Abstract:N,N'-bis(2-piridinacarboxamida)-1,2-benzeno (H 2 BPB) apresentou um comportamento seletivo e sensível, frente ao íon Ho(III), em comparação a um grande número de íons de metais de transição interna, representativos e de lantanídeos, tendo sido portanto, aplicado como um ionóforo neutro para preparação de uma membrana sensora Ho(III), com alta seletividade e sensitividade. As membranas também contêm tetraquis(p-clorofenil) borato de potássio (KTpClPB) como um aditivo aniônico, e foram testadas pelo uso de difer… Show more
“…The obtained selectivity coefficients revealed that these cations cannot disturb the function of the proposed Ho 3+ membrane sensor. Table 3 compared the detection limit, concentration range, response time, and selectivity coefficients for previously reported and proposed sensor [12][13][14][15][16][17]. As seen, the proposed membrane sensor based on H 2 Me 2 bpb shows superior selectivity to the previous reported ones.…”
Section: Determination Of the Selectivity Coefficientmentioning
confidence: 86%
“…Ionophores in references [13] and [14] cannot form a wrapped around complex. The ionophore used in references [15][16][17], are form a family. They are derivatives of symmetric picolinamide.…”
Section: Determination Of the Selectivity Coefficientmentioning
confidence: 99%
“…Although there are a few reports on holmium potentiometric sensors [12][13][14][15][16][17], there is a need to find more selective ionophores which can form a selective complex with one of the lanthanides more than others. In this work, N-(4,5-dimethyl-2-(picolinamido)phenyl)picolinamide (H 2 Me 2 bpb) ( Fig.…”
“…The obtained selectivity coefficients revealed that these cations cannot disturb the function of the proposed Ho 3+ membrane sensor. Table 3 compared the detection limit, concentration range, response time, and selectivity coefficients for previously reported and proposed sensor [12][13][14][15][16][17]. As seen, the proposed membrane sensor based on H 2 Me 2 bpb shows superior selectivity to the previous reported ones.…”
Section: Determination Of the Selectivity Coefficientmentioning
confidence: 86%
“…Ionophores in references [13] and [14] cannot form a wrapped around complex. The ionophore used in references [15][16][17], are form a family. They are derivatives of symmetric picolinamide.…”
Section: Determination Of the Selectivity Coefficientmentioning
confidence: 99%
“…Although there are a few reports on holmium potentiometric sensors [12][13][14][15][16][17], there is a need to find more selective ionophores which can form a selective complex with one of the lanthanides more than others. In this work, N-(4,5-dimethyl-2-(picolinamido)phenyl)picolinamide (H 2 Me 2 bpb) ( Fig.…”
“…Other sensors include Eu 3+ [171,172], Gd 3+ [173][174][175][176], Tb 3+ [177,178], Dy 3+ [179,180], Ho 3+ [181,182], Er 3+ [183], Tm 3+ [184,185], Yb 3+ [186][187][188] PMEs, in addition to one Lu 3+ PME [189] and two uranyl PMEs and GCE [190,191]. The minimum detection limit among all of these sensors is reported to be 7.0 × 10 -8 for uranyl ion [191], which is a 2,2'- …”
This review presents a general overview about the development of ion-selective electrodes in Iran during the past decade (1996)(1997)(1998)(1999)(2000)(2001)(2002)(2003)(2004)(2005)(2006). All of the reported ion-selective sensors (for cations, anions and organic species) are cited in this review. Sensors for 39 cations, 12 anions, and 23 organic compounds and drugs have been reported in this reivew. Some of the main group cations (e.g. beryllium) as well as most of the lanthanide ion (i.e., presidium, erbium, lutetium, cerium, neodymium, europium, gadolinium, terbium, dysprosium, holmium, ytterbium, and thulium) sensors have been reported for the first time. It is noticable that the best reported sensors for HPO 4 2-, SO 4 2-, Cl -, ClO 4 -, Br -, and I 3 -have been designed and constructed by the Iranian researchers.
“…The potentiometric sensors based on ion-selective electrode are the best analytical method for such determination because they offer advantages such as selectivity, sensitivity, low detection limit, simplicity and low cost. [12][13][14][15][16][17][18][19][20][21][22][23][24] A literature survey reveled that few sensors [24][25][26][27][28][29][30][31] have been reported to determine Ho 3+ concentration, but they have low detection limit, narrow concentration range and interference from other ions. Thus, a quick, convenient, fast method is required to determine Ho 3+ in large number of environmental samples.…”
The two chelates based on calix [4]arene and thiacalix [4]arene have been synthesized and used as neutral ionophores for preparing PVC based membrane sensor selective to Ho 3+ ion. The addition of potassium tetrakis(4-chlorophenyl)borate (KTpClPB) and various plasticizers, viz., NDPE, o-NPOE, DOP, TEP and DOS have been found to improve significantly the performance of the sensors. The best performance was obtained with the sensor no. 6 having membrane of L 2 with composition (w/w) ionophore (2%): KTpClPB (4%): PVC (37%): NDPE (57%). This sensor exhibits Nernatian response with slope 21.10 ± 0.3 mV/decade of activity in the concentration range 3.0 × 10 −8 -1.0 × 10 −2 M Ho 3+ ion, with a detection limit of 1.0 × 10 −8 M. The proposed sensor performs satisfactorily over a wide pH range of 2.8-10, with a fast response time (5 s). The sensor was also found to work successfully in partially non-aqueous media up to 25% (v/v) content of methanol, ethanol and acetonitrile, and can be used for a period of 4 months without any significant drift in potential. The electrode was also used for the determination of Ho 3+ ions in synthetic mixtures of different ions and the determination of the arsenate ion in different water samples.
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