Fabrication of new solid state phosphate selective electrodes for environmental monitoring

Tafesse, Fikru; Enemchukwu, Martin E

doi:10.1016/j.talanta.2010.11.045

Cited by 27 publications

(9 citation statements)

References 14 publications

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“…19 Potentiometric evaluation of the concentration of phosphate using ion-selective electrodes (ISEs) is one of prime candidates, since it is a fast, portable, simple, low cost and accurate analytical method. 18,[20][21][22] Several phosphate ISEs constructed by metal | metal phosphate electrodes, [23][24][25][26][27][28] surface modified electrodes 29 and liquid membrane electrodes 30 have been reported.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of a Phosphate Ion Selective Electrode Based on Modified Molybdenum Metal

Kitazumi

Kano

et al. 2019

ANAL. SCI.

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A phosphate ion-selective electrode using molybdenum metal was constructed. The modified molybdenum electrode responded to HPO4 2in the presence of molybdenum dioxide and molybdophosphate (PMo12O40 3-) on the surface. The electrode exhibited a linear response to HPO4 2in the concentration range between 1.0 × 10 -5 and 1.0 × 10 -1 M (mol dm -3 ) in the pH range from 8.0 to 9.5 with a detection limit of 1.0 × 10 -6 M. The sensor showed near Nernstian characteristics (27.8 ± 0.5 mV dec -1 ) at pH 9.0. Since the responding potential was attributed to the activity of HPO4 2-, the potential at a given concentration of phosphate depended on the pH. The electrode indicated a good selectivity with respect to other common anions such as NO3 -, SO4 2-, Cl -, HCO3and CH3COO -. The modified molybdenum electrode can be continuously used for over a 1 month with good reproducibility. The feasibility of the electrochemical sensor was proved by successful for the detection of phosphate in real samples.

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Section: Introductionmentioning

confidence: 99%

Fabrication of a Phosphate Ion Selective Electrode Based on Modified Molybdenum Metal

Kitazumi

Kano

et al. 2019

ANAL. SCI.

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“…A variety of electrochemical sensing techniques have been investigated to detect orthophosphate ions in aqueous solution, summarised in reviews by Midgley (1986), Engblom (1998), Villalba et al (2009) and Warwick et al (2013). However, sensors capable of measuring the range of P concentrations (0.1 to 15 mg/l) typically found in wastewater, either suffer from limited durability, poor selectivity, or both (Ganjali et al, 2006;Kumar et al, 2008;Kumar et al, 2010;Tafesse and Enemchukwu, 2011;Modi et al, 2011). Selectivity issues and doubts regarding suitability for field use with environmental samples are also found with fluorescent based, optical sensors (Beer and Cadman, 1999;Ojida et al, 2002;Ojida et al, 2004;Hamachi, 2009).…”

Section: Introductionmentioning

confidence: 99%

Conductance based sensing and analysis of soluble phosphates in wastewater

Warwick

Guerreiro

Gómez‐Caballero

et al. 2014

Biosensors and Bioelectronics

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The current standard method used for measuring soluble phosphate in environmental water samples is based on a colourimetric approach, developed in the early 1960s. In order to provide an alternative, label free sensing solution, a molecularly imprinted polymer (MIP) was designed to function as a phosphate receptor. A combination of functional monomer (N-allylthiourea), cross-linker and monomer/template ratios were optimised in order to maximise the binding capacity for phosphate. When produced in membrane format, the MIP's ability to produce a reversible change in conductance in the presence of phosphate was explored for fabrication of a sensor which was able to selectively detect the presence of phosphate compared to sulphate, nitrate and chloride. In wastewater samples the sensor had a limit of detection of 0.16 mg P/l, and a linear range between 0.66 and 8 mg P/l. This is below the minimum monitoring level (1 mg P/l) as required by current legislation for wastewater discharges, making the sensor as developed promising for direct quantification of phosphate in environmental monitoring applications.

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“…However, the electrode had to be calibrated under controlled conditions. A solid state phosphate ion-selective electrode framed by a crystal disk was used by Tafesse and Enemchukwu (2011). The electrode was made of aluminum (Al), aluminum phosphate (AlPO 4 ), and copper (Cu).…”

Section: Electrochemical Techniquesmentioning

confidence: 99%

Sensing Technology for Rapid Detection of Phosphorus in Water: A Review

Islam¹,

Reza²,

Jeong³

et al. 2016

Journal of Biosystems Engineering

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Purpose: Phosphorus is an essential element for water quality control. Excessive amounts of phosphorus causes algal bloom in water, which leads to eutrophication and a decline in water quality. It is necessary to maintain the optimum amount of phosphorus present. During the last decades, various studies have been conducted to determine phosphorus content in water. In this study, we present a comprehensive overview of colorimetric, electrochemical, fluorescence, microfluidic, and remote sensing technologies for the measurement of phosphorus in water, along with their working principles and limitations. Results: The colorimetric techniques determine the concentration of phosphorus through the use of colorgenerating reagents. This is specific to a single chemical species and inexpensive to use. The electrochemical techniques operate by using a reaction of the analyte of interest to generate an electrical signal that is proportional to the sample analyte concentration. They show a good linear output, good repeatability, and a high detection capacity. The fluorescence technique is a kind of spectroscopic analysis method. The particles in the sample are excited by irradiation at a specific wavelength, emitting radiation of a different wavelength. It is possible to use this for quantitative and qualitative analysis of the target analyte. The microfluidic techniques incorporate several features to control chemical reactions in a micro device of low sample volume and reagent consumption. They are cheap and rapid methods for the detection of phosphorus in water. The remote sensing technique analyzes the sample for the target analyte using an optical technique, but without direct contact. It can cover a wider area than the other techniques mentioned in this review. Conclusion: It is concluded that the sensing technologies reviewed in this study are promising for rapid detection of phosphorus in water. The measurement range and sensitivity of the sensors have been greatly improved recently.

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Fabrication of new solid state phosphate selective electrodes for environmental monitoring

Cited by 27 publications

References 14 publications

Fabrication of a Phosphate Ion Selective Electrode Based on Modified Molybdenum Metal

Fabrication of a Phosphate Ion Selective Electrode Based on Modified Molybdenum Metal

Conductance based sensing and analysis of soluble phosphates in wastewater

Sensing Technology for Rapid Detection of Phosphorus in Water: A Review

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