Enhanced surfactant determination by ion-pair formation using flow-injection analysis and dynamic surface tension detection

Young, Toby E.; Synovec, Robert E.

doi:10.1016/0039-9140(95)01762-3

Cited by 26 publications

(18 citation statements)

References 32 publications

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“…18 Of the various studies of SDS trace metals interaction with chromophores such as ruthenium complexes, 19 and those related to interactions between anionic surfactant and cationic dyes in solution, dye surfactant interactions including dye surfactant ion paired complexes and dye surfactant aggregate 14 signify the importance of the study. Molecular absorption and fluorescence spectrophotometer have proven themselves useful tools to study such interactions.…”

Section: Resultsmentioning

confidence: 99%

“…Thus it is necessary to determine these surfactant in water for the evaluation of the pollution industrial and domestic waste. Various techniques such as Titration, 10 Chromotography, 11 Microbial sensor, 12 Amperometric bio-sensor, 13 ion pair formation with in situ flow injection analysis utilizing dynamic surface tension detection, 14 Ion selective electrode 15 Adsorptive Stripping Voltammetric 16 determination have been reported for the determination of the anionic surfactant. All these methods needs a lot of time or need sophisticated instrumentation and expertise.…”

Section: Introductionmentioning

confidence: 99%

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Reliable Technique for the Determination of Sodium Dodecyl Sulphate by Crystal Violet in Relation to the Effluents of Durg‐Bhilai Region

Sar

Verma

Pandey

et al. 2009

J Chinese Chemical Soc

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A simple spectrophotometric method applicable to waste water bodies is developed for the determination of anionic surfactant (AS). An ion-association complex is formed between an anionic surfactant Sodium dodecyl sulphate (SDS) and a cationic dye Crystal Violet (CV). The dark blue colored complex can be easily extracted in organic solvent benzene. The absorbance of the complex in benzene layer is measured spectrophotometrically at maximum wave length (l max) of 565 nm. Under the optimal experimental conditions, absorbance of the organic extractant obeyed Beer's law over the range of 0.75-10.00 µg mL -1 of SDS and the LOD was 0.01312 µg L -1 . It is noticed that the present method is much easier, less time consuming and applicable to accelerated urbanization and industrial development found in newly formed Chhattisgarh state in Central India.The validity of the method was tested in regionalized industrial and domestic waste water runoff.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Reliable Technique for the Determination of Sodium Dodecyl Sulphate by Crystal Violet in Relation to the Effluents of Durg‐Bhilai Region

Sar

Verma

Pandey

et al. 2009

J Chinese Chemical Soc

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“…8 The details of dynamic surface tension detection have been described in previous work. [6][7][8]10,11 The DSTD was configured from a pressure sensor (Validyne P30 SD-20-2369; Northridge, CA), a capillary sensing tip made from a short piece of poly(etheretherketone) (PEEK) tubing (Upchurch, Oak Harbor, WA; 457 µm i.d. and 635 µm o.d.)…”

Section: Methodsmentioning

confidence: 99%

Simple Sequential Injection Analysis Systems with a Dynamic Surface Tension Detector

et al. 2006

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Many analytical techniques have been developed for surfacetension measurements in both static and dynamic processes, such as the dynamic drop volume, 1 the capillary pressure tensiometry, 2 the drop shape method, 3 the dynamic capillary rise technique, 4 and the oscillating jet method. 5Most classical methods are traditionally applied under static conditions, which are time and reagent consuming and difficult to perform. Moreover, these methods are not practical for use as a detection system for flowbased analytical techniques (namely, flow injection analysis (FIA), sequential injection analysis (SIA), and liquid chromatography (LC), which are available for real-time process analysis. The dynamic surface tension detector (DSTD), a surface-tension measurement sensor, can be coupled as a detection unit with flow-based analytical techniques. DSTD is based on a drop pressure measurement of a growing drop. The DSTD is typically assembled from a capillary sensing tip connected to the main flow, and a pressure sensor that is mounted onto the side arm of the main flow. The pressure sensor measures the internal pressure of a growing drop relative to the atmospheric pressure. The pressure signal is dependent on the surface-tension properties of a given analyte, which flows through the end of the capillary sensing tip. This DSTD has been coupled with FIA, 6,7 SIA 8 and LC 9,10 for studying the interfacial tension properties of surface-active molecules at an air-liquid interface. A SIA system coupled with DSTD has been developed to perform high-throughput analyses of the interfacial properties of surface-active samples. 8 Such a SIA/DSTD system provides less reagent consumption and requires significantly less analysis time than the traditional FIA/DSTD.In the present work, attempts were made to develop SIA/DSTD instrumentation that is simpler than the previous one. 8 The developed SIA systems employ only a single syringe pump and one selection valve. New applications have also been investigated. One of the SIA systems has been demonstrated for the very simple and fast screening of water quality, based on the effects of ions on dynamic surface tension behaviors of a surfactant.Another simple SIA system has also been demonstrated for the quantification of a surfactant in an uncomplicated sample using a single standard calibration based on the on-line dilution of a standard. ExperimentalInstrumentation Figure 1 depicts a schematic diagram of the SIA/DSTD system. The SIA system was assembled from a syringe pump (XP-3000 Syringe Pump with a valve; Cavro, San Jose, CA), 10 port multiposition valve (C25-3180EMH, VICI, Houston, TX), holding coil (PTFE tubing, 0.76 mm i.d., 1.59 mm o.d., 2500 µl) and mixing coil (PTFE tubing, 0.76 mm i. Simple sequential injection analysis systems with DSTD (SIA/DSTD) have been developed. One was employed for the study of the effects of the ion contents in solutions to the dynamic surface pressure of ionic surfactants. The results from the studies show the possibility for an alternative simple fast ...

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“…Real-time dynamic surface pressure measurement on flowing liquids is accomplished by the DSTD through a novel calibration procedure in conjunction with pneumatic drop detachment [35,36,37,38]. Thus, the DSTD has been used for flow injection analysis (FIA) and high performance liquid chromatography (HPLC) [31,35,36,37,38,39,40,41,42,43,44].…”

Section: Introductionmentioning

confidence: 99%

Determination, by dynamic surface-tension analysis, of the molar mass of proteins denatured in guanidine thiocyanate

Quigley

Bramanti²,

Staggemeier

et al. 2004

Analytical and Bioanalytical Chemistry

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A drop-based dynamic surface-tension detector (DSTD) has been used to study the dynamic surface tension behavior of proteins denatured in guanidine thiocyanate (GndSCN). The dynamic surface tension at the air-liquid interface is obtained by measuring the internal pressure of drops that grow and detach at a specified rate. In the method the sample of interest is injected and subsequently flows to the DSTD-sensing capillary tip. For this work, a novel DSTD calibration procedure utilizing two distinct mobile phases is applied. Here, the mobile phases are aqueous with different constituents, for example GndSCN and phosphate buffer, either added or omitted. The dual-mobile phase calibration procedure gives the analyst the capability of making protein measurements in a GndSCN-phosphate buffer mobile phase, while measuring a calibration standard in another mobile phase, such as water, in which the surface tension of the calibration standard is readily available. Results are presented with drop volumes of either 2 microL (i.e. 2-s drops) or 7 microL (i.e. 7-s drops) for proteins varying in molar mass from 12,000 to 330,000 g mol(-1). We demonstrate that the DSTD can be used to determine the molar mass of proteins denatured in GndSCN. The method applies a regime where the denatured protein is detected by surface-active properties, and selectivity with regard to molar mass is contained in the dynamic component of the DSTD signal. The dynamic surface pressure signals of the denatured proteins suggest that diffusion plays a large role in the kinetics of the surface activity. The limit of detection for the denatured proteins studied ranged from 3 mg L(-1) to 14 mg L(-1). The DSTD, coupled with the novel dual-mobile phase calibration procedure, can be used to investigate the fundamental properties of proteins. Insight into the behavior at the air-liquid interface for native and denatured proteins is achieved; this is a novel tool for studying protein denaturation, complementary to other common approaches such as spectroscopy and calorimetry. Furthermore, the reported method could be widely applied to the study of effects on the interfacial properties of proteins after a variety of chemical and physical modifications that are possible with the dual-mobile phase calibration procedure.

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Enhanced surfactant determination by ion-pair formation using flow-injection analysis and dynamic surface tension detection

Cited by 26 publications

References 32 publications

Reliable Technique for the Determination of Sodium Dodecyl Sulphate by Crystal Violet in Relation to the Effluents of Durg‐Bhilai Region

Reliable Technique for the Determination of Sodium Dodecyl Sulphate by Crystal Violet in Relation to the Effluents of Durg‐Bhilai Region

Simple Sequential Injection Analysis Systems with a Dynamic Surface Tension Detector

Determination, by dynamic surface-tension analysis, of the molar mass of proteins denatured in guanidine thiocyanate

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