Modification of Graphene on Ultramicroelectrode Array and Its Application in Detection of Dissolved Oxygen

Wang, Jinfen; Bian, Chao; Tong, Jianhua; Sun, Jizhou; Yang, Li; Wang, Hong; Xia, Shanhong

doi:10.3390/s150100382

Cited by 10 publications

(5 citation statements)

References 32 publications

(46 reference statements)

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“…In actual production and application, the change in the dissolved oxygen concentration is a continuous and dynamic process; thus, a high-accuracy real-time dissolved oxygen detection method is essential. Although many experts want to improve the abovementioned traditional dissolved oxygen detection technology by relying on material science, it is difficult to break through on the whole [20]. An intelligent dissolved oxygen sensor can perform analog and digital signal processing on the collected dissolved oxygen signals, realize intelligent transmission, and achieve a “plug and play” effect.…”

Section: Introductionmentioning

confidence: 99%

Review of Dissolved Oxygen Detection Technology: From Laboratory Analysis to Online Intelligent Detection

Wei

Jiao

et al. 2019

Sensors

127

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Dissolved oxygen is an important index to evaluate water quality, and its concentration is of great significance in industrial production, environmental monitoring, aquaculture, food production, and other fields. As its change is a continuous dynamic process, the dissolved oxygen concentration needs to be accurately measured in real time. In this paper, the principles, main applications, advantages, and disadvantages of iodometric titration, electrochemical detection, and optical detection, which are commonly used dissolved oxygen detection methods, are systematically analyzed and summarized. The detection mechanisms and materials of electrochemical and optical detection methods are examined and reviewed. Because external environmental factors readily cause interferences in dissolved oxygen detection, the traditional detection methods cannot adequately meet the accuracy, real-time, stability, and other measurement requirements; thus, it is urgent to use intelligent methods to make up for these deficiencies. This paper studies the application of intelligent technology in intelligent signal transfer processing, digital signal processing, and the real-time dynamic adaptive compensation and correction of dissolved oxygen sensors. The combined application of optical detection technology, new fluorescence-sensitive materials, and intelligent technology is the focus of future research on dissolved oxygen sensors.

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Section: Introductionmentioning

confidence: 99%

Review of Dissolved Oxygen Detection Technology: From Laboratory Analysis to Online Intelligent Detection

Wei

Jiao

et al. 2019

Sensors

127

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“…It can almost be used to measure dissolved oxygen in most industrial wastewater and domestic sewage. However, during fluorescence spectroscopy measurements, there is a loss of fluorescence agents, which can bias the measurements, and therefore it is necessary to replenish the amount of fluorescence agents in time [7][8] .The oxygen electrode method is an electrochemical test to determine the amount of dissolved oxygen in water based on the diffusion rate of molecular oxygen through a membrane. Through the diffusion of oxygen in the gas to the electrolyte immediately occurs reduction reaction on the cathode, oxidation reaction on the anode, the current generated by the reaction is proportional to the concentration of oxygen, by measuring the size of the current in the electrode can be calculated the concentration of dissolved oxygen.…”

Section: Introductionmentioning

confidence: 99%

Design and implementation of verification device for dissolved oxygen tester

Li,

Zhao,

Yuan

et al. 2023

Sixth International Conference on Computer Information Science and Application Technology (CISAT 2023)

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Due to the low validation efficiency and large human error of the dissolved oxygen tester, a new calibration device was developed for the dissolved oxygen validation, which has the functions of accurately controlling the experimental temperature, accurately measuring the atmospheric pressure, and automatically calculating the standard value of dissolved oxygen. The temperature and concentration homogeneity of the liquid to be probed are two important parameters that affect the validation results. In this paper, we use the Fluent simulation software to model and simulate the uniform distribution of temperature and dissolved oxygen concentration in a validation tank. When the temperature of the verification device is set at 10°C, 20°C and 30°C respectively, each 10 mm is selected as a measurement plane in the range of 10 mm to 80 mm of the detection depth, and five test points are selected on each measurement plane to carry out simulation tests. The experimental results show that the concentration of dissolved oxygen is less than 0.27% uniform within the same measurement plane and less than 0.39% uniform between different measurement planes. To verify the validation effectiveness of the proposed device, three dissolved oxygen testers from different manufacturers were selected for the validation work. The error of temperature indication value of the three instruments is not more than ±0.1 °C, the measurement repeatability is not more than 0.02 mg/L, and the error of dissolved oxygen concentration indication value is not more than ±0.08 mg/L, which all meet the requirements of verification regulations. The results show that the proposed device can be effectively applied for the validation of dissolved oxygen meters.

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“…The use of a few microns-sized electrodes makes it possible, due to purely diffusionbased processes, to achieve a stationary CV response without special hydrodynamic conditions [1][2][3][4][5][6][7][8][9][10][11]. This is achieved due to the presence of the contribution of the radial components of diffusion, when, as the distance from the geometric center of the electrode increases, the volume of the layer of equal thickness (and, hence, the amount of the substance per this layer) increases.…”

Section: Introductionmentioning

confidence: 99%

Prospects of Application of Ultramicroelectrode Ensembles for Voltammetric Determination of Compounds with Close Standard Electrode Potentials and Different Diffusion Coefficients

et al. 2022

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The spherical diffusion that occurs when using ultramicroelectrodes (i.e., electrodes with a characteristic size of 1–10 µm) contributes to a higher mass transfer rate. This leads to equalization of the depletion rates of the near-electrode layer due to the electrochemical reaction and to the supply of the product from the solution depth. This is the reason why, for ultramicroelectrodes, a limiting size of the spherical layer exists in which the concentration gradient is localized (diffusion layer). Thus, a stationary mass transfer mode is achieved, which is expressed in the sigmoidal CV curve’s shape. In ultramicroelectrode arrays, when the diffusion hemispheres are separated, a steady-state diffusion is realized. However, with a decrease in the interelectrode distance, which leads to the diffusion spheres intersection, a mixed regime arises, which is not fully time-independent. The resulting voltammogram’s shape change can serve as an analytical signal in the study of substances with differing diffusion coefficients, since the diffusion layer growth rate and, consequently, the area of intersection of neighboring spheres, depends on it. This work shows the applicability of voltammetry using ensembles of ultramicroelectrodes operating in the transient mode for the analysis of mixtures of electrochemically active compounds with close electrode reaction parameters, such as exchange currents and electrode potential. Ferrocenemethanol esters are used as an example. The applicability of cyclic voltammetry on the UME array for analysis of mixtures was illustrated by means of finite element modelling. The reliability of the modelling results was experimentally proved for ferrocenemethanol esters with glycine and triglycine.

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Modification of Graphene on Ultramicroelectrode Array and Its Application in Detection of Dissolved Oxygen

Cited by 10 publications

References 32 publications

Review of Dissolved Oxygen Detection Technology: From Laboratory Analysis to Online Intelligent Detection

Review of Dissolved Oxygen Detection Technology: From Laboratory Analysis to Online Intelligent Detection

Design and implementation of verification device for dissolved oxygen tester

Prospects of Application of Ultramicroelectrode Ensembles for Voltammetric Determination of Compounds with Close Standard Electrode Potentials and Different Diffusion Coefficients

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