Highly selective thiocyanate poly(vinyl chloride) membrane electrode based on a cadmium-Schiff's base complex

Ganjali, Mohammad Reza; Poursaberi, Tahereh; Basiripour, Fatemeh; Salavati-Niassari, Masoud; Yousefi, Mohammad; Shamsipur, Mojtaba

doi:10.1007/s002160100915

Cited by 92 publications

(37 citation statements)

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“…The limit of detection was 4×10 -8 mol/L. The limit of detection is better than for some reported electrodes [13] and is several orders of magnitude lower than the thiocyanate concentration in biological samples [8]. Thus, this modified electrode makes it possible to determine thiocyanate in practical samples.…”

Section: Introductionmentioning

confidence: 72%

“…Therefore, the determination of the SCN -concentration at low levels is important. Several SCN --selective electrodes, based on a variety of carriers such as organometallic compounds and metalloporphyrin derivatives, have been reported over the past years [9][10][11][12][13]. Because some of these are complicated, laborious to perform, require toxic reagents, etc.…”

Section: Introductionmentioning

confidence: 99%

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Amperometric Sensor Used for Determination of Thiocyanate with a Silver Nanoparticles Modified Electrode

Wang

Gao

et al. 2004

Sensors

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Abstract:A novel electrode modified with silver nanoparticles was fabricated. It is found that the reducibility of silver nanoparticles is higher than for bulk silver by comparing a silver nanoparticles modified electrode with a silver micro-disk electrode. When SCN -was added, a new oxidation peak occurred and the anodic peak current of silver nanoparticles decreased. The new anodic peak current is proportional to the thiocyanate concentration in the range of 5.0×10 -7~4 .0×10 -4 mol/L in pH 6.0 NaH 2 PO 4 -Na 2 HPO 4 buffer solutions (PBS).The detection limit (S/N=3) is 4×10 -8 mol/L. This method has been applied to the determination of saliva (smoker and non-smoker).

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Section: Introductionmentioning

confidence: 72%

Section: Introductionmentioning

confidence: 99%

Amperometric Sensor Used for Determination of Thiocyanate with a Silver Nanoparticles Modified Electrode

Wang

Gao

et al. 2004

Sensors

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“…It is well understood that, the sensitivity and selectivity of the ion-selective electrodes depend not only on the nature of the ion-carrier used, but also significantly on the membrane composition and the properties of solvent mediators and additives used. [9][10][11][12][13][14] Thus, the influences of the membrane composition, nature of solvent mediator and additive on the response characteristics of the I − sensor were investigated, and the results are shown in Table 1 and Figure 3. As it is seen, among three different plasticizers used, the use of DBP resulted in the best response characteristics (no.…”

Section: Resultsmentioning

confidence: 99%

“…It is well known that the cationic additives improve the EMF response of the anion selective electrodes. [11][12][13][14][15] As it is obvious from Table 1, the presence of HTAB in the membrane composition (no. 4-9) increases the sensitivity of the sensors.…”

Section: Resultsmentioning

confidence: 99%

Titanium Acetylacetonate as an Excellent Ion-Carrier in Construction of Iodide Sensor

2003

Bulletin of the Korean Chemical Society

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Titanium acetylacetonate was used in the construction of a PVC-based membrane electrode. This sensor shows very good selectivity for iodide ion over a wide variety of common inorganic and organic anions. It exhibits Nernstian behavior with a slope of 59.1 mV per decade. The working concentration ranges of the sensor are 1.0 × 10 −1 -5.0 × 10 −6 M with a detection limit of 3.0 × 10 −6 M. The response time of the sensor is very fast (<8 s), and can be used for at least twelve weeks in the pH range of 4.0-9.2. The best performance was obtained with a membrane composition of 30% PVC, 65% dibutylphthalate, 3% titanium acetylacetonate and 2% hexadecyltrimethylammonium bromide. The proposed sensor was successfully applied as an indicator electrode for titration of iodide with silver ion.

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“…Pyrex tubes (5 mm i.d.) [30][31][32][33] were dipped into the mixtures for about 10 s, so that nontransparent membranes of about 0.3 mm thickness were formed. The tubes were then pulled out of the mixtures, and kept at room temperature for about 10 h. After this, the tubes were filled with the internal solution (1.0 × 10 -3 M NaNO2).…”

Section: Preparation Of the Electrodementioning

confidence: 99%

Highly Selective PVC-Membrane Electrodes Based on Co(II)-Salen for Determination of Nitrite Ion

2003

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Because of the important role of nitrite ion in producing toxic, carcinogenic and/or mutagenic N-nitrosamines in human body, on the one hand, 1 and its increasing use as a preservative in the food industry, on the other hand, 2,3 the determination of this anion in trace levels is of special interest.Besides a large number of analytical methodologies applicable to nitrite determination based on spectrophotometric, [4][5][6][7][8] chromatographic, 9-13 electrochemical, [14][15][16][17][18][19] 29 have also been reported in the literature. However, these nitrite ion-selective electrodes suffer from narrow linear ranges, high limits of detection and, especially, strong interference effects from such anionic species as perchlorate, thiocyanate and iodide.In this paper, we wish to report the use of the Co-Salen as an excellent ionophore for the preparation of a new highly selective and sensitive polymeric membrane electrode for nitrite ion. It is noteworthy, to the best of our knowledge, that this is the first time a Co(II) complex is used as an ionophore in constructing a NO2 -sensor. ExperimentalReagents Reagent grade acetophenon (AP), benzyl acetate (BA), dibutyl phthalate (DBP), o-nitrophenyloctyl ether (NPOE), hexadecyltrimethylammonium bromide (HTAB), tetrahydrofuran (THF) and high relative molecular weight PVC were purchased from Merck Chemical Company and used as received. Reagent grade sodium and potassium salts of all anions used (all from Merck) were of the highest purity available, and used without any further purification except for vacuum drying. Doubly distilled deionized water was used throughout. Synthesis of cobalt-Schiff's base complexA 0.06 mol portion of CoCl2 was dissolved in 50 cm 3 of methanol and 0.06 moles of the required ligand was dissolved in a minimum amount of acetone and added dropwise to the metal salt solution. The mixture was refrigerated overnight. The crude cobalt chelate (Fig. 1) was isolated by filtration, and purified by recrystallization from acetone. (Found: C, 80.7; H, 3.9; N, 7.8; Co, 16.6; Calc. For C16H14N2O2Co: C, 80.9; H, 4.1; N, 7.8; Co, 16.7%). Preparation of the electrodeThe general procedure to prepare the PVC membrane was to mix thoroughly 33 mg of powdered PVC, 3 -6 mg of ionophore CS, 2 -3 mg of cationic additive HTAB and 59 -62 mg of plasticizer (NPOE, NB, DBP, DOP, and BA). The mixtures were then dissolved in 3 ml of dry THF. The resulting clear mixtures were evaporated slowly until oily concentrated mixtures were obtained. Pyrex tubes (5 mm -ion concentration range (1.0 × 10 -6 -1.0 × 10 -1 M) and a very low detection limit (5.0 × 10 -7 M). The potentiometric response is independent of the pH of solution in the pH range 4.0 -9.5. The electrode shows advantages such as low resistance, fast response and, most importantly, good selectivity relative to a wide variety of inorganic and organic anions. In fact, the selectivity behavior of the proposed NO2 -ion-selective electrode shows great improvements compared to the previously reported electrodes for nitrite ion....

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Highly selective thiocyanate poly(vinyl chloride) membrane electrode based on a cadmium-Schiff's base complex

Cited by 92 publications

References 0 publications

Amperometric Sensor Used for Determination of Thiocyanate with a Silver Nanoparticles Modified Electrode

Amperometric Sensor Used for Determination of Thiocyanate with a Silver Nanoparticles Modified Electrode

Titanium Acetylacetonate as an Excellent Ion-Carrier in Construction of Iodide Sensor

Highly Selective PVC-Membrane Electrodes Based on Co(II)-Salen for Determination of Nitrite Ion

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