Electrochemical microsensor based on gold nanoparticles modified electrode for total phosphorus determinations in water

Bai, Yin; Tong, Jianhua; Wang, Jinfen; Bian, Chao; Xia, Shanhong

doi:10.1049/iet-nbt.2013.0041

Cited by 26 publications

(23 citation statements)

References 12 publications

(14 reference statements)

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“…Cyclic voltammograms of glyphosate conducted with gold working electrodes have revealed that oxidation occurs at 0.78 V. Earlier studies have reported that a strong interaction occurs between phosphorous and gold [ 13 , 14 , 15 , 16 ]. A study that aimed to detect the total phosphorus concentration in water showed a three-fold signal enhancement when introducing gold nanoparticles to the working electrode surface [ 17 ].…”

Section: Discussionmentioning

confidence: 99%

Detection of Glyphosate in Drinking Water: A Fast and Direct Detection Method without Sample Pretreatment

Noori

Dimaki

Mortensen

et al. 2018

Sensors

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Glyphosate (Gly) is one of the most problematic pesticides that repeatedly appears in drinking water. Continuous on-site detection of Gly in water supplies can provide an early warning in incidents of contamination, before the pesticide reaches the drinking water. Here, we report the first direct detection of Gly in tap water with electrochemical sensing. Gold working electrodes were used to detect the pesticide in spiked tap water without any supporting electrolyte, sample pretreatment or electrode modifications. Amperometric measurements were used to quantify Gly to a limit of detection of 2 μM, which is below the regulation limit of permitted contamination of drinking water in the United States. The quantification of Gly was linearly proportional with the measured signal. The selectivity of this method was evaluated by applying the same technique on a Gly Metabolite, AMPA, and on another pesticide, omethoate, with a chemical structure similar to Gly. The testing revealed no interfering electrochemical activity at the potential range used for Gly detection. The simple detection of Gly presented in this work may lead to direct on-site monitoring of Gly contamination at drinking water sources.

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Section: Discussionmentioning

confidence: 99%

Detection of Glyphosate in Drinking Water: A Fast and Direct Detection Method without Sample Pretreatment

Noori

Dimaki

Mortensen

et al. 2018

Sensors

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“…Table 1 shows the differences between some different gold microsensors for phosphate determination. Compared with chronoamperometry for the detection of phosphate [ 21 , 22 ], this microsensor using LSV method has a much higher current response and less background current influence.…”

Section: Resultsmentioning

confidence: 99%

“…The determination of phosphate has been performed by voltammetry with carbon paste electrodes [ 15 ], gold microdisk electrodes [ 16 ], and glassy carbon electrodes [ 17 ], and amperometric procedures are also reported [ 18 , 19 ]. Several studies on gold electrodes based on molybdophosphate complex with an electrochemical method for phosphate detection have already been published, however, the current response is very low under the selected voltage using the chronoamperometry method [ 20 – 22 ].…”

Section: Introductionmentioning

confidence: 99%

An Electrochemical Microsensor Based on a AuNPs-Modified Microband Array Electrode for Phosphate Determination in Fresh Water Samples

Wang

Tong

et al. 2014

Sensors

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This work describes the fabrication, characterization, and application of a gold microband array electrode (MAE) for the determination of phosphate in fresh water samples. The working principle of this MAE is based on the reduction of a molybdophosphate complex using the linear sweep voltammetric (LSV) method. The calibration of this microsensor was performed with standard phosphate solutions prepared with KH2PO4 and pH adjusted to 1.0. The microsensor consists of a platinum counter electrode, a gold MAE as working electrode, and an Ag/AgCl electrode as reference electrode. The microelectrode chips were fabricated by the Micro Electro-Mechanical System (MEMS) technique. To improve the sensitivity, gold nanoparticles (AuNPs) were electrodeposited on the working electrode. With a linear range from 0.02 to 0.50 mg P/L, the sensitivity of the unmodified microsensor is 2.40 μA per (mg P/L) (R2 = 0.99) and that of the AuNPs-modified microsensor is 7.66 μA per (mg P/L) (R2 = 0.99). The experimental results showed that AuNPs-modified microelectrode had better sensitivity and a larger current response than the unmodified microelectrode.

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“…The sensitivity was found to be −0.657 nA per (µmol L −1 ), which is not particularly high. Bai et al (2014) modified the electrochemical microsensor using microelectromechanical systems (MEMS) technology and AuNPs to improve the sensor performance. The detection limit of the sensor was 1.2 × 10 −7 mol L −1 and the linear range was 3 × 10 −7 to 3 × 10…”

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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Electrochemical microsensor based on gold nanoparticles modified electrode for total phosphorus determinations in water

Cited by 26 publications

References 12 publications

Detection of Glyphosate in Drinking Water: A Fast and Direct Detection Method without Sample Pretreatment

Detection of Glyphosate in Drinking Water: A Fast and Direct Detection Method without Sample Pretreatment

An Electrochemical Microsensor Based on a AuNPs-Modified Microband Array Electrode for Phosphate Determination in Fresh Water Samples

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

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