http://www.mdpi.com/journal/sensors/special_issues/ion_sensors/ {snippet name="submission_info"} http://www.mdpi.com/1424-8220/2/10/383/ n/a http://www.mdpi.com/1424-8220/2/10/383/ Thu, 31 Oct 2002 00:00:00 CET Sensors 2002-10-31 2 10 Editorial 383 383 1424-8220 Ion Sensors 2002-10-31 doi: 10.3390/editorial1 Milan M. Antonijevic http://www.mdpi.com/1424-8220/2/10/432/ 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. http://www.mdpi.com/1424-8220/2/10/432/ Fri, 18 Oct 2002 00:00:00 CEST Sensors 2002-10-18 2 10 Article 432 435 1424-8220 Reagents for Lithium Electrodes and Sensors for Blood Serum Analysis 2002-10-18 doi: 10.3390/s21000432 Gary D. Christian http://www.mdpi.com/1424-8220/2/10/424/ 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 http://www.mdpi.com/1424-8220/2/10/424/ Fri, 18 Oct 2002 00:00:00 CEST Sensors 2002-10-18 2 10 Article 424 431 1424-8220 Ion Selective PVC Membrane Electrode for the Determination of Methacycline Hydrochloride in Pharmaceutical Formulation 2002-10-18 doi: 10.3390/s21000424 Hassan Y. Aboul-Enein Xian Xiang Sun Cheng Jun Sun http://www.mdpi.com/1424-8220/2/10/417/ 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. http://www.mdpi.com/1424-8220/2/10/417/ Fri, 18 Oct 2002 00:00:00 CEST Sensors 2002-10-18 2 10 Article 417 423 1424-8220 Sensor for Silver(I) Ion Based on Schiff-base-p-tertbutylcalix[4]arene 2002-10-18 doi: 10.3390/s21000417 R. K. Mahajan Inderpreet Kaur V. Sharma M. Kumar http://www.mdpi.com/1424-8220/2/10/397/ 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. http://www.mdpi.com/1424-8220/2/10/397/ Fri, 11 Oct 2002 00:00:00 CEST Sensors 2002-10-11 2 10 Review 397 416 1424-8220 Calixarene-Based Molecules for Cation Recognition 2002-10-11 doi: 10.3390/s21000397 Rainer Ludwig Nguyen Thi Kim Dzung http://www.mdpi.com/1424-8220/2/10/384/ 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. http://www.mdpi.com/1424-8220/2/10/384/ Tue, 08 Oct 2002 00:00:00 CEST Sensors 2002-10-08 2 10 Article 384 396 1424-8220 Dibenzocyclamnickel(II) as Ionophore in PVC-Matrix for Ni2+-Selective Sensor 2002-10-08 doi: 10.3390/s21000384 Vinod K. Gupta Rajendra Prasad Azad Kumar