Development of flow systems incorporating membraneless vaporization units and flow-through contactless conductivity detector for determination of dissolved ammonium and sulfide in canal water

Alahmad, Waleed; Pluangklang, Thanakorn; Mantim, Thitirat; Cerdà, Vı́ctor; Wilairat, Prapin; Ratanawimarnwong, Nuanlaor; Nacapricha, Duangjai

doi:10.1016/j.talanta.2017.09.037

Cited by 31 publications

(14 citation statements)

References 26 publications

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“…For comparative purposes, the performance characteristics of the proposed method and other selected on-line separation methods based on gas diffusion, pervaporation, membranelles-GD, and HS-SD devises, reported in the literature for ammonium determination, are compiled in Table 1. As it is shown herein, the P&T-SIA method reveals satisfactory sensitivity with better detection limits than earlier works [10,12,[15][16][17][29][30][31] for ammonium assays. In addition, it should be considered that the proposed system overcomes membrane-related problems and allows for the determination of untreated samples, minimizing the cost of analysis.…”

Section: Figures Of Meritsupporting

confidence: 50%

Automatic On-Line Purge-and-Trap Sequential Injection Analysis for Trace Ammonium Determination in Untreated Estuarine and Seawater Samples

Dimitriadou

Anthemidis

2020

Molecules

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An innovative automatic purge-and-trap (P&T) system coupled with fluorimetric sequential injection (SI), for the on-line separation and preconcentration of volatile compounds, is presented. The truth of concept is demonstrated for the ammonium fluorimetric determination in environmental water samples with complex matrices without any pretreatment. The P&T flow system comprises a thermostated purge-vessel where ammonium is converted into gaseous ammonia and a trap-vessel for ammonia collection. This configuration results in matrix removal as well as analyte preconcentration, avoiding membrane-associated problems. All the main parameters affecting the efficiency of a P&T system were studied and optimized. The proposed method is characterized by a working range of 2.7–150.0 μg L−1 of NH4+, with a detection and quantification limit of 0.80 and 2.66 μg L−1, respectively, for a 10-mL sample consumption. The accuracy of the method was assessed by recovery assays in seawater, estuarine, and lake water samples as well as by the analysis of standard reference material.

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Section: Figures Of Meritsupporting

confidence: 50%

Automatic On-Line Purge-and-Trap Sequential Injection Analysis for Trace Ammonium Determination in Untreated Estuarine and Seawater Samples

Dimitriadou

Anthemidis

2020

Molecules

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“…The C4D detection flow cell [23,24,26] is a polyether ether ketone (PEEK) tubing (1.0 mm i.d., 1.6 mm o.d.) with two cylindrical bands of painted silver conductive ink (2.0 cm long and 0.5 mm apart) as electrodes.…”

Section: Flow Systems and Operationmentioning

confidence: 99%

“…C4D has advantages over conventional conductivity detector for flow systems since the electrodes are easily mounted on the outer wall of the flow tube and is robust in use. Several applications of MBL-VP-C4D for the analysis of volatile gases converted from ionic analytes have been presented, such as dissolved ammonium and sulfide in canal water [23] and sulfite in wines [24].…”

Section: Introductionmentioning

confidence: 99%

Simple Flow-Based System with an In-Line Membrane Gas–Liquid Separation Unit and a Contactless Conductivity Detector for the Direct Determination of Sulfite in Clear and Turbid Food Samples

et al. 2020

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This study presents a simple flow-based system for the determination of the preservative agent sulfite in food and beverages. The standard method of conversion of sulfite ions into SO2 gas by acidification is employed to separate the sulfite from sample matrices. The sample is aspirated into a donor stream of sulfuric acid. A membrane gas–liquid separation unit, also called a ‘gas-diffusion (GD)’ unit, incorporating a polytetrafluoroethylene (PTFE) hydrophobic membrane allows the generated gas to diffuse into a stream of deionized water in the acceptor line. The dissolution of the SO2 gas leads to a change in the conductivity of water which is monitored by an in-line capacitively coupled contactless conductivity detector (C4D). The conductivity change is proportional to the concentration of sulfite in the sample. In this work, both clear (wine) and turbid (fruit juice and extracts of dried fruit) were selected to demonstrate the versatility of the developed method. The method can tolerate turbidity up to 60 Nephelometric Turbidity Units (NTUs). The linear range is 5–25 mg L−1 SO32− with precision <2% RSD. The flow system employs a peristaltic pump for propelling all liquid lines. Quantitative results of sulfite were statistically comparable to those obtained from iodimetric titration for the wine samples.

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“…Carbon dioxide was diffused from an acidified seawater sample across a semipermeable membrane into an acceptor stream (aqueous alkaline solution) and changes in conductivity, which were directly related to CO 2 content in the sample, were monitored by C 4 D . Similarly, C 4 D was also employed in sequential injection analysis (SIA) for the determination of sulfite in wines and of ammonium and sulfide in canal water . In these cases, separations of the analytes were carried out in membraneless gas diffusion cells.…”

Section: Other Applications Of C4dmentioning

confidence: 99%

Contactless conductivity detection for analytical techniques: Developments from 2016 to 2018

Kubáň

Hauser

2018

Electrophoresis

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The publications concerning capacitively coupled contactless conductivity detection for the 2-year period from mid-2016 to mid-2018 are covered in this update to the earlier reviews of the series. Relatively few reports on fundamental investigations or new designs have appeared in the literature in this time interval, but the development of new applications with the detection method has continued strongly. Most often, contactless conductivity measurements have been employed for the detection of inorganic or small organic ions in conventional capillary electrophoresis, less often in microchip electrophoresis. A number of other uses, such as detection in chromatography or the gauging of bubbles in streams have also been reported.

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Development of flow systems incorporating membraneless vaporization units and flow-through contactless conductivity detector for determination of dissolved ammonium and sulfide in canal water

Cited by 31 publications

References 26 publications

Automatic On-Line Purge-and-Trap Sequential Injection Analysis for Trace Ammonium Determination in Untreated Estuarine and Seawater Samples

Automatic On-Line Purge-and-Trap Sequential Injection Analysis for Trace Ammonium Determination in Untreated Estuarine and Seawater Samples

Simple Flow-Based System with an In-Line Membrane Gas–Liquid Separation Unit and a Contactless Conductivity Detector for the Direct Determination of Sulfite in Clear and Turbid Food Samples

Contactless conductivity detection for analytical techniques: Developments from 2016 to 2018

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