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Sensors, Volume 2, Issue 10 (October 2002), Pages 383-435

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Editorial

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Open AccessEditorial Ion Sensors
Sensors 2002, 2(10), 383; doi:10.3390/editorial1
Received: 31 October 2002 / Published: 31 October 2002
PDF Full-text (13 KB)
(This article belongs to the Special Issue Ion Sensors)

Research

Jump to: Editorial, Review

Open AccessArticle Dibenzocyclamnickel(II) as Ionophore in PVC-Matrix for Ni2+-Selective Sensor
Sensors 2002, 2(10), 384-396; doi:10.3390/s21000384
Received: 10 September 2002 / Accepted: 1 October 2002 / Published: 8 October 2002
Cited by 14 | PDF Full-text (648 KB)
Abstract
The tetramethyldibenzocyclam derivative, was synthesized and characterized and was used for fabrication of potentiometric sensor for Ni2+ metal ion. 5,7,8,14-tetramethyldibenzo[b,i]-1,4,8,11-tetrazacyclotetradecanenickel(II)chloride, ([Ni(Me4Bzo2[14]ane N4)]Cl2) (II) was obtained in good yield as orange red salt by Fe/HCl
[...] Read more.
The tetramethyldibenzocyclam derivative, was synthesized and characterized and was used for fabrication of potentiometric sensor for Ni2+ metal ion. 5,7,8,14-tetramethyldibenzo[b,i]-1,4,8,11-tetrazacyclotetradecanenickel(II)chloride, ([Ni(Me4Bzo2[14]ane N4)]Cl2) (II) was obtained in good yield as orange red salt by Fe/HCl reduction of the corresponding tetraazaannulene complex [Ni(Me4Bzo2taa)], (I). Membrane having [Ni(Me4Bzo2[14]aneN4)]Cl2 (II) as electroactive material, sodium tetraphenylborate (NaTPB) as an anion discriminator, dibutyl butylphosphonate (DBBP) as plasticizer in PVC matrix in the percentage ratio 5.0:2.5:200:200 (II:NaTPB:DBBP:PVC)(w/w) exhibits a linear response to Ni2+ in the concentration range 7.0×10-6- 1.0×10-1M with a slope of 29.8±0.2 mV/decade of activity and a fast response time of 12s. The sensor works well in the pH range 2.0-7.6 and can be satisfactorily used in presence of 40% (v/v) methanol, ethanol or acetone. The sensor is highly selective for Ni2+ over a large number of mono-, biand trivalent cations. The sensor has been successfully used as indicator electrode in the potentiometric titration of Ni2+ against EDTA. These electrodes can be used to determine the concentration of Ni2+ in real samples. Full article
(This article belongs to the Special Issue Ion Sensors)
Open AccessArticle Sensor for Silver(I) Ion Based on Schiff-base-p-tertbutylcalix[4]arene
Sensors 2002, 2(10), 417-423; doi:10.3390/s21000417
Received: 16 September 2002 / Accepted: 1 October 2002 / Published: 18 October 2002
Cited by 25 | PDF Full-text (69 KB) | HTML Full-text | XML Full-text
Abstract
The preparation of polymer membrane selective to silver ion and its application to ion-selective electrode is reported here. PVC membrane contain silver-selective calix[4]arene derivative as ionophore. The membrane electrode is highly selective to silver ion and exhibit good linear response over a wide
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The preparation of polymer membrane selective to silver ion and its application to ion-selective electrode is reported here. PVC membrane contain silver-selective calix[4]arene derivative as ionophore. The membrane electrode is highly selective to silver ion and exhibit good linear response over a wide concentration range of 1.0×10-1 to 1.0×10-5M AgNO3 with Nernstian slope of 58.9 mV per decade. The detection limit of electrode is 6.31×10-6 M .The calix[4]arene based membrane electrode exhibit enhanced selectivities for silver ion over other cations; log KPotAg,Na = -2.35, log KPotAg,K= -2.65, log KPotAg,Mg = -4.57, log KPotAg,Ba = -4.10, log KPotAg,Cd = -3.42, log KPotAg,Pb = -3.45.Even the strongest interferent Hg2+ do not interfere to great extent, log KPotAg,Hg = -2.0.The electrode response is stable over wide pH range of 1.0-6.0. The response time of the sensor is 30 seconds and the membrane can be used for more than 6 months without observing any divergence. The sensor can also be applied as an indicator electrode for potentiometric titration of Ag+ ions with Cl-. It is possible to determine Ag(I) in the natural water spiked with silver with this electrode assembly. Full article
(This article belongs to the Special Issue Ion Sensors)
Open AccessArticle Ion Selective PVC Membrane Electrode for the Determination of Methacycline Hydrochloride in Pharmaceutical Formulation
Sensors 2002, 2(10), 424-431; doi:10.3390/s21000424
Received: 10 May 2002 / Accepted: 15 May 2002 / Published: 18 October 2002
Cited by 6 | PDF Full-text (85 KB) | HTML Full-text | XML Full-text
Abstract
A plastic membrane electrode for the determination of methacycline hydrochloride was fabricated based on the use of methacycline-tetraphenylborate as the electroactive substance, and dioctylphtalate as the plasticizing agent. It was found that the potential responses of the electrode were influenced by pH of
[...] Read more.
A plastic membrane electrode for the determination of methacycline hydrochloride was fabricated based on the use of methacycline-tetraphenylborate as the electroactive substance, and dioctylphtalate as the plasticizing agent. It was found that the potential responses of the electrode were influenced by pH of the tested solution when pH>3. Under the condition of pH 2.6, the linear response range, slope (25ºC) and detection limit obtained were 3.0×10-2~6.0×10-6M, 52.9mv per decade and 3.4×10-6M ,respectively. The response time of the electrodes was <15 seconds. The values of recovery obtained were 99.2~101.2%. The electrode was successfully applied to determination of methacycline hydrochloride in tablet by direct potentiometric method. The result obtained with the electrode was in good agreement with the value obtained by using the official method (highperformance liquid chromatography). Full article
(This article belongs to the Special Issue Ion Sensors)
Open AccessArticle Reagents for Lithium Electrodes and Sensors for Blood Serum Analysis
Sensors 2002, 2(10), 432-435; doi:10.3390/s21000432
Received: 17 April 2002 / Accepted: 25 April 2002 / Published: 18 October 2002
Cited by 13 | PDF Full-text (38 KB)
Abstract
The measurement of lithium in blood serum requires high selectivity since the blood contains about 140 mM sodium compared to the 0.5-1.5 mM lithium level in manic depressive patients under treatment with lithium salts. This review traces the development of optical and potentiometric
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The measurement of lithium in blood serum requires high selectivity since the blood contains about 140 mM sodium compared to the 0.5-1.5 mM lithium level in manic depressive patients under treatment with lithium salts. This review traces the development of optical and potentiometric methods for the selective measurement of lithium in the presence of sodium. Selectivities of over 1,000:1 are achievable with properly designed ionophores. Full article
(This article belongs to the Special Issue Ion Sensors)

Review

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Open AccessReview Calixarene-Based Molecules for Cation Recognition
Sensors 2002, 2(10), 397-416; doi:10.3390/s21000397
Received: 24 September 2002 / Accepted: 1 October 2002 / Published: 11 October 2002
Cited by 83 | PDF Full-text (255 KB)
Abstract This review discusses molecular design principles of calixarene-type macrocycles for ion recognition and gives examples on the relationship between structure and selectivity, however without attempting to cover all the different approaches. Full article
(This article belongs to the Special Issue Ion Sensors)

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