Voltammetric detection of nitrate in water sample based on in situ copper-modified electrode

Luo, Xue; Wu, Jian

doi:10.1007/s11581-012-0839-0

Cited by 11 publications

(8 citation statements)

References 33 publications

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“…However, the methods are time-consuming, and more importantly, they use chemical reagents that cause secondary pollution. With the development of analytical instruments and technology, other measurement methods have emerged, including electrochemical methods (Luo, Wu, & Ying, 2013), ion chromatography (Tirumalesh, 2008), ultraviolet spectroscopy (Siddiqui, Wabaidur, Alothman, & Rafiquee, 2015), and high-performance liquid chromatography (Akyuz & Ata, 2009;Khan, Wabaidur, Alothman, Busquets, & Naushad, 2016). However, these methods are complicated and slow, and require sampling and pretreatment.…”

Section: Introductionmentioning

confidence: 99%

Rapid determination of nitrate in drinking water using ion‐exchange‐enhanced infrared spectroscopy

Dong

2019

J Food Process Engineering

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Infrared spectroscopy is an effective method for the determination of compositions and concentrations of liquids, with advantages of fast response, no‐sampling, flexible in use, and is effective for on‐line monitoring. However, for trace substances in drinking water, such as nitrates and heavy metals, infrared spectroscopy is not sensitive enough for the quantitative and qualitative measurement. In this study, we improved the sensitivity of infrared spectroscopy for nitrite determination by developing an ion‐exchange‐enhanced diffuse reflectance spectroscopy, which consists of an accessory based on ion‐exchange resin for enrichment and a Fourier transform infrared spectrometer for measurement. Using this method, the limit of detection for nitrate is 1.7 mg/L, which is enough for drinking water sensing. We also verified the quantitative measurement ability of the method. Furthermore, the limit of detection and quantitative measuring range could be adjusted by changing the mass of resin and adsorption time. This study demonstrated that the method is effective to detect trace nitrites in drinking water, can be applied in the field, and is sensitive, rapid, and inexpensive with a wide dynamic range. Practical applications This study demonstrated an ion‐exchange‐enhanced diffuse reflectance spectroscopy, which is effective to quantitatively measure nitrate in drinking water with concentrations within several ppm. Compared with traditional used methods for water nitrate analysis, our method is rapid, sensitive, and inexpensive and is potential for on‐line measurement. The method can be used in drinking water sensing and water processing. By changing the ion‐exchange resin, it is also effective to measure other compositions in water rather than nitrate. It can also be used to determine harmful compositions in drinks. Meanwhile, we developed a smart sensor based on this method, which used an Microelectro Mechanical Systems Fourier transform infrared spectrometer instead of V70 in this study. It is now in the test for the rapid determination of nitrate in drinking water by Water Services Company of Beijing.

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Section: Introductionmentioning

confidence: 99%

Rapid determination of nitrate in drinking water using ion‐exchange‐enhanced infrared spectroscopy

Dong

2019

J Food Process Engineering

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“…Metals with nanostructures, such as metal nanoparticles (MNPs), metal nanowires, nanoporous metals, and dendritic metals, are thus used to modify the electrodes to enhance their sensitivity and durability. Among the various metal materials, copper (Cu) and silver (Ag) show higher activity. By analyzing the literature in detail, it can be found that Cu shows better activity toward the reduction of both nitrate and nitrite but Ag exhibits superiority in nitrite oxidation .…”

Section: Introductionmentioning

confidence: 99%

“…Graphene has also been used to improve sensitivity, and a stabilizing reagent such as a dendrimer is used to stabilize the extremely active MNPs . To resolve the problem of deactivation of Cu during the reduction of nitrate, some in situ techniques of electrode modification have been developed …”

Section: Introductionmentioning

confidence: 99%

CuAg nanoparticles formed in situ on electrochemically pre‐anodized screen‐printed carbon electrodes for the detection of nitrate and nitrite anions

Sun

Chen

2018

J Chinese Chemical Soc

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CuAg nanoparticles (CuAgNPs) were electrochemically formed in situ on preanodized, screen-printed carbon electrodes (SPCEs) that possessed many oxygencontaining functional groups capable of adsorbing metal ions, namely Cu 2+ and Ag + . Pre-anodization was achieved using continuous cyclic voltammetry in the range of potential 0.3-2.0 V under a scan rate of 50 mV/s. Cu 2+ and Ag + ions were adsorbed on the pre-anodized SPCE by immersing the electrode in solutions containing both metal ions, and then CuAgNPs were formed in situ via electrochemical reduction in a deaerated, neat NaClO 4 solution after the electrode was ultrasonicated to remove physically adsorbed metal ions. Although CuNPs showed higher activity than AgNPs toward both nitrate (NO 3 − ) and nitrite (NO 2 − ) ions, the instability of CuNPs hindered the application, so CuAgNPs were employed to achieve a compromise between sensitivity and stability. The SPCE/anodized/ CuAgNP electrodes showed activity toward the electrochemical reduction of NO 3 − and NO 2 − , respectively, with the limit of detection (LOD) of 15.6 μM (0.97 ppm) and 11.

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“…However, the methods are time consuming and they use chemical reagents that cause secondary pollution. With the development of analytical instruments and technology, other measurement methods have emerged, including electrochemical methods [10]，ion chromatography [11], ultraviolet spectroscopy [12], and high-performance liquid chromatography [13,14]. However, these methods are complicated and slow, and require sampling and sample pretreatment.…”

Section: Introductionmentioning

confidence: 99%

Rapid Determination of Nitrite in Drinking Water Using Ion-Exchange-Enhanced Infrared Spectroscopy

Du¹,

Ye²,

Dong³

2018

Preprint

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Infrared spectroscopy is an effective method for the determination of compositions and concentrations of liquids, with advantages of fast response, no-sampling, flexible in use and is able for on-line monitoring. However, for trace substances in drinking water, such as nitrates and heavy metals, infrared spectroscopy is not sensitive enough for the quantitative and qualitative measurement. In this study, we improved the sensitivity of infrared spectroscopy for nitrite determination by developing an ion-exchange-enhanced diffuse reflectance spectroscopy, which consist of an accessory based on ion-exchange resin for enrichment and a FTIR spectrometer for measurement. Using this method, the limit of detection for nitrate is 1.7 mg/L, which is enough for drinking water sensing. We also verified the quantitative measurement ability of the method. Furthermore, the limit of detection and quantitative measuring range could be adjusted by changing the mass of resin and adsorption time. This study demonstrated the method can be used to detect trace nitrites in drinking water, can be applied in the field, and is sensitive, rapid, and inexpensive with a wide dynamic range.

show abstract

Voltammetric detection of nitrate in water sample based on in situ copper-modified electrode

Cited by 11 publications

References 33 publications

Rapid determination of nitrate in drinking water using ion‐exchange‐enhanced infrared spectroscopy

Rapid determination of nitrate in drinking water using ion‐exchange‐enhanced infrared spectroscopy

CuAg nanoparticles formed in situ on electrochemically pre‐anodized screen‐printed carbon electrodes for the detection of nitrate and nitrite anions

Rapid Determination of Nitrite in Drinking Water Using Ion-Exchange-Enhanced Infrared Spectroscopy

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