Optimization of a salinity-interference-free indophenol method for the determination of ammonium in natural waters using o-phenylphenol

Ma, Jian; Li, Peicong; Lin, Kunning; Chen, Zhaoying; Chen, Nengwang; Liao, Kewei; Yuan, Dongxing

doi:10.1016/j.talanta.2017.11.069

Cited by 37 publications

(20 citation statements)

References 34 publications

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“…Therefore, the effects of sample temperature on the reaction were evaluated using a sample bottle immersed in a water bath with various temperatures ranging from 4 to 70 °C. As seen in Figure S3, higher temperature can accelerate the rate of reaction and shorten the analysis time, which is in accordance of our previous study . Temperature effects vary for different reaction times (inset of Figure S3).…”

Section: Resultssupporting

confidence: 90%

“…The mechanism of the Berthelot reaction is very complicated, and thus reagent compositions and aspiration order of the reagents and sample into the syringe are key factors for the formation of the chemical product . Using our previous comprehensive study on indophenol chemistry, , the effects of different reagents on reaction kinetics were evaluated, and the detailed description and results are shown in the SI. The optimized values are tabulated in Table .…”

Section: Resultsmentioning

confidence: 99%

“…As seen in Figure S3, higher temperature can accelerate the rate of reaction and shorten the analysis time, which is in accordance of our previous study. 28 Temperature effects vary for different reaction times (inset of Figure S3). At the current analytical frequency (5 min/sample), temperature effects were not significant when sample temper-ature was >20 °C.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…This analyzer takes advantage of using a syringe pump to overcome drawbacks of current batch and continuous flow analyzers. The chemistry is based on a modified IPB method using o -phenylphenol (OPP) instead of toxic and odorous phenol, which is also more suitable for saline sample analysis compared with salicylate color reagent assays. − The novelty and applicability of i SEA was demonstrated in the application of fully automated real-time determination of ammonium in fresh water for 14 days. These high-resolution field measurements can potentially lead to significant advances in understanding nutrient biogeochemical cycles and complex dynamics of nitrification.…”

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confidence: 99%

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Development of an Integrated Syringe-Pump-Based Environmental-Water Analyzer (iSEA) and Application of It for Fully Automated Real-Time Determination of Ammonium in Fresh Water

Chen

et al. 2018

Anal. Chem.

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The development of a multipurpose integrated syringe-pump-based environmental-water analyzer ( iSEA) and its application for spectrophotometric determination of ammonium is presented. The iSEA consists of a mini-syringe pump equipped with a selection valve and laboratory-programmed software written by LabVIEW. The chemistry is based on a modified indophenol method using o-phenylphenol. The effect of reagent concentrations and sample temperatures was evaluated. This fully automated analyzer had a detection limit of 0.12 μM with sample throughput of 12 h. Relative standard deviations at different concentrations (0-20 μM) were 0.23-3.36% ( n = 3-11) and 1.0% ( n = 144, in 24 h of continuous measurement, ∼5 μM). Calibration curves were linear ( R = 0.9998) over the range of 0-20 and 0-70 μM for the detection at 700 and 600 nm, respectively. The iSEA was applied in continuous real-time monitoring of ammonium variations in a river for 24 h and 14 days. A total of 1802 samples were measured, and only 0.4% was outlier data (≥3 sigma residuals). Measurements of reference materials and different aqueous samples ( n = 26) showed no significant difference between results obtained by reference and present methods. The system is compact (18 cm × 22 cm × 24 cm), portable (4.8 kg), and robust (high-resolution real-time monitoring in harsh environments) and consumes a small amount of chemicals (20-30 μL/run) and sample/standards (2.9 mL/run).

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Section: Resultssupporting

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

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Development of an Integrated Syringe-Pump-Based Environmental-Water Analyzer (iSEA) and Application of It for Fully Automated Real-Time Determination of Ammonium in Fresh Water

Chen

et al. 2018

Anal. Chem.

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“…In the determination of ammonium, the indophenol blue (IPB) method based on the classic Berthelot reaction is the most widely used spectrophotometric method [17]. Recently, a modified IPB method, replacing toxic and odorous phenol with o-phenylphenol (OPP), was reported [18][19][20][21]. The analyzer developed by Li et al [19] was used for the online monitoring of ammonium.…”

Section: Introductionmentioning

confidence: 99%

Combined SPRi Sensor for Simultaneous Detection of Nitrate and Ammonium in Wastewater

Vráblová

Koutník

Smutná

et al. 2021

Sensors

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Water pollution is a serious problem in modern society. Agriculture, being responsible for the discharge of agrochemicals, organic matter, or drug residues, produces a huge amount of wastewater. Aquaponics has the potential to reduce both water consumption and the impact of water pollution on fish farming and plant production. In the aquatic environment, inorganic nitrogen is mostly present in the form of nitrate and ammonium ions. Nitrate, as a final product of ammonia mineralization, is the most common chemical contaminant in aquifers around the world. For continuous monitoring of nitrogen compounds in wastewater, we propose a sensor for the simultaneous detection of nitrate and ammonium. A surface plasmon resonance imaging method with enzyme-mediated detection was used. Active layers of nitrate reductase and glutamine synthetase were created on the gold surface of a biochip and tested for the sensing of nitrate and ammonium in water from an aquaponic system. The proposed sensor was applied in water samples with a concentration of NO3− and NH4+ in a range between 24–780 mg·L−1 and 0.26–120 mg·L−1, respectively, with minimal pretreatment of a sample by its dilution with a buffer prior to contact on a biochip surface.

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Unveiling Cutting‐Edge Developments in Electrocatalytic Nitrate‐to‐Ammonia Conversion

Zhang,

Wang,

Cao

et al. 2024

Advanced Materials

108

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The excessive enrichment of nitrate in the environment can be converted into ammonia (NH3) through electrochemical processes, offering significant implications for modern agriculture and the potential to reduce the burden of the Haber‐Bosch (HB) process while achieving environmentally‐friendly NH3 production. Emerging research on electrocatalytic nitrate reduction (eNitRR) to NH3 has gained considerable momentum in recent years for efficient NH3 synthesis. However, existing reviews on nitrate reduction have primarily focused on limited aspects, often lacking a comprehensive summary of catalysts, reaction systems, reaction mechanisms, and detection methods employed in nitrate reduction. This review aims to provide a timely and comprehensive analysis of the eNitRR field by integrating existing research progress and identifying current challenges. This review offers a comprehensive overview of the research progress achieved using various materials in electrochemical nitrate reduction, elucidates the underlying theoretical mechanism behind eNitRR, and discusses effective strategies based on numerous case studies to enhance the electrochemical reduction from NO3˗ to NH3. Finally, this review discusses challenges and development prospects in the eNitRR field with an aim to guide design and development of large‐scale sustainable nitrate reduction electrocatalysts.This article is protected by copyright. All rights reserved

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Optimization of a salinity-interference-free indophenol method for the determination of ammonium in natural waters using o-phenylphenol

Cited by 37 publications

References 34 publications

Development of an Integrated Syringe-Pump-Based Environmental-Water Analyzer (iSEA) and Application of It for Fully Automated Real-Time Determination of Ammonium in Fresh Water

Development of an Integrated Syringe-Pump-Based Environmental-Water Analyzer (iSEA) and Application of It for Fully Automated Real-Time Determination of Ammonium in Fresh Water

Combined SPRi Sensor for Simultaneous Detection of Nitrate and Ammonium in Wastewater

Unveiling Cutting‐Edge Developments in Electrocatalytic Nitrate‐to‐Ammonia Conversion

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