A coastal surface seawater analyzer for nitrogenous nutrient mapping

Masserini, Robert T.; Fanning, Kent A.; Hendrix, Steven A.; Kleiman, Brittany M.

doi:10.1016/j.csr.2017.09.010

Cited by 9 publications

(4 citation statements)

References 18 publications

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“…This variation indicated the complexity of sources and biogeochemical behaviors of nutrients in coastal areas. 8,19,51,52 As shown in Figure 7B, from the upper zone to the lower zone of JRE, the N/P ratio decreased from 64.7 to 22.6. In Xiamen Bay, the N/P ratio decreased with an increase in the distance from the estuary.…”

Section: ■ Results and Discussionmentioning

confidence: 86%

“…Except for the site near the JRE where the proportion of nitrite was greater than that of ammonium, the proportion of ammonium in Xiamen Bay was similar to that of nitrite. This variation indicated the complexity of sources and biogeochemical behaviors of nutrients in coastal areas. ,,, …”

Section: Resultsmentioning

confidence: 95%

“…and system requirements (high reliability, low consumption, high frequency, etc. ). − Major advances in the development of devices utilizing different flow techniques (e.g., segmented continuous-flow analysis, , normal flow injection analysis, − reverse flow injection analysis, , sequential injection analysis, , microfluidic chips, − flow batch analysis, − programmable flow injection (pFI) in batch mode , ) to measure nutrients in seawater have been reported. Some of them have been applied for the underway measurement of specific single or dual-parameter nutrients in shipboard laboratories. ,− However, to the best of our knowledge, studies on the simultaneous underway analysis of all five key nutrients in estuarine and coastal waters are not available.…”

Section: Introductionmentioning

confidence: 99%

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Real-Time Underway Mapping of Nutrient Concentrations of Surface Seawater Using an Autonomous Flow Analyzer

Zhang

2022

Anal. Chem.

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High-frequency field nutrient analyzers offer a promising technology to solve time-consuming and laborious sampling problems in dynamic and complex river−estuarine− coastal ecosystems. However, few studies on the simultaneous underway analysis of five key nutrients (ammonium, nitrite, nitrate, phosphate, and silicate) in seawaters are available because of the limitations of the technique. In this study, a state-of-the-art autonomous portable analyzer for the shipboard analysis of nutrients in the environment of varied salinities and concentration ranges was reported. The analyzer consisted of compact hardware that was well suited for shipboard deployment with minimal maintenance. Moreover, a novel LabVIEW-based software program was developed, containing additional functions such as automated calibration curve generation, autodilution of high-concentration samples, and a user-friendly interface for multiparameter analysis using a single instrument. After the optimization of chemical reactions and work flow chart, the analyzer exhibited low limits of detection, a large linear range with automated dilution, and relative standard deviations of less than 2% (n = 11). Compared to other flow-based techniques, this analyzer is more portable and consumes less reagent with an autonomous data processing function and applicability within a broad salinity range (0−35). The analyzer was successfully applied for real-time analysis in the Jiulong River Estuary−Xiamen Bay with excellent on-site accuracy and applicability. The relationship between high spatial resolution nutrient concentrations and salinities showed very different patterns in estuarine and coastal areas, indicating the benefit of using an underway automated analyzer for chemical mapping in a dynamic environment.

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Section: ■ Results and Discussionmentioning

confidence: 86%

Section: Resultsmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

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Real-Time Underway Mapping of Nutrient Concentrations of Surface Seawater Using an Autonomous Flow Analyzer

Zhang

2022

Anal. Chem.

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“…Foi constatada uma grande heterogeneidade no que diz respeito à abrangência das diferentes implementações, existindo algumas caracterizadas por uma alta flexibilidade e/ou por uma grande quantidade de parâmetros monitoráveis (MARCELLI et al, 2014;MASSERINI JR. et al, 2017;MCKEE;HAM;JONES, 1997;NG;SENFT-GRUPP;HEMOND, 2012;PUIU et al, 2015), enquanto outras, demonstraram considerável simplicidade, mantendo seu foco em alguns poucos parâmetros específicos, obtendo, por conseguinte, uma expressiva redução de custo (BARDAJI et al, 2016;LEEUW;BOSS;WRIGHT, 2013;LOCKRIDGE et al, 2016). A existência dessas diferentes categorias de implementação dificulta a comparação entre o custo das mesmas.…”

Section: Aspectos Financeirosunclassified

Estudo Bibliográfico Sobre Metodologias Empregadas Para a Estimativa De Fitoplâncton Em Ambientes Naturais

Miranda¹,

Garcez²,

Oliveira³

et al. 2022

Rev. Foco

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A determinação da concentração de fitoplancton é um requisito básico para a compreensão dos processos de produção primária em sistemas aquáticos, sendo sua determinação in situ, uma metodologia eficiente para a obtenção ágil de resultados e para o monitoramento contínuo e automatizado. O presente estudo tem como objetivo identificar os aspectos mais relevantes sobre medição in situ do fitoplâncton, focando em sua acessibilidade e custo de implementação, assim como, identificar um conjunto de publicações formando um núcleo literário de partida para o estudo de aprofundamento das metodologias de determinação da concentração de fitoplâncton em ambientes aquáticos. A metodologia fundamentou-se na busca em bases de publicações literárias, seleção dos artigos pertinentes, seguida da extração e síntese dos dados. Os resultados convergiram para uma seleção de documentos seguida de uma revisão sistemática. Ao final, pôde-se concluir que o tema se mantem relevante e que as propostas apresentadas pela literatura demonstram-se consideravelmente heterogêneas no que diz respeito à flexibilidade, à quantidade de parâmetros monitoráveis e, consequentemente, ao custo de implementção. Concluiu-se também que, nas propostas economicamente mais acessíveis, houve a predominância da utilização dos microcontroladores da família Arduino, das fontes de excitação luminosa baseada em LED e de sensores de intensidade luminosa, substituindo os fluorímetros comerciais.

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Simultaneous underway analysis of nitrate and nitrite in estuarine and coastal waters using an automated integrated syringe-pump-based environmental-water analyzer

Fang

Lin

et al. 2019

Analytica Chimica Acta

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A coastal surface seawater analyzer for nitrogenous nutrient mapping

Cited by 9 publications

References 18 publications

Real-Time Underway Mapping of Nutrient Concentrations of Surface Seawater Using an Autonomous Flow Analyzer

Real-Time Underway Mapping of Nutrient Concentrations of Surface Seawater Using an Autonomous Flow Analyzer

Estudo Bibliográfico Sobre Metodologias Empregadas Para a Estimativa De Fitoplâncton Em Ambientes Naturais

Simultaneous underway analysis of nitrate and nitrite in estuarine and coastal waters using an automated integrated syringe-pump-based environmental-water analyzer

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