A new solid state molybdenum-selective electrode has been developed. The electrode is composed of 20% MoS2, 60% Ag2S, and 20% Cu2S. An analytically useful potential change occurred, from 1 × 10-5 to 1 × 10-1 M molybdenum ion. The slope of the linear portion (1 × 10-1 - 1 × 10-5 M) was about 45 ± 2 mV/10-fold concentration changes in molybdenum. It was found that pH change between 1 and 12 had no effect on the potential of the electrode. There was no interference of most common cations such as K+, Na+, Ca2+, Mg2+, Cu2+ and Fe3+ anions such as Cl-, ,？ and . The lifetime of the electrode was more than 2 years, when used at least 4 - 5 times a day, and the response time was about 30 s. This electrode has been used for the determination of molybdenum ion in wine using standard addition method. The validation of the electrode has been made with a commercial molybdenum DP polarography and high consistency was obtained.
References
[1]
Kataoka, M., Nishimura, K. and Kambaral, T. (1983) Catalytic Determination of Molybdenum(VI) by Means of an Iodide Ion-Selective Electrode and a Landolt-Type Hydrogen Peroxide-Iodide Reaction. Talanta, 30, 941-944. https://doi.org/10.1016/0039-9140(83)80217-3
[2]
Altinata, A. and Pekin, B. (1973) Determination of Molybdenum and Tungsten with Iodide Activity Electrode. Analytical Letters, 6, 667-673. https://doi.org/10.1080/00032717308058719
[3]
Ganjalia, M.R., Norouzia, P., Ghomib, M. and Salavati-Niasaric, M. (2006) Highly Selective and Sensitive Monohydrogen Phosphate Membrane Sensor Based on Molybdenum Acetylacetonate. Analytica Chimica Acta, 267, 196-201. https://doi.org/10.1016/j.aca.2006.03.026
[4]
ShukUlrich, P. and Greenblatt, G.M. (2002) Ion-Selective Sensors Based on Molybdenum Bronzes. Journal of Solid State Electrochemistry, 6, 374-383. https://doi.org/10.1007/s100080100249
[5]
Ghanei-Motlagh, M., Taher, M.A., Ahmadi, K. and Sheikhshoaie, I. (2011) Iodide Selective Membrane Electrodes Based on a Molybdenum-Salenas a Neutral Carrier. Materials Science and Engineering: C, 31, 1625-1631. https://doi.org/10.1016/j.msec.2011.06.006
[6]
Zeng, X., Yu, S., Yuan, Q. and Qin, W. (2016) Solid-Contact K+-Selective Electrode Based on Three-Dimensional Molybdenum Sulfide Nanoflowers as Ion-to-Electron Transducer. Sensors and Actuators B: Chemical, 234, 80-83. https://doi.org/10.1016/j.snb.2016.04.153
[7]
Ekmekçi, G. and Somer, G. (1999) Preparation and Properties of Solid State Selenite Ion Selective Electrodes and Their Applications. Talanta, 49, 91-98. https://doi.org/10.1016/S0039-9140(98)00350-6
[8]
Ekmekçi, G., Kalayci, S. and Somer, G. (2004) A Solid-State Hydroxide Ion Selective Electrode for the Measurement of High pH Values. Sensors and Actuators: B, 101, 260-264. https://doi.org/10.1016/j.snb.2004.03.012
[9]
Somer, G., Kalayci, S. and Basak, I. (2010) Preparation of a New Solid State Fluoride Ion Selective Electrode and Application. Talanta, 80, 1129-1132. https://doi.org/10.1016/j.talanta.2009.08.037
[10]
Somer, G., Kalayci, S., Dogan, M. and Sendil, O. (2011) Preparation and Properties of a New Solid State Borate Ion Selective Electrode and Its Application. Talanta, 85, 1461-1465. https://doi.org/10.1016/j.talanta.2011.06.028
[11]
Somer, G. and Ünal, Ü. (2004) A New and Direct Method for the Trace Element Determination in Cauliflower by Differential Pulse Polarography. Talanta, 62, 323-328. https://doi.org/10.1016/j.talanta.2003.07.018
[12]
Somer, G., Kalayci, S. and Sendil, O. (2016) A New and Direct Method for the Determination of Trace Elements in Spinach Using Differential Pulse Polarography. Journal of Electroanalytical Chemistry, 778, 49-52. https://doi.org/10.1016/j.jelechem.2016.07.041
[13]
Burba, P. and Willmer, B. (1986) Trace Determination of Molybdenum and Vanadium in Natural Waters by Means of Atomic Spectroscopy (AAS, ICP-OES) after Preconcentration. Fresenius’ Zeitschrift für Analytische Chemie, 324, 298-299. https://doi.org/10.1007/BF00487941
[14]
Gürkan, R., Korkmaz, S. and Altunay, N. (2015) Preconcentration and Determination of Vanadium and Molybdenum in Milk, Vegetables and Foodstuffs by Ultrasonic-Thermostatic-Assisted Cloud Point Extraction Coupled to Flame Atomic Absorption Spectrometry. Talanta, 155, 38-46. https://doi.org/10.1016/j.talanta.2016.04.012
[15]
Barros, J.A.V.A., Virgilio, A., Schiavo, D. and Nóbrega, J.A. (2017) Determination of Ultra-Tracelevels of Mo in Plants by Inductively Coupled Plasma Tandem Mass Spectrometry (ICP-MS/MS). Microchemical Journal, 133, 567-571. https://doi.org/10.1016/j.microc.2017.04.037
[16]
Srinivasan, K. and Rechnitz, G.A. (1969) Selectivity Studies on Liquid Membrane, Ion-Selective Electrodes. Analytical Chemistry, 41, 1203-1208. https://doi.org/10.1021/ac60279a014
[17]
Somer, G., Nakisci, A., Kalayci, S. and Sahin, F. (2006) Trace Element Determination in Brassica Oleraceae var. Acephale by Differential Pulse Polarography. Turkish Journal of Chemistry, 30, 419-423.
[18]
Unal, U. and Somer, G. (2009) Indirect Determination of Trace Tetraborate by Differential Pulse Polarography Using Its Copper Complex and Application to Waste and Drinking Water. Electroanalysis, 21, 2234-2240. https://doi.org/10.1002/elan.200904674
![\"\"](\"Edit_86bf9fd2-feb8-47ca-843d-58a49e1c12c1.png\")
,？![\"\"](\"Edit_bad0c603-27c5-471c-8f19-f98e4b107c30.png\")
and ![\"\"](\"Edit_7bf56849-3cb8-49ac-8398-41dba725a0bf.png\")
. The lifetime of the electrode was more than 2 years, when used at least 4 - 5 times a day, and the response time was about 30 s. This electrode has been used for the determination of molybdenum ion in wine using standard addition method. The validation of the electrode has been made with a commercial molybdenum DP polarography and high consistency was obtained.
