Natural monocrystalline pyrite as a sensor in non-aqueous solutionPart I: Potentiometric titration of weak acids in, N,N-dimethylformamide, methylpyrrolidone and pyridine

Mihajlović, Lj. V.; Mihajlović, R.; Antonijević, Milan M.; Vukanovic, B. V.

doi:10.1016/j.talanta.2004.03.061

Cited by 11 publications

(2 citation statements)

References 37 publications

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“…The apparatus used for following the potential changes at the investigated electrode over the time, for the determination response time, selectivity and reversibility is already described in an earlier paper 34. The same apparatus was used to follow the changes of the electrode potential during titration process and the end point (TEP).…”

Section: Methodsmentioning

confidence: 99%

TiO₂‐modified Carbon Paste Electrode as a Sensor for the Assay of Weak Organic Acids/Bases and Complex Matrix Samples

Simić

Stanić

2015

Electroanalysis

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The construction, general performance characteristics and analytical application of a titanium dioxide–modified carbon paste electrode sensitive to hydrogen ions, based on incorporation of titanium dioxide in a carbon paste matrix, is described. The proposed electrochemical sensor exhibits a linear response in the pH range from 2 to 10, at 25 °C, with a sub‐Nernstian slope. The value of a slope is in a direct correlation with the electrode composition – the optimum content of a titanium dioxide in carbon paste is 30 %. Titanium dioxide‐modified carbon paste electrode shows fast response time and reproducibility, confirmed by different compounds determination in both, individual and complex material, namely, in synthetic and real samples. Besides, the electrode shows high selectivity in the presence of the alkali and the alkaline earth ions as Na+, K+, Ca2+ or Mg2+. The standard deviation of the investigated acids (acetic, oxalic, 5‐sulfosalicylic, p‐toluensulfonic acid, and amino acid‐glycine) and bases (N,N′‐diphenylguanidine and collidine) is less than 1.3 %. The obtained data are compared with those obtained by using a conventional glass pH‐electrode under the same experimental conditions and indicate a high correlation between them.

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Section: Methodsmentioning

confidence: 99%

TiO₂‐modified Carbon Paste Electrode as a Sensor for the Assay of Weak Organic Acids/Bases and Complex Matrix Samples

Simić

Stanić

2015

Electroanalysis

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“…While developing alternative possibilities for the H + ions determination during acid-base titrations, many authors investigated applications of a metal and metalloid electrodes, 14,15 metal oxide electrodes, [16][17][18] monocrystalline sulphide electrodes. [19][20][21][22] Sulphide minerals (pyrite, chalcopyrite and galena) have been investigated as indicator electrodes for acid-base 23,24 and redox titration in some non-aqueous solvents. The anodic dissolution process of chalcopyrite using various auxiliary analytical methods for the identification of the reaction products 25,26 and the cathodic reduction of chalcopyrite 27 have been investigated by different authors.…”

Section: Introductionmentioning

confidence: 99%

Application of Pyrite and Chalcopyrite Electrodes for the Acid-Base Determinations in Nitriles

Simi¹,

Stani²,

Antonijevi³

2011

J. Braz. Chem. Soc.

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Os minerais naturais pirita e chalcopirita tem sido usados como sensores em eletrodos indicadores usando acetronitrila e propionitrila como solventes. Os resultados mostram vantagens excepcionais da pirita e chacopirita como sensores eletroquímicos e também a possibilidade de aplicação desses eletrodos para determinações em solventes não aquosos onde eletrodos de vidro mostram dificuldades. O comportamento dos eletrodos indicadores de pirita e chalcopirita em nitrila foi avaliado pela titulação de diversas bases e ácidos de forças diferentes usando prótons e íons liato gerados pela oxidação de alguns ésteres de ácido gálico e fenóis diidróxi, bem como m-cresol e 3-metóxifenol. Os resultados obtidos com esses eletrodos foram comparados com os de eletrodos de vidro nas mesmas condições, obtendo-se boa concordância, reprodutividade e precisão. Os desvios padrão na determinação dos ácidos e bases investigados foram menores do que 0,9%. Em titulações potenciométricas com pirita e chalcopirita como eletrodos indicadores, o potencial é instantaneamente estabelecido. Ambos os eletrodos podem ser usados sem qualquer limitação temporal ou divergências potenciais consideráveis.The natural minerals pyrite and chalcopyrite have been used as the indicator electrode sensors using acetonitrile and propionitrile as solvents. The results show the exceptional advantage of pyrite and chalcopyrite as electrochemical sensors and also the possibility of the application of these electrodes for the determination in nonaqueous solutions where glass electrode shows many defaults. The behaviour of the pyrite and chalcopyrite indicator electrodes in nitriles were checked by titrating several bases and acids of different strengths using protons and lyate ions generated by the oxidation of some gallic acid esters and dihydroxy phenols, as well as m-cresol and 3-metoxy phenol. The results obtained by using these electrodes were compared with those obtained by the application of a glass electrode under the same conditions, and good agreement, reproducibility and accuracy were obtained. The standard deviation of the determination of the investigated acids and bases was less than 0.9%. In the potentiometric titrations with pyrite and chalcopyrite indicator electrodes, the potential is instantaneously established throughout. Both electrodes can be used without any time limit or without considerable divergence in potentials.

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Electrochemical anion sensing using electrodes chemically modified with Au(I)–Cu(I) heterotrimetallic alkynyl cluster complexes containing ferrocenyl groups

et al. 2010

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A novel family of electrochemical anion sensors operating in aqueous media, based on the heterometallic Au(I)-Cu(I) [{Au(3)Cu(2)(C(2)R)(6)}Au(3)(PPh(2)C(6)H(4)PPh(2))(3)](PF(6))(2) (L1, R = Fc; L2, R = C(6)H(4)Fc) alkynyl cluster complexes, is presented. Upon attachment to graphite and gold electrodes, these compounds exhibit a well-defined, essentially reversible, solid-state electrochemistry in contact with aqueous media, based on ferrocenyl-centered oxidation processes involving anion insertion, leading to distinctive pH-independent electrochemical responses for fluoride, chloride, bromide, perchlorate, bicarbonate, carbonate, phosphate, hydrogen phosphate, dihydrogen phosphate, and nitrate anions. Cluster-modified electrodes can be used as potentiometric sensors as a result of the reversible, diffusion-controlled electrochemistry obtained for the anion-assisted electrochemical oxidation of L1 and L2.

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Natural monocrystalline pyrite as a sensor in non-aqueous solutionPart I: Potentiometric titration of weak acids in, N,N-dimethylformamide, methylpyrrolidone and pyridine

Cited by 11 publications

References 37 publications

TiO₂‐modified Carbon Paste Electrode as a Sensor for the Assay of Weak Organic Acids/Bases and Complex Matrix Samples

TiO₂‐modified Carbon Paste Electrode as a Sensor for the Assay of Weak Organic Acids/Bases and Complex Matrix Samples

Application of Pyrite and Chalcopyrite Electrodes for the Acid-Base Determinations in Nitriles

Electrochemical anion sensing using electrodes chemically modified with Au(I)–Cu(I) heterotrimetallic alkynyl cluster complexes containing ferrocenyl groups

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Natural monocrystalline pyrite as a sensor in non-aqueous solutionPart I: Potentiometric titration of weak acids in, N,N-dimethylformamide, methylpyrrolidone and pyridine

Cited by 11 publications

References 37 publications

TiO2‐modified Carbon Paste Electrode as a Sensor for the Assay of Weak Organic Acids/Bases and Complex Matrix Samples

TiO2‐modified Carbon Paste Electrode as a Sensor for the Assay of Weak Organic Acids/Bases and Complex Matrix Samples

Application of Pyrite and Chalcopyrite Electrodes for the Acid-Base Determinations in Nitriles

Electrochemical anion sensing using electrodes chemically modified with Au(I)–Cu(I) heterotrimetallic alkynyl cluster complexes containing ferrocenyl groups

Contact Info

Product

Resources

About

TiO₂‐modified Carbon Paste Electrode as a Sensor for the Assay of Weak Organic Acids/Bases and Complex Matrix Samples

TiO₂‐modified Carbon Paste Electrode as a Sensor for the Assay of Weak Organic Acids/Bases and Complex Matrix Samples