Response characteristics of lead-selective membrane sensors based on a newly synthesized quinoxaline derivatives as neutral carrier ionophores

Kamel, Ayman H.; El‐Naggar, Abeer M.; Argig, Amina A. A.

doi:10.1007/s11581-017-2141-7

Cited by 5 publications

(3 citation statements)

References 49 publications

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“…The flow injection manifold is linked with a potentiometric detector and is typically set up with minimum complication. The flow cell used to detect 2,4DCP was fabricated with a fixed geometry and a minimum dead space to acquire a small sensor size with low dispersion of samples in the cell and a high response with short recovery time [33]. After checking/ setting the several chemical, hydrodynamic, and physical fac tors, the last FIA assembly was achieved.…”

Section: Flow Injection Analysismentioning

confidence: 99%

Solid-contact potentiometric sensors for reliable automatic quantification of 2,4-dichlorophenol (2,4-DCP) as a food taint

EL-Shalakany

Hamza

Kamel

2018

Meas. Sci. Technol.

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Sensitive, selective, and simple solidcontact potentiometric sensors were fabricated and characterized for 2,4dichlorophenol (2,4DCP) quantification. Membrane sensors based on the use of tridodecylmethylammonium chloride (TDMAC) and Aliquat 336 as anion exchangers were distributed in plasticized polyvinyl chloride (PVC) matrix. They revealed superNernstian responses with slopes of −70.3 and −78.2 over linear ranges 5.8 × 10 −7 -1.0 × 10 −3 M and 3.3 × 10 −6 -1.0 × 10 −3 M and with detection limits of 0.07 and 0.11 µg ml −1 , for TDMAC and Aliquat 336, respectively. The sensors were compared with conventional sensors. The effect of plasticizer on the potentiometric response and diverse foreign common ions effect were examined. Sensors of both types showed a long life span, good selectivity for 2,4DCP over a wide assortment of other common ions, long term stability, high reproducibility, and rapid response. Validation tests illustrated good performance characteristics of the recommended sensors by evaluating the lower detection limit, range, accuracy, precision, repeatability, and betweendayvariability. The sensors were effectively applied for the persistent monitoring of 2,4DCP using a flow injection system. The sensors were applied to the 2,4DCP potentiometric determination in spiked urine and fish samples. Recoveries ranged from 90% to 110%.

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Section: Flow Injection Analysismentioning

confidence: 99%

Solid-contact potentiometric sensors for reliable automatic quantification of 2,4-dichlorophenol (2,4-DCP) as a food taint

EL-Shalakany

Hamza

Kamel

2018

Meas. Sci. Technol.

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“…Liquid contact sensors were prepared as described previously. 34,35 A 2.0 mg portion of the ionophore was mixed with 126 mg of the plasticizer, 66 mg of PVC, 1.0 mg TDMAC and dissolved in 3 mL THF in a glass ring (2.2 cm diameter). The cocktail left to stand overnight for solvent evaporation at room temperature.…”

Section: Sensor Preparation and Emf Measurementsmentioning

confidence: 99%

Potentiometric Study for Rapid Continuous Monitoring of Trace Level Thiocyanate Using Solid and Conventional Types PVC Membrane Sensors

Kamel

2018

ECB

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A comparative study using two different thiocyanate electrode designs was conducted; a solid type electrode (type A) and conventional liquid inner contact electrode (type B). The fabrication of these electrodes was based on Al (III) [4-(2-Pyridylazo) resorcinol] (Al/PAR) and Mg (II) phthalocyanine (MgPC) complexes as a charged carrier, aliquate 336S and TDMAC as ion exchangers in plasticized poly (vinyl chloride) membrane. Electrodes type (A) revealed significantly enhanced response towards SCNions with displayed near-Nernstian slope of-53.7-55.8 mV decade-1 over the concentration range 5.0x10-6-1.0x10-2 mol L-1 and a detection limit of 0.4-3.7 µg mL-1. Type (B) sensors revealed near-Nernstian potential response to SCNwith a slope of-45.9-62.4 mV decade-1 over a linear range of 5.0x10-5-1.0x10-2 mol L-1 and a detection limit of 0.12-0.3 µg mL-1. Membrane sensors based on (Al/PAR) and (MgPC) using the so called "fixed interference method" (FIM) exhibited a good selectivity over different anions which differ significantly from the classical Hofmeister series. All sensors were integrated in a flow system for continuous monitoring of thiocyanate under hydrodynamic mode of operation. The sensors revealed a frequency of ~ 54 samples h-1. Application of the proposed sensors for SCNdetermination in biological fluid samples such as saliva collected from some non-smoker and smoker donors. Determination of cyanide content in electroplating wastewater samples after its conversion into thiocyanate was also applied. The results obtained from the proposed sensors were agreed with that obtained using the standard methods of thiocyanate and cyanide analysis.

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“…In recent years, potentiometric ion sensors, or the so called “ion-selective electrodes (ISEs)” have become an attractive technique for trace-level environmental assessment. This can be attributed to their intrinsic advantages such as excellent selectivity, ease of use and high reliability [ 15 , 16 , 17 , 18 ]. However, it should be noted that most of these potentiometric sensors were introduced for inorganic ions determination, but potentiometric sensors for organic anions have not been widely reported.…”

Section: Introductionmentioning

confidence: 99%

All Solid-State Poly (Vinyl Chloride) Membrane Potentiometric Sensor Integrated with Nano-Beads Imprinted Polymers for Sensitive and Rapid Detection of Bispyribac Herbicide as Organic Pollutant

et al. 2019

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All-solid-state potentiometric sensors were prepared by using polyaniline (PANI) as the solid contact material. A film of PANI (thickness approximately being 0.25 µm) was deposited on a solid substrate (carbon screen printed platform). The PANI layer was subsequently coated with an ion-selective membrane (ISM) containing uniform-sized molecularly imprinted nanoparticles to produce a solid-contact ion-selective electrode (SC/ISE) for bispyribac herbicide (sensor I). In addition, aliquat 336 was also used as an ion exchanger in plasticized PVC membrane (sensor II). The proposed sensors revealed a remarkably improved sensitivity towards bispyribac ions with anionic slopes of −47.8 ± 1.1 (r2 = 0.9995) and −44.4 ± 1.4 (r2 = 0.9997) mV/decade over a linear range 1.0 × 10−2–8.6 × 10−6 M, 1.0 × 10−2–9.0 × 10−6 M and detection limits of 1.33 and 1.81 µg/mL for sensors I and II, respectively.Selectivity of both sensors is significantly high for different common pesticides and inorganic anions. The potential stability of the SC/ISEs was studied using chronopotentiometry. Electrochemical impedance spectrometry was used to understand the charge-transfer mechanisms of the different types of ion-selective electrodes studied. The impedance response of the electrodes was modelled by using equivalent electrical circuits. The sensors were used for a direct measurement of the bispyribac content in commercial herbicide formulations and soil samples collected from agricultural lands planted with rice and sprayed with bispyribac herbicide. The results agree fairly well with data obtained using HPLC method.

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Response characteristics of lead-selective membrane sensors based on a newly synthesized quinoxaline derivatives as neutral carrier ionophores

Cited by 5 publications

References 49 publications

Solid-contact potentiometric sensors for reliable automatic quantification of 2,4-dichlorophenol (2,4-DCP) as a food taint

Solid-contact potentiometric sensors for reliable automatic quantification of 2,4-dichlorophenol (2,4-DCP) as a food taint

Potentiometric Study for Rapid Continuous Monitoring of Trace Level Thiocyanate Using Solid and Conventional Types PVC Membrane Sensors

All Solid-State Poly (Vinyl Chloride) Membrane Potentiometric Sensor Integrated with Nano-Beads Imprinted Polymers for Sensitive and Rapid Detection of Bispyribac Herbicide as Organic Pollutant

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