Membrane-based microchannel device for continuous quantitative extraction of dissolved free sulfide from water and from oil

Toda, Kei; Ebisu, Yuki; Hirota, Kazutoshi; Ohira, Shin Ichi

doi:10.1016/j.aca.2012.06.036

Cited by 19 publications

(10 citation statements)

References 28 publications

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“…For instance, for the fluorimetric FIA determination of free sulfide from aqueous samples or oil, an effective honeycombpatterned microchannel extraction device was developed with a thin silicone membrane sandwiched between two polymethylsiloxane plates, and detection was based on quenching monitoring of fluorescein mercuric acetate. 184 Likewise, in the design of flow-injection analyzers for determination of ammonia in indoor environments with fluorimetric detection, a membrane-free open channel scrubber was employed 185 (Fig. 2).…”

Section: Recent Developments In Design Of Flow-injection Measuring Sy...mentioning

confidence: 99%

“…In comparison to PMTs and silicon diodes in determination of fluorescein with blue LED used for illumination, it was shown that in the case of PMTs values, one order of magnitude larger of S/N ratio are obtained. 184 In a designed compact flow-through detector with LEDs employed both for excitation and detection of emitted light, in determination of copper with Calcein, it was demonstrated that application of the design with two LEDs irradiating opposite to the sample solution, enhances the emitted signal several times, compared to irradiation with one LED. 261 There was also a design of LED-based flow-through detector with four LEDs reported, which can be employed both for absorptive and fluorimetric detection.…”

Section: Molecular Spectroscopy Detectionsmentioning

confidence: 99%

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Recent advances in flow injection analysis

Trojanowicz

Kołacińska

2016

Analyst

170

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A dynamic development of methodologies of analytical flow injection measurements during four decades since their invention has reinforced the solid position of flow analysis in the arsenal of techniques and instrumentation of contemporary chemical analysis. With the number of published scientific papers exceeding 20,000, and advanced instrumentation available for environmental, food, and pharmaceutical analysis, flow analysis is well established as an extremely vital field of modern flow chemistry, which is developed simultaneously with methods of chemical synthesis carried out under flow conditions. This review work is based on almost 300 original papers published mostly in the last decade, with special emphasis put on presenting novel achievements from the most recent 2-3 years in order to indicate current development trends of this methodology. Besides the evolution of the design of whole measuring systems, and including especially new applications of various detections methods, several aspects of implications of progress in nanotechnology, and miniaturization of measuring systems for application in different field of modern chemical analysis are also discussed.

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Section: Recent Developments In Design Of Flow-injection Measuring Sy...mentioning

confidence: 99%

Section: Molecular Spectroscopy Detectionsmentioning

confidence: 99%

Recent advances in flow injection analysis

Trojanowicz

Kołacińska

2016

Analyst

170

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“…[7][8][9] A flow-based analysis system with a gas diffusion unit has been reported for separation of the gas-convertible compounds from the sample matrices. 10,11 Flow injection analysis systems coupled with gas diffusion unit (GDU) have been reported for sulfide ion determination by using various detection techniques, such as triangle program coulometric titration, 12 absorption spectrometry via methylene blue method, [4][5][6]13 potentiometry, 14,15 amperometry, 16 flame photometry 17 and fluorometry via quenching of the fluorescein mercuric acetate (FMA), 18 However, for some turbid samples, a filtering step has been required before introducing the analyte to the flow analysis system.…”

Section: Introductionmentioning

confidence: 99%

“…Although a highly sensitive signal can be obtained, the systems required an expensive photomultiplier tube. Although the sulfide detection with LED-photodiode based fluorescence based on the quenching of FMA provided a sensitive measurement and simple flow analysis, 18 the highly toxic reagent of FMA is a drawback. The LED and photodiode colorimeter were adapted for in-situ measurement at 535 nm on a gas-permeable porous tube as an optical system for sulfide ion determination in human serum by using nitroprusside chemistry.…”

Section: Introductionmentioning

confidence: 99%

Colorimetric Determination of Sulfide in Turbid Water with a Cost-effective Flow-batch Porous Membrane-based Diffusion Scrubber System

et al. 2020

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A cost-effective flow-batch analysis approach with colorimetric measurement has been developed for sulfide ion determination in turbid water samples without using a conventional pump and valve. Under an acidic condition, sulfide ion was converted to hydrogen sulfide gas and liberated out from other complicated matrices. The porous membranebased diffusion scrubber was utilized as a gas trapping unit for hydrogen sulfide gas separation/preconcentration. From the correlation of sulfide ion concentration and disappearance of sodium nitroprusside reagent detection by using a homemade LED-photodiode based colorimetry, a linear relationship of sulfide ion concentration and absorbance can be obtained with relative standard deviation (%RSD) less than 5%. The limit of detection was 5.6 μmol L-1. The proposed system was applied for sulfide ion determination in wastewater samples with the recoveries of 91.0-105.2%. The proposed system is a robust setup and able to handle turbid water samples without a sample filtering step.

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“…In recent years, droplet‐based microfluidic technology has received growing research interests and rapid development. Microdroplet, as an individual reactor at the micrometer scale, has been employed in various areas, such as DNA hybridization analysis, cell activation, enzyme reaction, chemical analysis, and biotechnology . Rapid mixing is crucial for realizing the function of microfluidic devices.…”

Section: Introductionmentioning

confidence: 99%

Fluid mixing in droplet‐based microfluidics with T junction and convergent–divergent sinusoidal microchannels

Yang

Liu

et al. 2018

Electrophoresis

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To explore and utilize the advantages of droplet-based microfluidics, hydrodynamics, and mixing process within droplets traveling though the T junction channel and convergent-divergent sinusoidal microchannels are studied by numerical simulations and experiments, respectively. In the T junction channel, the mixing efficiency is significantly influenced by the twirling effect, which controls the initial distributions of the mixture during the droplet formation stage. Therefore, the internal recirculating flow can create a convection mechanism, thus improving mixing. The twirling effect is noticeably influenced by the velocity of the continuous phase; in the sinusoidal channel, the Dean vortices and droplet deformation are induced by centrifugal force and alternative velocity gradient, thus enhancing the mixing efficiency. The best mixing occurred when the droplet size is comparable with the channel width. Finally, we propose a unique optimized structure, which includes a T junction inlet joined to a sinusoidal channel. In this structure, the mixing of fluids in the droplets follows two routes: One is the twirling effect and symmetric recirculation flow in the straight channel. The other is the asymmetric recirculation and droplet deformation in the winding and variable cross-section. Among the three structures, the optimized structure has the best mixing efficiency at the shortest mixing time (0.25 ms). The combination of the twirling effect, variable cross-section effect, and Dean vortices greatly intensifies the chaotic flow. This study provides the insight of the mixing process and may benefit the design and operations of droplet-based microfluidics.

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Membrane-based microchannel device for continuous quantitative extraction of dissolved free sulfide from water and from oil

Cited by 19 publications

References 28 publications

Recent advances in flow injection analysis

Recent advances in flow injection analysis

Colorimetric Determination of Sulfide in Turbid Water with a Cost-effective Flow-batch Porous Membrane-based Diffusion Scrubber System

Fluid mixing in droplet‐based microfluidics with T junction and convergent–divergent sinusoidal microchannels

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