Metal-Metal Oxide and Metal Oxide Electrodes as pH Sensors

Głąb, Stanisław; Hulanicki, Adam; Edwall, G.; Ingman, Folke

doi:10.1080/10408348908048815

Cited by 156 publications

(108 citation statements)

References 111 publications

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“…In agreement with the literature, C SPEs have a very low capacitive current [42,44]. A similar result was obtained for CeO 2 SPEs, due to the high exchange current density of CeO 2 [28].…”

Section: Capacitive Currentsupporting

confidence: 79%

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Novel CeO2-based screen-printed potentiometric electrodes for pH monitoring

Betelu

Polychronopoulou

Rebholz

et al. 2011

Talanta

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Nuclear waste repositories are being installed in deep excavated rock formations in some places in Europe to isolate and store radioactive waste. In France, the Callovo-Oxfordian formation (COx) is a possible candidate for nuclear waste storage. This work investigates the applicability of CeO 2 -based oxides (CeO 2 , Ce 0.8 Sm 0.2 O 2 and Ce 0.8 Zr 0.2 O 2 ) for monitoring the pH of the COx pore water. The study is limited to the pH range between 5.5 and 13.2, which includes the pH values that have been encountered or are anticipated in the COx formation during its evolution as radioactive waste repository due mainly to alkalinisation, an increase in salinity, a decrease in redox potential. Screen-printing was done to assemble electrodes and rapidly generate data sets. The electrochemical behavior of CeO 2 -based screen-printed electrodes (CeO 2 -based SPEs) was determined by cyclic voltammetry and electrochemical impedance spectroscopy. The use of the electrodes for pH sensing was then evaluated by potentiometric measurements. The feasibility of measuring pH with CeO 2 -based SPEs was first tested in NH 4 Cl/NH 3 buffer solutions, leading to electrode calibration over the widest range of pH, from around neutral to basic pH. Experiments were then conducted in NaHCO 3 /Na 2 CO 3 buffer samples similar to conditions prevailing in the COx formation.Ce 0.8 Zr 0.2 O 2 SPEs exhibit a near-Nernstian behavior (sensitivity -(51±2)mV/pH) in the pH range 5.5-13.2 at 25 °C. Electrode response was slightly affected by the direction of the pH change. Electrode reliability was clearly demonstrated for pH monitoring. Probes based on the same components, but more durably designed, could be considered for pH measurements in radioactive waste repositories.

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“…In agreement with the literature, C SPEs have a very low capacitive current [42,44]. A similar result was obtained for CeO 2 SPEs, due to the high exchange current density of CeO 2 [28].…”

Section: Capacitive Currentsupporting

confidence: 79%

“…pH is one of the most important parameters characterizing samples [2]. Extensive efforts have been devoted to developing highly sensitive analytical procedures for measuring pH.…”

Section: Introductionmentioning

confidence: 99%

Novel CeO2-based screen-printed potentiometric electrodes for pH monitoring

Betelu

Polychronopoulou

Rebholz

et al. 2011

Talanta

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“…4(c)), which was much higher than the sensitivity of the electrochemical pH sensors based on IrOx thin films with a Nernstian and super-Nernstian response of 59 mV/pH and 62-77 mV/pH. 59,60 In addition, the effect of flow rate on the sensitivity of the pH sensor was studied. DMEM with a pH value of 7.4 was perfused through the sensor using a syringe pump at various flow rates from 2 ll/min to 60 ll/min.…”

Section: A Characterization Of the Ph Sensormentioning

confidence: 99%

A microfluidic optical platform for real-time monitoring of pH and oxygen in microfluidic bioreactors and organ-on-chip devices

et al. 2016

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There is a growing interest to develop microfluidic bioreactors and organ-on-chip platforms with integrated sensors to monitor their physicochemical properties and to maintain a well-controlled microenvironment for cultured organoids. Conventional sensing devices cannot be easily integrated with microfluidic organ-on-chip systems with low-volume bioreactors for continual monitoring. This paper reports on the development of a multi-analyte optical sensing module for dynamic measurements of pH and dissolved oxygen levels in the culture medium. The sensing system was constructed using low-cost electro-optics including light-emitting diodes and silicon photodiodes. The sensing module includes an optically transparent window for measuring light intensity, and the module could be connected directly to a perfusion bioreactor without any specific modifications to the microfluidic device design. A compact, user-friendly, and low-cost electronic interface was developed to control the optical transducer and signal acquisition from photodiodes. The platform enabled convenient integration of the optical sensing module with a microfluidic bioreactor. Human dermal fibroblasts were cultivated in the bioreactor, and the values of pH and dissolved oxygen levels in the flowing culture medium were measured continuously for up to 3 days. Our integrated microfluidic system provides a new analytical platform with ease of fabrication and operation, which can be adapted for applications in various microfluidic cell culture and organ-on-chip devices.

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“…11 Biosensors based on different types of transducers may be used for 12 highly sensitive and specific detection of pathogens [1]. However, 13 although those permit to reach good detection limits in most cases 14 they are not able to differentiate between viable and non-viable 15 cells. Conventional and standard methods of viability and 16 quantification in bacteria are traditionally associated with the 17 ability to form colonies on agar growth medium and to proliferate 18 in liquid nutrient broths.…”

mentioning

confidence: 99%

Fast determination of viable bacterial cells in milk samples using impedimetric sensor and a novel calibration method

Uría

Moral‐Vico

Abramova

et al. 2016

Electrochimica Acta

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A B S T R A C TAs a first stage toward the development of an impedimetric biosensor to quantify viable bacterial cells, this work defines the relationships between microbial growth and impedance changes associated with acidification of the culture medium. Escherichia coli bacterium was used as a model of a common pathogenic bacterium found in a foodstuff. Impedance was measured at a fix frequency of 10 kHz using interdigitated microelectrodes. Impedance changes were found to depend on the number of microorganisms in a sample. However, as the kinetics greatly depends on the bacterial concentration, it was not possible to obtain a single calibration curve in a wide concentration range at a fixed incubation time. To resolve this, a novel calibration method was proposed by measuring the sensor response at 270 and 390 min of incubation and taking a mean value. Obtained calibration plots were used to determine E. coli in a spiked milk samples. Performed experiments demonstrated the capacity of the method to detect E.coli concentrations in a range between 10 2 and 10 6 cfu mL À1 in milk in only 6 hours with 5-12% error margin.

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Metal-Metal Oxide and Metal Oxide Electrodes as pH Sensors

Cited by 156 publications

References 111 publications

Novel CeO2-based screen-printed potentiometric electrodes for pH monitoring

Novel CeO2-based screen-printed potentiometric electrodes for pH monitoring

A microfluidic optical platform for real-time monitoring of pH and oxygen in microfluidic bioreactors and organ-on-chip devices

Fast determination of viable bacterial cells in milk samples using impedimetric sensor and a novel calibration method

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