Reconstruction of corrupted datasets from ammonium-ISE sensors at WRRFs through merging with daily composite samples

Pedersen, Jonas Wied; Larsen, Laura Holm; Thirsing, Carsten; Vezzaro, Luca

doi:10.1016/j.watres.2020.116227

Cited by 3 publications

(2 citation statements)

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“…Potentiometry is a standard technique used in analytical laboratories around the world, and ion-selective electrodes for more than 50 different ions are commercially available. Among these sensors, ammonium ion-selective electrodes (NH 4 -ISEs) have proven to be an indispensable sensing tool in three different fields: (i) environmental water analysis [2,3], (ii) in the food industry for the detection of food freshness [4] and (iii) monitoring ammonium concentration in biologically important fluids for clinical diagnostics as well as for the purposes of sports practice [5].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of an All-Solid-State Ammonium Paper Electrode Using a Graphite-Polyvinyl Butyral Transducer Layer

et al. 2021

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A planar solid-state ammonium-selective electrode, employing a composite mediator layer of graphite particles embedded in a polyvinyl butyral matrix on top of an inkjet-printed silver electrode, is presented in this paper. The effect of graphite powder mass fraction on the magnitude of the potentiometric response of the sensor was systematically verified using a batch-mode and a flow injection measurement setup. Under steady-state conditions, the paper electrode provided a Nernstian response of 57.30 mV/pNH4 over the concentration range of 10−5 M to 10−1 M with a detection limit of 4.8 × 10−6 M, while the analytical performance of the array in flow mode showed a narrower linear range (10−4 M to 10−1 M; 60.91 mV/pNH4 slope) with a LOD value of 5.6 × 10−5 M. The experimental results indicate that the prepared electrode exhibited high stability and fast response to different molar concentrations of ammonium chloride solutions. The pH-response of the paper NH4-ISE was also investigated, and the sensor remained stable in the pH range of 2.5–8.5. The potentiometric sensor presented here is simple, lightweight and inexpensive, with a potential application for in-situ analysis of environmental water samples.

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Section: Introductionmentioning

confidence: 99%

Fabrication of an All-Solid-State Ammonium Paper Electrode Using a Graphite-Polyvinyl Butyral Transducer Layer

et al. 2021

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“…However, the majority of studies on soft sensing in combined sewer systems are focused on water quality, e.g. (Pedersen et al, 2020). Chandola et al (2009) define "anomaly detection" as the problem of finding patterns in data that do not conform to expected behavior.…”

Section: Soft Sensing and Anomaly Detection 21 Terminologymentioning

confidence: 99%

From soft sensing to anomaly detection in combined sewer systems

Palmitessa

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Spectrophotometric-Based Sensor for the Detection of Multiple Fertilizer Solutions

Li,

Wu,

Liang

et al. 2024

Agriculture

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The online detection of fertilizer solution information is a crucial link in the implementation of intelligent and precise variable fertilization techniques. However, achieving simultaneous rapid online detection of multiple fertilizer components is still challenging. Therefore, a rapid detection method based on spectrophotometry for qualitative and quantitative identification of four fertilizers (typical N, P, and K fertilizers: KNO3, (NH4)2SO4, KH2PO4, and K2SO4) was proposed in this work. Full-scan absorption spectra of fertilizer solutions at varying concentrations were obtained using a UV–visible/near-infrared spectrophotometer. By assessing the linear fit between fertilizer concentration and absorbance at each wavelength within the characteristic band, the characteristic wavelengths for KNO3, (NH4)2SO4, KH2PO4, and K2SO4 were identified as 214 nm, 410 nm, 712 nm, and 1708 nm, respectively. The identification method of fertilizer type and the prediction model of concentration were constructed based on characteristic wavelength and the Lambert–Beer law. Based on the above analysis, a four-channel photoelectric sensor was designed with four LEDs emitting wavelengths closely matched to characteristic wavelengths for fertilizer detection. A detection strategy of “qualitative analysis followed by quantitative detection” was proposed to realize the online detection of four fertilizer types and their concentrations. Evaluation of the sensor’s performance showed its high stability, with an accuracy of 81.5% in recognizing fertilizer types. Furthermore, the relative error of the sensor detection was substantially less than ±15% for the fertilizer concentrations not exceeding 80 mg/L. These results confirm the capability of the sensor to meet the practical requirements for online detection of four fertilizer types and concentrations in the field of agricultural engineering.

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Reconstruction of corrupted datasets from ammonium-ISE sensors at WRRFs through merging with daily composite samples

Cited by 3 publications

References 33 publications

Fabrication of an All-Solid-State Ammonium Paper Electrode Using a Graphite-Polyvinyl Butyral Transducer Layer

Fabrication of an All-Solid-State Ammonium Paper Electrode Using a Graphite-Polyvinyl Butyral Transducer Layer

From soft sensing to anomaly detection in combined sewer systems

Spectrophotometric-Based Sensor for the Detection of Multiple Fertilizer Solutions

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