Response of a copper(II) and iron(III) ion-selective electrode bielectrode array in saline media

Abstract

A bielectrode array comprising a jalpaite membrane (i.e., Ag(1.5)Cu(0.5)S) copper(II) ion-selective electrode (ISE) and chalcogenide glass membrane (i.e., Fe(2.5)(Se(60)Ge(28)Sb(12))(97.5)) iron(III) ISE has been assembled by individually wiring each solid-state sensor into a single electrode body. Furthermore, a dual metal ion buffer calibration standard incorporating copper(II) and iron(III) coordinating ligands to regulate the levels of free copper(II) and iron(III) in the buffer has been developed to enable simultaneous calibration of the bielectrode ISE array. In this work, the bielectrode ISE array has been employed in the continuous flow analysis (CFA) of free copper(II) and iron(III) in seawater media. It is shown that the individual electrodes displayed Nernstian response in the metal ion buffer calibration standard over a wide dynamic range (viz., 10(-15) to 10(-5) M aCu(2+) and 10(-21) to 10(-11) M aFe(3+)), and the results of repetitive CFA analyses of free copper(II) and iron(III) in seawater are commensurate with the typical values found in coastal seawater samples. Clearly, the bielectrode ISE array may be used in the simultaneous analysis of free copper(II) and iron(III) in seawater without fear of cross-interference between the solid-state sensors.

Optical sensor: a promising strategy for environmental and biomedical monitoring of ionic species

“…Copper(II) ion, the third most abundant element aer iron and zinc, 62,63 is an essential trace element and plays a crucial role in many biological systems. 64,65 It has been found in numerous proteins and as a catalytic cofactor for a variety of metalloenzymes such as superoxide dismutase, lysyl oxidase, cytochrome c oxidase, dopamine-hydroxylase, and tyrosinase. 66,67 It plays a role in many major functions inside organisms, including electron transfer and O 2 metabolism and transit and is directly involved in Fe metabolism via ceruloplasmin, which has the capability to oxidize Fe before being transported in the blood to all the tissues.…”

Critical review perspective: elemental speciation analysis methods in environmental chemistry - moving towards methodological integration

“…Using synchrotron radiation-grazing incidence X-ray diffraction (GSR-GIXRD) and EC impedance spectroscopy (EIS), De Marco et al have recently shown that chloride and hydroxide were responsible for the oxidative dissolution of the Fe III chalcogenide glass ISE. [58] Interestingly, they realised that NOM and other organic compounds (e.g. EDTA, citrate) prevent this oxidation.…”

A colorimetric and fluorescent chemosensor for selective detection of Cu2+ based on a new diarylethene with a benzophenone hydrazone unit

“…Copper is an essential trace element and plays many important roles in many biological systems. Its biochemical function in the body is mainly catalytic action, as the third most abundant transition metal after iron and zinc. The synthesis of many important enzymes, such as cytochrome oxidase, superoxide dismutase, tyrosinase, dopamine β‐hydroxylase, lysyl oxidase and ceruloplasmin, involves copper ions .…”