rhenium in some mineral raw samples and the data was also validated by comparing with inductively coupled plasma atomic emission spectroscopy.
Highlights
ANALYTICAL METHODS IN CHEMISTRY AND CHEMICAL TECHNOLOGYThe effect of various potential interfering anions on the perrhenate sensor was investigated and an excellent selectivity over SCN−, I−, NO3–, NO2−, CO32−, SO42−, MoO42–, WO42– and CH3COO− ions was achieved
The analysis of various species of rhenium is of great importance due to its unique physicochemical properties and wide application in various fields of chemical, aerospace and nuclear industries [1, 2]
The content of rhenium in rhenium-containing raw materials varies in a wide range of concentrations – from 10–7 to tens of weight percent. This leads to the creation and improvement of methods for its analytical control in different materials [7]. Methods such as inductively coupled plasma atomic emission spectroscopy (ICP AES) [8], inductively coupled plasma – mass spectrometry (ICP-MS) [9], X-ray fluorescence analysis [10] and spectrophotometric methods [11] are used for direct determination of rhenium in the aqueous phase
Summary
The effect of various potential interfering anions on the perrhenate sensor was investigated and an excellent selectivity over SCN−, I−, NO3–, NO2−, CO32−, SO42−, MoO42–, WO42– and CH3COO− ions was achieved. This enabled quantitative measurements of rhenium in some mineral raw samples and the data was validated by comparing with inductively coupled plasma atomic emission spectroscopy. Кeywords: perrhenate ion, water/2-nitrophenyloctyl ether interface, micro-ITIES, ion transfer reaction, femtosecond laser, stripping voltammetry. Настоящая работа посвящена изучению простого ионного переноса перренат-иона через поляризуемую микрограницу раздела фаз двух несмешивающихся растворов электролитов (микро-ГРДНРЭ) и применению данного явления для аналитического определения рения. Ключевые слова: перренат-ион, вода/2-нитрофенилоктиловый эфир, микро-ГРДНРЭ, реакция ионного переноса, фемтосекундный лазер, инверсионная вольтамперометрия
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