共查询到20条相似文献,搜索用时 31 毫秒
1.
Mojtaba Shamsipur Sohrab Ershad Naser Samadi Abloghasem Moghimi Hossein Aghabozorg 《Journal of Solid State Electrochemistry》2005,9(11):788-793
A new modified carbon paste electrode based on a recently synthesized mercury (II) complex of a pyridine containing proton
transfer compound as a suitable carrier for Br− ion is described. The electrode has a linear dynamic range between 3.00×10−2 and 1.0×10−5 M with a near-Nernastian slope of 61.0±0.9 mV per decade and a detection limit of 4.0×10−6 M (0.32 ppm). The potentiometric response is independent of the pH of the solution in the pH range 4.0–8.3. The electrode
possesses the advantages of low resistance, fast response and good over a variety of other anions. It was applied as an indicator
electrode in potentiometric titration of bromide ions and for the recovery of Br− from tap water. 相似文献
2.
Hassan Ali Zamani Mohammad Reza Ganjali Masoud Salavati-Niasari 《Transition Metal Chemistry》2008,33(8):995-1001
A Fe3+ ion-selective membrane sensor was fabricated from polyvinyl chloride (PVC) matrix membrane containing bis-bidentate Schiff
base (BBS) as a neutral carrier, sodium tetraphenyl borate (NaTPB) as anionic excluder, and o-nitrophenyloctyl ether (NPOE) as a plasticizing solvent mediator. The effects of the membrane composition, pH, and additive
anionic influence on the response properties were investigated. The best performance was obtained with a membrane containing
32% PVC, 62.5% NPOE, 3% BBS, and 2.5% NaTPB. The electrode shows a Nernstian behavior (slope of 19.3 ± 0.6) over a very wide
iron ion concentration range (1.0 × 10−7–1.0 × 10−2 M) and has a low detection limit (7.4 × 10−8 M). The potentiometric response of the sensor is independent of pH of the solution in the pH range 1.9–5.1. The proposed
sensor has a very low response time (<15 s) and a good selectivity relative to a wide variety of other metal ions including
common alkali, alkaline earth, heavy, and transition metal ions. The electrode can be used for at least 60 days without any
considerable divergence in potentials. The proposed sensor was successfully applied as an indicator electrode for the potentiometric
titration of 1.0 × 10−2 M Fe3+ ions with a 1.0 × 10−4 M EDTA and the direct determination of Fe3+ in mineral water and wastewater samples. 相似文献
3.
Y. Li Y. Chai R. Yuan W. Liang L. Zhang G. Ye 《Journal of Analytical Chemistry》2008,63(11):1090-1093
A PVC membrane electrode for Al3+ based on glyoxal-bis-thiosemicarbazone (GBTC) as an ion carrier was developed. The electrode exhibits a Nernstian slope of 20.1 mV per decade and a linear range of 1.8
× 10−5−1.0 × 10−1 M for Al(NO3)3 with a detection limit of 8.7 × 10−6 M. It has a fast response time of about 10 s and can be used for at least 1 month. The proposed membrane sensor revealed
a good selectivity for Al3+ over a wide variety of other metal ions and could be used in the pH range of 2.5–4.5.
The text was submitted by the authors in English. 相似文献
4.
M. R. Ganjali P. Norouzi S. Shirvani-Arani A. Kakanezhadifard 《Journal of Analytical Chemistry》2007,62(3):279-284
In this paper, a novel membrane triiodide sensor based on a charge-transfer complex of (1,3-diphenyldihydro-1H-imidazole)-4,5-dionedioxime
with iodine (CTCI) as a membrane carrier is introduced. The best performance was obtained with a membrane containing 30% polyvinylchloride
(PVC), 63% dibutylphthalate (DBP), 5% CTCI, and 2% hexadecyltrimethylammonium bromide (HTAB). The electrode shows a Nernstian
behavior (slope of 58.2 ± 0.3) over a very wide triiodide ion concentration range (5.0 × 10−8−1.0 × 10−2 M), and has a low detection limit (4.0 × 10−8 M). The potentiometric response of the sensor is independent of pH of the solution in the pH range 3.0–9.0. The proposed
sensor has a very low response time (<12 s) and a good selectivity relative to a wide variety of common inorganic and organic
anions, including iodide, bromide, chloride, nitrate, sulfate, thiocyanate, monohydrogen phosphate, and acetate. In fact,
the selectivity behavior of the proposed triiodide ion-selective electrode shows great improvements compared to the previously
reported electrodes for triiodide ion. The proposed membrane sensor can be used for at least 6 months without any divergence
in its potentials. The electrode was successfully applied as an indicator electrode in the titration of triiodide with thiosulfate
ion.
The text was submitted by the authors in English. 相似文献
5.
A new poly(vinyl chloride)-based membrane was fabricated with the cobalt(II) complex of 2,4-dimethyl-1,5,8,11-tetraazacyclotrideca-1,4-diene
[Me2(13)dieneN4] as an ion carrier. The membrane composition was Co2+ complex/PVC/NaTPB/DBP 15:50:15:20 (w/w). The sensor exhibited a Nernstian response for Co2+ ions over a wide concentration range (7.94×10−6–1.0×10−1 M) at pH 2.5–7.0, a response time of 10 s, and it could be used for 3 months without any significant divergence in potential.
The proposed membrane sensor exhibited good selectivity for Co2+ over a wide variety of other metal ions and in mixtures containing up to 25% (v/v) non-aqueous content. The sensor was successfully
used as an indicator electrode in the potentiometric titration of Co2+ with EDTA and the direct determination of Co2+ in real samples. 相似文献
6.
Conducting polymer poly(pyrrole) (PPy) doped with Nafion was successfully used as ion-to-electron transducer in the construction
of a solid-contact Pb2+-selective polymeric membrane electrode. The Nafion dopant can effectively increase the capacitance of the conducting polymer
and improve the mechanical robustness of the coating. The transducer layer, PPy-Nafion, characterized by cyclic voltammetry
and electrochemical impedance spectroscopy, exhibits a sufficiently high bulk (redox) capacitance and fast ion and electron
transport process. The new Pb2+-selective polymeric membrane electrode, based on PPy-Nafion film as solid contact, shows stable Nernstian characteristics
in Pb(NO3)2 solution within the concentration range of 1.0 × 10−7–1.0 × 10−3 M, and the detection limit is 4.3 × 10−8 M. The potential stability of the electrode and the influence of the interfacial water layer were also evaluated by chronopotentiometry
and potentiometric water layer test, respectively. The results show that the solid-contact Pb2+-selective electrode, based on PPy-Nafion film as ion-to-electron transducer, can effectively overcome the potential drift
and reduce the water layer between the PPy-Nafion transducer layer and the ion-selective membrane. 相似文献
7.
Magda M. Ayad Abdalla Shalaby Hisham E. Abdellatef Heba M. Elsaid 《Mikrochimica acta》2002,140(1-2):93-96
The construction of a plasticised PVC matrix-type promazinium cation-selective membrane electrode and its use in the potentiometric
determination of promazine hydrochloride in pharmaceutical preparations are described. It is based on the use of the ion-associate
species, formed by promazinium cation and tetraphenylborate (TPB) counter ion. The basic electrode performance characteristics
are evaluated according to IUPAC recommendations. It exhibited a linear response for 1 × 10−2−1 × 10−5 M of promazine hydrochloride solutions with a cationic Nernstian slope over the pH range 2–6. Common organic and inorganic
cations showed negligible interference. Direct potentiometric determination of 1 × 10−2−1 × 10−5 M aqueous promazine hydrochloride using this membrane electrode system showed an average recovery of 99.5% with a mean standard
deviation of 1.5%. This electrode was successfully used for monitoring the titration of promazine hydrochloride with sodium
tetraphenyl borate and for determining promazine hydrochloride in ampoules.
Received June 15, 2001 Revision November 6, 2001 相似文献
8.
M. Mazloum Ardakani P. Ebrahimi M. R. Mansournia 《Russian Journal of Electrochemistry》2008,44(9):1065-1072
A new salicylate-selective electrode based on the complex (2,3;6,7;10,11;14,15-tetraphenyl-4,9,13,16-tetraoxo-1,5,8,12-tetraazacyclohexadecane)
copper(II) [CuL] as the membrane carrier was developed. The electrode exhibits a good Nernstian slope of −60.9 ± 1.0 mV/decade
and a linear range from 1.0 × 10−6 to 1.0 × 10−1 M for salicylate. The detection limit is 5.0 × 10−7 M. The electrode has a fast response time (5–15 s) and can be used for more than three months. The selective coefficients
were determined by the fixed interference method (FIM) and separate solution method (SSM). The salicylate-selective electrode
could be used in the pH range 3.5–10.5. It was employed as an indicator electrode for direct determination of salicylate in
pharmaceutical samples.
Published in Russian in Elektrokhimiya, 2008, Vol. 44, No. 9, pp. 1147–1154.
The text was submitted by the authors in English. 相似文献
9.
The electrode characteristics and selectivities of PVC-based thiocyanate selective polymeric membrane electrode (PME) incorporating
the newly synthesized zinc complex of 6,7:14,15-Bzo2-10,11-(4-methylbenzene)-[15]-6,8,12,14-tetraene-9,12-N2-1,5-O2 (I
1
) and zinc complex of 6,7:14,15-Bzo2-10,11-(4-methylbenzene)-[15]-6,14-diene-9,12-dimethylacrylate-9,12-N2-1,5-O2 (I
2
) are reported here. The best response was observed with the membrane having a composition of I2:PVC:o-NPOE:HTAB in the ratio of 6:33:59:2 (w/w; milligram). This electrode exhibited Nernstian slope for thiocyanate ions over working concentration range of 4.4 × 10−7 to 1.0 × 10−2 mol L−1 with detection limit of 2.2 × 10−7 mol L−1. The performance of this electrode was compared with coated graphite electrode (CGE), which showed better response characteristics
w.r.t Nernstian slope 59.0 ± 0.2 mV decade−1 activity, wide concentration range of 8.9 × 10−8 to 1.0 × 10−2 mol L−1 and detection limit of 6.7 × 10−8 mol L−1. The response time for CGE and PME was found to be 8 and 10 s, respectively. The proposed electrode (CGE) was successfully
applied to direct determination of thiocyanate in biological and environmental samples and also as indicator electrode in
potentiometric titration of SCN− ion. 相似文献
10.
Zholt Kormosh Iryna Hunka Yaroslav Bazel Andriy Laganovsky Iryna Mazurenko Nataliya Kormosh 《Central European Journal of Chemistry》2007,5(3):813-823
The potentiometric response characteristics of a diclofenac selective electrode, based on ion association in different plasticizers,
were compared. The sensitivity, working range, detection limit and selectivity of membrane sensors demonstrated significant
dependence on the type of plasticizers. The potentiometric unit presented a linear response toward diclofenac concentrations
between 1 × 10−5 − 5 × 10−2 mol L−1, with slopes of approximately 60 mV dec−1, and exhibited a response time of 3 s. The potentiometric analysis of sodium diclofenac in pharmaceutical formulations was
perfomed by the membrane electrode proposed and compared with the results of potentiometric titration given by the Pharmacopoeia
of Ukraine.
相似文献
11.
M. R. Ganjali P. Norouzi R. Dinarvand F. Faribod A. Moghimi 《Journal of Analytical Chemistry》2008,63(7):684-689
In this work, for the first time, we introduce a highly selective and sensitive Be(II) microsensor. 4-nitrobenzo-9-crown-3-ether
(NBCE) was used as a membrane-active component to prepare a Be(II)-selective polymeric membrane microelectrode. The electrode
exhibits a Nernstian response toward Be(II) ions over a very wide concentration range (1.0 × 10−4–1.0 × 10−10 M), with a detection limit of 3.5 × 10−11 M (∼350 pg/L). In fact, the electrode presents a fast response time in the whole concentration range (6 s). The proposed
microelectrode can be used for at least six weeks without any considerable divergence in the potentials. The proposed membrane
sensor revealed a selectivity toward Be(II) ions over a wide variety of other metal ions including common alkali, alkaline-earth,
and rare-earth ions. It could be used in the pH range of 3.0–11.5. The microelectrode was successfully used as an indicator
electrode for the titration of 20 mL of 1.0 × 10−6 M Be2+ solution with 1.0 × 10−4 M of EDTA. It was also applied to the direct determination of beryllium ions in beryl and binary mixtures.
The text was submitted by the authors in English. 相似文献
12.
Ahmad Soleymanpour Bahram Garaili S. Masoud Nabavizadeh 《Monatshefte für Chemie / Chemical Monthly》2008,139(12):1439-1445
Three platinum(II) complexes were synthesized and studied to characterize their ability as an anion carrier in a PVC membrane electrode. The polymeric membrane electrodes (PME) and also coated glassy carbon electrodes (CGCE) prepared with
one of these complexes showed excellent response characteristics to perchlorate ions. The electrodes exhibited Nernstian responses to ClO4
− ions over a wide concentration range from 1.5 × 10−6 to 2.7 × 10−1 M for PME and 5.0 × 10−7 to 1.9 × 10−1 M for CGCE with low detection limits (9.0 × 10−7 M for PME and 4.0 × 10−7 M for CGCE). The electrodes possess fast response time, satisfactory reproducibility, appropriate lifetime and, most importantly,
good selectivity toward ClO4
− relative to a variety of other common anions. The potentiometric response of the electrodes is independent of the pH of the test solution in the pH range 2.0–9.0. The proposed sensors were used in potentiometric determination of perchlorate ions in mineral water and urine
samples.
Correspondence: Ahmad Soleymanpour, Department of Chemistry, Damghan Basic Science University, Damghan, Iran. 相似文献
13.
A polystyrene-based membrane of 7,8:16,17-dibenzo-6,9,15,18-tetraoxo-1,5,10,14-tetrathiacyclooctadeca-7,16-diene [Bz2Oxo4(18)dieneS4] was fabricated using sodium tetraphenylborate (NaTPB) and dioctyl phthalate (DOP) as anion excluder and plasticizing agent.
The best performance was obtained from the membrane with the composition ionophore [Bz2Oxo4(18)dieneS4]:polystyrene:DOP:NaTPB, 5:100:150:10 (w/w). The response of the electrode was linear over a wide range of concentration, 1.26×10–6–1.00×10–1 mol L−1 for silver ion with a Nernstian slope of 58.4±0.1 mV per decade and a detection limit of 1.0×10−6 mol L−1. The electrode was found to be chemically inert and of adequate stability with a response time of 10 s and could be used
for a period of 3 months without change of potential. It worked satisfactorily in mixtures containing up to 35% (v/v) non-aqueous content. The proposed membrane sensor had good selectivity for Ag+ over a wide variety of metal ions in the pH range 2.2–8.5. It was successfully used as an indicator electrode in potentiometric
titration of silver ion. The electrode was also useful for determination of Ag+ in waste from photographic films. 相似文献
14.
《Electroanalysis》2003,15(12):1038-1042
A novel gadolinium ion‐selective electrode based on the antibiotic omeprazole as membrane carrier was prepared. The electrode has a linear dynamic range between 1.0×10?1 and 1.0×10?5 M, with a Nernstian slope of 19.3 ± 0.3 mV decade?1 and a detection limit of 5.0×10?6 M. The potentiometric response is independent of the pH of the solution in the pH range 4.0–10.0. The electrode possesses the advantages of short conditioning time, fast response time and especially, very good selectivity over a large number of other cations. The electrode can be used for at least 2 months without any considerable divergence in potentials. It was used as an indicator electrode in potentiometric titration of Gd(III) ions with EDTA. 相似文献
15.
Heterocyclic thiocarboxylic acids have been designed to prepare polymeric membrane ion-selective electrode (ISE) for Pb2+. Construction, response characteristic and application of the lead ISEs are investigated. Better results have been obtained
with membranes containing ligands L1∼L3 with bis(2-ethylhexyl) sebacate (DOS) as a plasticizer. Ionophores L1∼L3 are [(4,6-dimethyl-2-pyrimidinyl) thio] acetic acid (L1), (1,3,4-thiadiazole-2,5-diyldithio) diacetic acid (L2) and (1,3,4-thiadiazole-2,5-diyldithio) dipropionic acid (L3). The optimum electrodes have the composition of L1 (1.6): PVC (32.7): DOS (65.3): KT
p
ClPB (0.4) (w/w), L2 (1.0): PVC (32.8): DOS (66.0): KT
p
ClPB (0.2) (w/w), and L3 (1.0): PVC (32.7): DOS (65.4): KT
p
ClPB (0.9) (w/w). The optimized membrane electrodes work well over a wide range of concentrations (1.0 × 10−5 ∼1.0 × 10−2 M, 1.0 × 10−6 ∼1.0 × 10−2 M, and 1.0 × 10−6 ∼1.0 × 10−2 M) with the response slope of 27.4, 30.1 and 29.2 mV/decade, respectively. Potentiometric selectivities of the ISEs based
on L1 ∼ L3 for Pb2+ over other interfering ions are determined with the fix interference method. The electrodes display good selectivity over
a number of alkali, alkaline earth, transition and heavy metal ions. The lifetime of the electrodes is about 2 months and
their response time is 20 s. Applications of these electrodes for the determination of lead in real samples and as indicator
electrodes for potentiometric titration of Na2SO4 using Pb2+ solution are reported. 相似文献
16.
A novel lidocaine ion-selective electrode is prepared, characterized and used in pharmaceutical analysis. The electrode incorporates
PVC-membrane with lidocaine-sulfathiazole ion pair complex. The influences of membrane composition, temperature, pH of the
test solution, and foreign ions on the electrode performance were investigated. The electrode showed a Nernstian response
over a lidocaine concentration range from 1.0 ×10−5 to 1.0 × 10−1 mol L−1 with a slope of 60.1 ± 0.2 mV per decade at 25°C and was found to be very selective, precise, and usable within the pH range
5–9.5. The standard electrode potentials, E
o, were determined at 10, 15, 20, 25, 30, 35 and 40°C, and used to calculate the isothermal temperature coefficient (dE
o/dT=−0.0003 V °C−1) of the electrode. However, the electrode performance is significantly decreased at temperatures higher than 45°C. The electrode
was successfully used for potentiometric determination of lidocaine hydrochloride in pharmaceutical products.
The article is published in the original. 相似文献
17.
H. A. Zamani G. Rajabzadeh A. Firouz M. R. Ganjali 《Journal of Analytical Chemistry》2007,62(11):1080-1087
A PVC membrane containing 4-amino-6-methyl-1,2,4-triazin-3,5-dithione (AMTD) as a suitable ionophore, exhibits a Nernstian
response for Cu2+ ions over a wide concentration range up to 1 × 10−1 and 1 × 10−6 M, with a detection limit of 7.5 × 10−7 M in the pH range 3.0–7.5. It has a fast response time (<15 s) and can be used for at least 12 weeks without any major deviation
in the potential. The electrode revealed a very good selectivity with respect to all common alkali, alkaline-earth, transition,
and heavy-metal ions. It was successfully applied to the recovery of copper ions from wastewater. The electrode was also used
as an indicator electrode in the potentiometric titration of Cu(II) ions with EDTA.
The text was submitted by the authors in English. 相似文献
18.
M. Soledad García Joaquín Ortuño M. Isabel Albero María Cuartero 《Analytical and bioanalytical chemistry》2009,394(6):1563-1567
A trazodone-selective electrode for application in pharmaceutical quality control and urine analysis was developed. The electrode
is based on incorporation of a trazodone-tetraphenylborate ion exchanger in a poly(vinyl chloride) membrane. The electrode
showed a fast, stable and Nernstian response over a wide trazodone concentration range (5 × 10−5−1 × 10−2 M) with a mean slope of 59.3 ± 0.9 mV/dec of concentration, a mean detection limit of 1.8 × 10−5 ± 2.2 × 10−6 M, a wide working pH range (5–7.5) and a fast response time (less than 20 s). The electrode also showed good accuracy, repeatability,
reproducibility and selectivity with respect to some inorganic and organic compounds, including the main trazodone metabolite.
The electrode provided good analytical results in the determination of trazodone in pharmaceuticals and spiked urine samples;
no extraction steps were necessary. Dissolution testing of trazodone tablets, in different conditions of pH and particle size,
based on a direct potentiometric determination with the new selective electrode is presented as well. 相似文献
19.
Raúl A. Sánchez-Moreno M. Jesús Gismera M. Teresa Sevilla Jesús R. Procopio 《Analytical and bioanalytical chemistry》2010,397(1):331-338
A disposable screen-printed electrode was designed and evaluated for direct detection of chromium(VI) in batch and flow analysis.
The carbon screen-printed electrode was modified with a graphite–epoxy composite. The optimal graphite–epoxy matrix contains
37.5% graphite powder, 12.5% diphenylcarbohydrazide, a selective compound for chromium(VI), and 50% epoxy resin. The principal
analytical parameters of the potentiometric response in batch and flow analysis were optimized and calculated. The screen-printed
sensor exhibits a response time of 20 ± 1 s. In flow analysis, the analytical frequency of sampling is 70 injections per hour
using 0.1 M NaNO3 solution at pH 3 as the carrier, a flow rate of 2.5 mL·min−1, and an injection sample volume of 0.50 mL. The sensor shows potentiometric responses that are very selective for chromium(VI)
ions and optimal detection limits in both static mode (2.1 × 10−7 M) and online analysis (9.4 × 10−7 M). The disposable potentiometric sensor was employed to determine toxicity levels of chromium(VI) in mineral, tap, and river
waters by flow-injection potentiometry and batch potentiometry. Chromium(VI) determination was also carried out with successful
results in leachates from municipal solid waste landfills. 相似文献
20.
Oxytetracycline hydrochloride-selective electrodes of both the coated wire and the conventional polymer membrane types based
on oxytetracyclinium phosphotungstate and phosphomolybdate have been prepared. A Nernstian response is shown by these electrodes
within 1.0×10−6–1.0×10−2 M concentration ranges depending on the type of electrode. The response is unaffected by the change of pH over the range
4–11. The standard electrode potentials, E°, were determined at different temperatures and used to calculate the isothermal
temperature coefficients of the electrodes. The electrodes show good selectivity to oxytetracycline hydrochloride with respect
to many inorganic cations, sugars and amino-acids. Oxytetracycline hydrochloride is determined successfully in pure solutions
and in pharmaceutical preparations using calibration by standard addition and potentiometric titration. A regeneration process
for the exhausted electrodes has been developed.
Received February 2, 2000. Revision April 7, 2000. 相似文献