High-frequency underway analysis of ammonium in coastal waters using an integrated syringe-pump-based environmental-water analyzer (iSEA)

Li, Peicong; Deng, Yao; Shu, Huilin; Lin, Kunning; Chen, Nengwang; Jiang, Yiong; Chen, Jixin; Yuan, Dongxing; Ma, Jian

doi:10.1016/j.talanta.2018.11.108

Cited by 28 publications

(20 citation statements)

References 55 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A manual PMB method and a segmented flow analyzer (AutoAnalyzer3, AA3 method) were used as reference methods for the micromolar-level samples. The description of the online monitoring and underway sampling of surface seawater appears in our previous publications. − …”

Section: Experimental Sectionmentioning

confidence: 99%

“…Recently, we developed a fully automated integrated syringe-pump-based environmental-water analyzer ( i SEA), which uses a syringe pump and multiposition selection valve to overcome the drawbacks of the current batch and continuous flow analyzers . The i SEA is portable and robust, and it has been successfully applied to the underway analysis of ammonium, nitrite, and nitrate in coastal areas. The i SEA has features similar to the very recently developed programmable flow injection techniques, such as using tens of microliters of reagents per assay and a calibration response that is independent of the salinity of the samples, and the system does not use peristaltic pumping .…”

mentioning

confidence: 99%

See 1 more Smart Citation

Automated Determination of Dissolved Reactive Phosphorus at Nanomolar to Micromolar Levels in Natural Waters Using a Portable Flow Analyzer

Deng

Jiang

et al. 2020

Anal. Chem.

Self Cite

View full text Add to dashboard Cite

Automated in-field methods for measuring dissolved reactive phosphorus (DRP) over a large concentration range are in high demand for the purpose of better understanding the biogeochemistry of phosphorus in the river-estuary-coast continuum to the open ocean. Here, an automated portable and robust analyzer was described for the determination of nanomolar to micromolar levels of DRP in natural waters. The quantification of DRP was based on classic phosphomolybdenum blue (PMB) chemistry. All the components of the analyzer were computer-controlled using LabVIEW-based laboratory-programmed software. When equipped with a 3 cm Z-type flow cell, the system demonstrated linearity with concentrations up to 12 μmol L–1, a sampling rate of 20 h–1, a limit of detection of 0.11 μmol L–1, and relative standard deviations (RSDs) of 0.4–4.6% (n = 11–576). When a solid-phase extraction cartridge was combined with the analyzer, the PMB formed from the sample was automatically concentrated on the hydrophilic–lipophilic balanced sorbent. The concentrated PMB compound was eluted with NaOH solution and measured in the spectrophotometric system. Under optimal conditions, the nanomolar-level mode afforded a sampling rate of 8 h–1, a limit of detection of 1.7 nmol L–1, and RSDs of 3.0–5.7% (n = 11–120). The system exhibited advantages that included a wide linear range, high sensitivity and reproducibility, low reagent consumption, and insignificant interference from salinity, silicate, arsenate, and other P-containing compounds. The system was successfully applied for discrete sample analysis, fixed site online monitoring, and the real-time underway measurement of DRP in riverine-estuarine-coastal waters.

show abstract

Section: Experimental Sectionmentioning

confidence: 99%

mentioning

confidence: 99%

Automated Determination of Dissolved Reactive Phosphorus at Nanomolar to Micromolar Levels in Natural Waters Using a Portable Flow Analyzer

Deng

Jiang

et al. 2020

Anal. Chem.

Self Cite

View full text Add to dashboard Cite

show abstract

“…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%

“…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. In the gas-diffusion-based methods, an acid-base indicator (e.g., bromothymol blue, nitrazine yellow) is used, and the color change is measured spectrophotometrically.…”

Section: Introductionmentioning

confidence: 99%

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

Vráblová

Koutník

Smutná

et al. 2021

Sensors

View full text Add to dashboard Cite

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.

show abstract

“…The standard photometric measurement of ammonium and sulfides (DIN ISO 15923-1 (D49) and DIN 38405-D27 (D27)) are off-line measurements that require specific chemical reagents as well as a photometer for measurements. Although efforts have been made to automate the sampling and measurement process [9], the development of a system based on low-cost electrochemical sensors could achieve the following: drastically reduce costs, eliminate the need for chemical reagents, and increase the frequency of measurement.…”

Section: Introductionmentioning

confidence: 99%

Application of Low-Cost Electrochemical Sensors to Aqueous Systems to Allow Automated Determination of NH3 and H2S in Water

Cämmerer

Mayer

Penzel

et al. 2020

Sensors

View full text Add to dashboard Cite

Usage of commercially available electrochemical gas sensors is currently limited by both the working range of the sensor with respect to temperature and humidity and the spikes in sensor response caused by sudden changes in temperature or humidity. Using a thermostatically controlled chamber, the sensor response of ammonia and hydrogen sulfide sensors was studied under extreme, rapidly changing levels of humidity with the aim of analyzing nebulized water samples. To protect the sensors from damage, the gas stream was alternated between a saturated gas stream from a Flow Blurring® nebulizer and a dry air stream. When switching between high and low humidity gas streams, the expected current spike was observed and mathematically described. Using this mathematical model, the signal response due to the change in humidity could be subtracted from the measured signal and the sensor response to the target molecule recorded. As the sensor response is determined by the model while the sensor is acclimatizing to the new humid conditions, a result is calculated faster than that by systems that rely on stable humidity. The use of the proposed mathematical model thus widens the scope of electrochemical gas sensors to include saturated gas streams, for example, from nebulized water samples, and gas streams with variable humidity.

show abstract

High-frequency underway analysis of ammonium in coastal waters using an integrated syringe-pump-based environmental-water analyzer (iSEA)

Cited by 28 publications

References 55 publications

Automated Determination of Dissolved Reactive Phosphorus at Nanomolar to Micromolar Levels in Natural Waters Using a Portable Flow Analyzer

Automated Determination of Dissolved Reactive Phosphorus at Nanomolar to Micromolar Levels in Natural Waters Using a Portable Flow Analyzer

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

Application of Low-Cost Electrochemical Sensors to Aqueous Systems to Allow Automated Determination of NH3 and H2S in Water

Contact Info

Product

Resources

About