Amperometric Detection of Isoprenaline Based on Glassy Carbon Electrode Modified by Iridium Oxide Nanoparticles

Roushani, Mahmoud; Farokhi, Somayeh

doi:10.5935/0103-5053.20150069

Cited by 2 publications

(2 citation statements)

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“…The pH sensing mechanism of IrOx films is based on the equilibrium between oxides, in which the iridium has different oxidation states [ 22 ]. Generally, the mechanism could be described as the following reaction [ 49 ]:

where the values of n , x , and y varied with the preparation method of IrOx, and are essential for determination of the potential response. Thermal oxidation or sputtering methods usually yield anhydrous IrOx films, which have near-Nernstian response with the sensitivity of about 59 mV/pH, because there is an electron per proton transferred in the redox reaction.…”

Section: Resultsmentioning

confidence: 99%

Fabrication of a Miniature Multi-Parameter Sensor Chip for Water Quality Assessment

Zhou

Bian

Tong

et al. 2017

Sensors

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Water contamination is a main inducement of human diseases. It is an important step to monitor the water quality in the water distribution system. Due to the features of large size, high cost, and complicated structure of traditional water determination sensors and devices, it is difficult to realize real-time water monitoring on a large scale. In this paper, we present a multi-parameter sensor chip, which is miniature, low-cost, and robust, to detect the pH, conductivity, and temperature of water simultaneously. The sensor chip was fabricated using micro-electro-mechanical system (MEMS) techniques. Iridium oxide film was electrodeposited as the pH-sensing material. The atomic ratio of Ir(III) to Ir(IV) is about 1.38 according to the X-ray photoelectron spectroscopy (XPS) analysis. The pH sensing electrode showed super-Nernstian response (−67.60 mV/pH) and good linearity (R2 = 0.9997), in the range of pH 2.22 to pH 11.81. KCl-agar and epoxy were used as the electrolyte layer and liquid junction for the solid-state reference electrode, respectively, and its potential stability in deionized water was 56 h. The conductivity cell exhibited a linear determination range from 21.43 sans-serifμnormalS/cm to 1.99 mS/cm, and the electrode constant was 1.566 cm−1. Sensitivity of the temperature sensor was 5.46 sans-serifΩ/°normalC. The results indicate that the developed sensor chip has potential application in water quality measurements.

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Section: Resultsmentioning

confidence: 99%

Fabrication of a Miniature Multi-Parameter Sensor Chip for Water Quality Assessment

Zhou

Bian

Tong

et al. 2017

Sensors

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“…Many electrochemical methods proposed to quantify IP require the modification of the electrode surface to achieve the sensitivity and/or selectivity needed. Different materials, such as polymers [ 15 ] or nanostructures like multiwalled carbon nanotubes [ 3 , 5 , 17 , 18 ], graphene [ 7 ], hollow carbon spheres [ 16 ], or iridium oxide nanoparticles [ 19 ], have been proposed to modify the electrode surface. Recently, an electrochemical sensor which contains lanthanum doped zinc oxide and reduced graphene oxide has been described for the selective determination of IP overcoming interference problems [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

Spectroelectrochemical Determination of Isoprenaline in a Pharmaceutical Sample

Olmo

Garoz‐Ruiz

Carazo

et al. 2020

Sensors

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UV/Vis absorption spectroelectrochemistry (SEC) is a multi-response technique that has been commonly used for the characterization of materials and the study of reaction mechanisms. However, it has been scarcely used for quantitative purposes. SEC allows us to obtain two analytical signals simultaneously, yielding a dual sensor in just one experiment. In the last years, our group has developed new devices useful for analysis. In this work, a SEC device in parallel configuration, based on optical fibers fixed on screen-printed electrodes, was used to determine isoprenaline in a commercial drug, using both, the electrochemical and the spectroscopic signals. In this commercial drug, isoprenaline is accompanied in solution by other compounds. Among them is sodium metabisulfite, an antioxidant that strongly interferes in the isoprenaline determination. A simple pretreatment of the drug sample by bubbling wet-air allows us to avoid the interference of metabisulfite. Here, we demonstrate again the capabilities of UV/Vis absorption SEC as double sensor for analysis and we propose a simple pretreatment to remove interfering compounds.

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Amperometric Detection of Isoprenaline Based on Glassy Carbon Electrode Modified by Iridium Oxide Nanoparticles

Cited by 2 publications

References 0 publications

Fabrication of a Miniature Multi-Parameter Sensor Chip for Water Quality Assessment

Fabrication of a Miniature Multi-Parameter Sensor Chip for Water Quality Assessment

Spectroelectrochemical Determination of Isoprenaline in a Pharmaceutical Sample

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