Thin sensitive organic membranes on selective iron-ion sensors (original) (raw)
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An iron(III) ion-selective sensor based on a μ-bis(tridentate) ligand
Talanta, 2007
A -bis(tridentate) ligand named 2-phenyl-1,3-bis[3 -aza-4 -(2 -hydroxyphenyl)-prop-4-en-1 -yl]-1,3-imidazolidine (I) has been synthesized and scrutinized to develop iron(III)-selective sensors. The addition of sodium tetraphenyl borate and various plasticizers, viz., chloronaphthalene, dioctylphthalate, o-nitrophenyl octyl ether and dibutylphthalate has been used to substantially improve the performance of the sensors. The membranes of various compositions of the ligand were investigated and it was found that the best performance was obtained for the membrane of composition (I) (10 mg):PVC (150 mg):chloronaphthalene (200 mg):sodium tetraphenyl borate (9 mg). The sensor showed a linear potential response to iron(III) over wide concentration range 6.3 × 10 −6 to 1.0 × 10 −1 M (detection limit 5.0 × 10 −6 M) with Nernstian slope (20.0 mV/decade of activity) between pH 3.5 and 5.5 with a quick response time of 15 s. The potentiometric selectivity coefficient values as determined by match potential method (MPM) indicate excellent selectivity for Fe 3+ ions over interfering cations. The sensor exhibits adequate life of 2 months with good reproducibility. The sensor could be used in direct potentiometry.
Journal of Hazardous Materials, 2010
In this novel, the iron(III)-PVC membrane sensor was investigated based on a new 1,1'-(iminobis(methan-1-yl-1-ylidene))dinaphthalen-2-ol (IBMYD) synthetic ionophore as a suitable carrier. The best performance was observed for the membrane composition including 33.0% PVC, 65.0% TEHP, 1.0% NaTPB and 1.0% ionophore. The electrode displayed a linear potential response over a wide concentration range from 1.0 x 10(-7) to 1.0 x 10(-1)mol L(-1), with a detection limit of 5.0 x 10(-8)mol L(-1) and a good Nernstian slope of 19.9+/-0.3 mV decade(-1). The sensor possessed some advantages such as short conditioning time, very fast response time (<12s) and especially good discriminating ability towards Fe(III) ions over a wide variety of alkali, alkaline earth, transition, and heavy metal ions. The potential response of the proposed sensor was independent of the pH of the test solution, in the pH working range from 3.0 to 6.3. The fabricated electrode was applied for at least 2 months, without any measurable divergence in the potential characteristics. The optimized sensor was used successfully for direct and indirect determination of free iron species in some different synthetic and real samples with satisfactory results.
Current Analytical Chemistry, 2014
A novel polyvinyl chloride (PVC) membrane sensor that is highly selective to Fe 3+ ions was prepared by using 5-chloro-3-[4-(trifluoromethoxy)phenylimino]indolin-2-one (CFMEPI) ionophore. The sensor exhibits a Nernstian response for Fe 3+ ions over a wide concentration range (1.0 ×10 -2 −1.0×10 -6 M) with a slope of 46.7±0.5 mV per decade. The sensor has a response time of 20s and can be used for at least 3 months without any measurable divergence in potential. It was concluded that the sensor response was pH independent in the range of 4.0-8.61. The sensor has some advantages such as short analysis time, particularly high selectivity towards iron (III). The sensor was used successfully for direct determination of Fe 3+ in several synthetic and real samples with satisfactory results.
PVC-membrane potentiometric sensors based on a recently synthesized Schiff base for Fe(III) ion
Bulletin of the Chemical Society of Ethiopia, 2012
A potentiometric iron sensor based on the use 3-(2-diethylamino-ethylimino)-1,3-dihydro-indol-2-one (DEDIO) as an ionophore in poly(vinyl chloride) (PVC) matrix, is reported. The plasticized membrane sensor exhibits a Nernstian response for Fe(III) ions over a wide concentration range (2.0 × 10-6-5.0 × 10-2 M) with a super Nernstian slope of 26(±1) mV per decade. It has a fast response time of <12 s and can be used for ten weeks without any considerable divergences in its potentials .the electrode can be used in the pH range 4.5-8.0. The proposed sensor shows fairly good discriminating ability towards Fe(III) ion in comparison with a large number of alkali, alkaline earth, transition and heavy metal ions. The sensor was used as indicator electrode in potentiometric titration of Fe(III) ions vs. EDTA.
2009
A new Fe 3+ ion-selective membrane electrode based on 6-ketomethyl phenanthridine (6-KMPT) and 1-(4dimethyl aminophenyl)-2-(5H-phenanthridine-6-ylidene)-ethanone, which were incorporated in a plasticized polyvinyl chloride (PVC) membrane, is described. The optimized membrane demonstrated a linear dynamic range of 5.2 × 10 −6-1.0 × 10 −2 M, with a near Nernstian slope of 19.5 ± 1.5 mV per decade and a detection limit of 1.2 × 10 −6 M. The electrode showed high selectivity for Fe 3+ ions in comparison to other metal ions. The effect of membrane composition on the potential response of the electrode was studied. The best performance was observed for the membrane comprised of electroactive material (6-KMPT), dioctyl phthalate (DOP) as plasticizer, and PVC in the optimum ratio of 5:67:28% w/w. The pH working range of the sensor was 1.2-3.0. The proposed Fe 3+ sensor was successfully used for determining the presence of iron in pharmaceuticals and the results were in good agreement with the value obtained using the atomic absorption spectroscopic method.
Field effect transistors have risen as one of the most promising techniques in the development of biomedical diagnosis and monitoring. In such devices, the sensitivity and specificity of the sensor rely on the properties of the active sensing layer (gate dielectric and probe layer). We propose here a new type of transistor developed for the detection of Fe 3 þ ions in which this sensing layer is made of a monolayer of lipids, engineered in such a way that it is not sensitive to pH in the acidic range, therefore making the device perfectly suitable for biomedical diagnosis. Probes are γ-pyrone derivatives that have been grafted to the lipid headgroups. Affinity constants derived for the chelator/Fe 3 þ complexation as well as for other ions demonstrate very high sensitivity and specificity towards ferric ions with values as high as 5.10 10 M and a detected concentration as low as 50 fM. (I. Ozerov), dallaporta@cinam.univ-mrs.fr (H. Dallaporta), raimundo@cinam.univ-mrs.fr (J.-M. Raimundo), charrier@cinam.univ-mrs.fr (A.M. Charrier).
A Novel Iron(III) Selective Membrane Electrode Containing a Tripodal Polycatacholamine as Sensor
Bulletin of the Korean Chemical Society, 2011
A novel poly(vinylchloride)-based membrane sensor using N 1 ,N 3 ,N 5-tris(2-(2,3-dihydroxybenzylamino)ethyl)cyclohexane-1,3,5-tricarboxamide (CYCOENCAT, L) as ionophore has been prepared and explored as Fe 3+ selective electrode. The membrane electrode composed of ionophore, poly(vinylchloride) and o-nitropheyloctyl ether in the optimum ratio 4:33:63 gave excellent potentiometric response characteristics, and displayed a linear log[Fe 3+ ] versus EMF response over a wide concentration range of 1.0 × 10 −5-1.0 × 10 −1 M with super nernstian slope of 28.0 mV/decade and the detection limit of 8.0 × 10 −6 M. The proposed ion selective electrode showed fast response time (< 15 s), wide pH range (3.0-7.0), high non-aqueous tolerance (up to 20%) and adequate long life time (120 days). It also exhibited very good selectivity for Fe 3+ relative to a wide variety of alkali, alkaline earth, transition and heavy metal ions. Further, the analytical applicability of the sensor was tested as an indicator electrode in the potentiometric titration of Fe 3+ with EDTA.
Biosensors and Bioelectronics, 2014
Field effect transistors have risen as one of the most promising techniques in the development of biomedical diagnosis and monitoring. In such devices, the sensitivity and specificity of the sensor rely on the properties of the active sensing layer (gate dielectric and probe layer). We propose here a new type of transistor developed for the detection of Fe 3 þ ions in which this sensing layer is made of a monolayer of lipids, engineered in such a way that it is not sensitive to pH in the acidic range, therefore making the device perfectly suitable for biomedical diagnosis. Probes are γ-pyrone derivatives that have been grafted to the lipid headgroups. Affinity constants derived for the chelator/Fe 3 þ complexation as well as for other ions demonstrate very high sensitivity and specificity towards ferric ions with values as high as 5.10 10 M and a detected concentration as low as 50 fM. (I. Ozerov), dallaporta@cinam.univ-mrs.fr (H. Dallaporta), raimundo@cinam.univ-mrs.fr (J.-M. Raimundo), charrier@cinam.univ-mrs.fr (A.M. Charrier).
Sensors and Actuators B: Chemical, 2014
The synthesis and properties of new silicone-based functional materials having attached cyclam macrocycles have been assessed with regard to their application as ion-sensitive membranes of chemical sensors. The preparation process of thin films of the sensitive materials has been designed so that each chemical compound is attached by means of chemical bonds: the macrocyclic ionophore was chemically bound to the silicone polymer and the polymer material was attached to the sensitive surface of the electrochemical devices by means of chemical grafting. The properties of such materials have been evaluated for detection of iron(III) species in water using ion-sensitive field-effect transistor (ISFET) and electrolyte-insulator-semiconductor (EIS) structures, both sensitized by a coating with the functional polymer materials. Two types of cyclam derivatives and two types of synthesis processes have been compared with that respect. The first material, "PDMS-Cyclam", was prepared by grafting N-10undecenyl-cyclam to poly(methylhydrosiloxane) (PMHS). The cyclam ionophore of the second material, "PDMS-Naphthyl-Cyclam", bore a naphthyl pendent group that enhanced the complexing properties for Fe 3+ ions. Linear response with respect to the pFe(III) = −Log[Fe 3+ ] was observed over three decades (EIS) or two decades (ISFET) of concentration. A Nernstian response toward Fe 3+ ions was observed for the "PDMS-Naphthyl-Cyclam" membrane. These devices exhibit good chemical stability and a long lifetime in aqueous medium.