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Москвин, Л. Н.; Михайлова, Н.В.; Москвин, А. Л.

doi:10.1023/a:1016797913675

Cited by 5 publications

(6 citation statements)

References 2 publications

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“…To prepare the H 2 S standard gas mixtures, 3, 30, 60, 90 and 120 mg/l of working solutions were used. 0.5 ml of working solution S 2ions and 0.5 ml of 0.2 M H 2 SO 4 solution were placed into a glass bubbler (8) and nitrogen (9) was passed through with the flow rate of 0.3 l/min (Fig . 1).…”

Section: Generation Of the H 2 S Standard Gas Mixturesmentioning

confidence: 99%

“…To record maximum absorbance -plateau level, for different concentration of H 2 S, 0.5 ml of each working solution was mixed with 0.5 ml of 0.2 M H 2 SO 4 solution in the glass bubbler (8). Double valve (5) was switched into the position (I) so that H 2 S was purged to the absorbing solution of 2 % zinc acetate in the reaction tube (3) by bubbling nitrogen through glass bubbler (8) at flow rate of 0.3 ml/min.…”

Section: Calibration Graphmentioning

confidence: 99%

“…The differences between flow velocities of adjacent streamlines, flow reversals and flow acceleration are the only factors that promote mixing. In many cases dispersion minimized by increase the magnitude of the flow reversal and the distance traveled [8], accomplished mixing is gained by stopping the flow [9] that elongates the time of analysis.…”

Section: Introductionmentioning

confidence: 99%

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Simultaneous stepwise injection-photometric determination of nitrite and nitrate ions in aqueous media

2010

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The new approach to automate stationary techniques to analyze gas using a stepwise injection analysis (SWIA) is revealed and determination of hydrogen sulfide in natural gas using SWIA is described. The determination is based on absorption of hydrogen sulfide into open to the air reaction tube with 2% zinc acetate solution, stepwise injection of the reagents to the reaction tube to form a methylene blue and subsequent measurement of the downstream colored product at 670 nm. The open to the air reaction tube is a part of hydraulic system and has PTFE granules to increase a surface area during the gas sample bubbling. Nitrogen was purged to the reaction tube for enhanced mixing. All experimental manipulations were controlled by software.The absorbing solution has an absorption efficiency of >98% at a sampling flow rate of 0.3 l/min. This method provides a linear working range of 0.5 to 20 mg/m 3 with a relative standard deviation of 2.5 % (n=10) at the 5 mg/m 3 level for 3 liters of gas sample and concentration time of 10 min. The determination limit of 0.1 mg/m 3 was achieved using 3 liters of gas sample and time of one cycle of 18.5 min.

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Section: Generation Of the H 2 S Standard Gas Mixturesmentioning

confidence: 99%

Section: Calibration Graphmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Simultaneous stepwise injection-photometric determination of nitrite and nitrate ions in aqueous media

2010

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“…This separator could be used for about 1 week without exchange of the membrane in the berberine-perchlorate ion pair extraction system. 22 Chromatomembrane cells have been proposed for sample preconcentration by a liquid-liquid extraction procedure by Moskvin et al [24][25][26] Figures 5 and 6 show a schematic flow diagram of an automated preconcentration and extraction system by means of a 16-port valve for anionic surfactant determination. The novel extraction device consists of a rectangular block of biporous PTFE.…”

Section: Flow Injection Analysis Coupled With Liquidliquid Extractionmentioning

confidence: 99%

Advancement of Flow-based Analysis with Alternative Chemical Reactions and New Devices for Environmental and Biological Samples

Sakai

Teshima

2008

ANAL. SCI.

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This review includes our researches and other methodologies related to flow-based techniques, such as flow injection analysis (FIA) and sequential injection analysis (SIA). The methods will demonstrate semi-and full automated FIA and SIA, including liquid-liquid and liquid-solid extraction. FIA using alternative chemical reactions in the aqueous solution was applied to the trace analysis of metals in biological and environmental samples. For durable liquid-liquid extraction, several phase separators were designed. Moreover, multi-channel FIA with newly designed flow cells and SIA with labon-valve devices have been used for the simultaneous and successive determination of metals and organic compounds. On-line solid phase extraction (SPE) has also been proposed for highly sensitive analysis of organic and inorganic compounds.

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“…There have been a number of well-established analytical methods for the determination of AS, for instance, biphase titration, 2 high performance liquid chromatography (HPLC), 3 extraction spectrophotometry, 4,5 spectrophotometry in water phase, 6 and fluorimetric methods, 7,8 and so on. Among these methods, titration technique enjoys decent accuracy and precision.…”

Section: Introductionmentioning

confidence: 99%

Study on the Interaction between a Novel Ionic Liquid Probe and Anionic Surfactants Using Resonance Light Scattering Spectra and Its Analytical Application

Wang

Zeng

et al. 2010

Chin. J. Chem.

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The interaction between anionic surfactants (AS) and 1-hexadecyl-3-methylimidazolium bromide [C 16 mim]Br was studied by using resonance light scattering (RLS) technique, UV-Vis spectrophotometry and fluorometric methods. In Britton Robinson (BR) buffer (pH 6.0), [C 16 mim]Br reacted with AS to form supermolecular complex which resulted in enhancement in RLS intensity. Their maximum RLS wavelengths were all at 390 nm. Some important interacting experimental variables, such as the solution acidity, [C 16 mim]Br concentration, salt effect and addition order of the reagents, were investigated and optimized. Under the optimum conditions, quantitative determination ranges were 0.001-7 µg•mL -1 for dodecyl sodium sulfate (SDS), 0.001-6 µg•mL -1 for sodium dodecylbenzene sulfonate (SDBS) and 0.005-7 µg•mL -1 for sodium lauryl sulfonate (SLS), respectively, while the detection limits were 1.3 ng•mL -1 for SDS, 1.0 ng•mL -1 for SDBS and 5.1 ng•mL -1 for SLS, respectively. Based on the ion-association reaction, a highly sensitive, simple and rapid method has been established for the determination of AS.

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Cited by 5 publications

References 2 publications

Simultaneous stepwise injection-photometric determination of nitrite and nitrate ions in aqueous media

Simultaneous stepwise injection-photometric determination of nitrite and nitrate ions in aqueous media

Advancement of Flow-based Analysis with Alternative Chemical Reactions and New Devices for Environmental and Biological Samples

Study on the Interaction between a Novel Ionic Liquid Probe and Anionic Surfactants Using Resonance Light Scattering Spectra and Its Analytical Application

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