The Use of Bi-Potentiostat as a Simple and Accurate Electrochemical Approach for the Determination of Orthophosphate in Seawater

Altahan, Mahmoud Fatehy; Espósito, Mario; Bogner, Boie; Achterberg, Eric P.

doi:10.3390/s23042123

Cited by 4 publications

(3 citation statements)

References 41 publications

(43 reference statements)

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“…Recent work has been published on the determination of phosphate on molybdate/carbon paste electrode pretreated with Sodium chloride solution and used for square wave voltammetry of orthophosphate 19 . The application of the proposed method was also reported into a prototype based on the Bi-potentiostat technique into flow injection analysis 20 .…”

Section: Introductionmentioning

confidence: 99%

A new approach for determination of orthophosphate based on mixed valent molybdenum oxide/poly 1,2-diaminoanthraquinone in seawater

Altahan,

AbdelAzzem

2023

Sci Rep

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Orthophosphate is an essential macronutrient in natural water that controls primary production and strongly influences the global ocean carbon cycle. Electrochemical determination of orthophosphate is highly recommended because electrochemistry provides the simplest means of determination. Here the determination of orthophosphate based on the formation of a phosphomolybdate complex is reported. Mixed-valent molybdenum oxide (MoxOy) was prepared by cyclic voltammetry on poly-1,2-diaminoanthraquinone (1,2-DAAQ), which was performed by cyclic voltammetry on the surface of a glassy carbon electrode under pre-optimized conditions for the thickness of the modified electrode layers. The proposed modified electrode was used for square-wave voltammetry of orthophosphate ions under pre-optimized square-wave parameters (i.e., frequency and amplitude) in strongly acidic medium (pH < 1). The linear range was 0.05–4 µM with a limit of quantification (LOD) of 0.0093 µM with no effect on two peaks due to cross interference from silicate. Furthermore, MoxOy/PDAAQ shows good reproducibility with a relative standard deviation (RSD) of 2.17% for the peak at 0.035 V and 3.56% for the peak at 0.2 V. Real seawater samples were also analyzed for PO43− analysis by UV spectrophotometry and the results were compared with the measurement results of our proposed electrode, with good recoveries obtained.

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Section: Introductionmentioning

confidence: 99%

A new approach for determination of orthophosphate based on mixed valent molybdenum oxide/poly 1,2-diaminoanthraquinone in seawater

Altahan,

AbdelAzzem

2023

Sci Rep

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“…Interestingly, the AuNP-pSi nanozyme shows a dual linear working range for Hcy in a biphasic calibration curve. Dual-working linear range is a well-documented phenomenon for many types of sensors including nanozyme sensors. , Typically, as the analyte concentration increases, the sensor surface becomes saturated and the calibration curve shows a plateau. For most sensors, the calibration curve plateauing shows a smooth transition from a linear stage to saturation, whereas the complex chemical interactions on the surface of many other sensors show an abrupt plateauing.…”

Section: Resultsmentioning

confidence: 99%

On-Demand Activatable Peroxidase-like Porous Silicon–Gold Nanozymes for Colorimetric Sensing

Saeed,

Jain,

Kokil

et al. 2024

ACS Appl. Nano Mater.

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Nanozymes have shown promise in a range of applications including food safety, environmental monitoring, clinical diagnostics, and bioimaging. However, more complex applications of nanozymes require better control over their catalytical properties. Herein, we report a peroxidase-like nanozyme that can be activated "on demand". This is based on porous silicon (pSi) particles with nanosized gold inclusion, which are spontaneously generated on their surface by simple addition of a gold solution to a pSi particle suspension. The fast and spontaneous formation of gold nanoparticles (AuNPs) activates peroxidase-like nanozyme features. The nanozymes mimic the enzyme−cofactor relationship of natural enzymes with "on-demand" activation. The Michaelis−Menten constant and maximum velocity parameters were obtained as 1.92 mM and 0.37 × 10 −8 MS −1 for tetramethylbenzidine and 0.70 mM and 0.55 × 10 −8 MS −1 for H 2 O 2 , respectively. The activatable AuNP-pSi nanohybrid exhibited strong nanozyme activity with the ability to detect a thiol groupcontaining amino acid, homocysteine (Hcy), with a limit of detection of 0.30 μM. Our findings demonstrated that AuNP-pSi nanozymes can detect Hcy in complex solvents such as human serum efficiently. The AuNP-pSi nanozymes offer a robust stability profile without significant activity loss after 12 weeks of a storage period at room temperature. The AuNP-pSi nanozymes have potential in the development of colorimetric sensors and chemical industry processes that require enzymatic activity to switch on at specific parts of the reaction steps.

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“…[15][16][17][18] The development of these electrodes involved both a laboratory bench and field prototyping. [19][20][21][22][23] This work would help increase investment and further expand reliance on deployable sensors for water quality monitoring. 24 In this study, we employed 1-aminoanthraquinone as a conductive polymer to augment the performance of the electrode.…”

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confidence: 99%

Accurate and Rapid Determination of Ammonium in Water by Voltametric Analysis on a Novel Modified Electrode

Altahan,

AbdelAzzem,

El-Attar

2024

J. Electrochem. Soc.

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The development of efficient and sensitive electrochemical sensors is of critical importance for a wide range of applications, including environmental monitoring, chemical analysis, and biomedical diagnostics. In this study, we report on the design and characterization of a new type of electrochemical sensor, based on a silver/poly 1-aminoanthraquinone/glassy carbon modified electrode (Ag/PAAQ/GC), which demonstrates high sensitivity and selectivity for the detection of ammonium ion (NH4+) in water. The results demonstrated that the Ag/PAAQ/GC electrode has a linear response to NH4+ in a concentration range of 0.01 to 9 mgL-1, with a detection limit of 3 µgL-1 and a sensitivity of 0.0413 μA.Lmg-1. Furthermore, the Ag/PAAQ/GC electrode exhibited excellent selectivity towards NH4+ over interfering ions such as K+, Na+, Ca2+, and Mg2+. Overall, our results demonstrate that the Ag/PAAQ/GC electrode represents a promising platform for the development of advanced electrochemical sensors for NH4+ detection in water. The high sensitivity, selectivity, and stability of the Ag/PAAQ/GC electrode make it suitable for a wide range of environmental and analytical applications, such as water quality monitoring, wastewater treatment, and fertilizers analysis.

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The Use of Bi-Potentiostat as a Simple and Accurate Electrochemical Approach for the Determination of Orthophosphate in Seawater

Cited by 4 publications

References 41 publications

A new approach for determination of orthophosphate based on mixed valent molybdenum oxide/poly 1,2-diaminoanthraquinone in seawater

A new approach for determination of orthophosphate based on mixed valent molybdenum oxide/poly 1,2-diaminoanthraquinone in seawater

On-Demand Activatable Peroxidase-like Porous Silicon–Gold Nanozymes for Colorimetric Sensing

Accurate and Rapid Determination of Ammonium in Water by Voltametric Analysis on a Novel Modified Electrode

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