A sensitive electrochemical nitrate sensor based on polypyrrole coated palladium nanoclusters

Mahmoudian, M.R.; Alias, Yatimah; Basirun, Wan Jefrey; Woi, Pei Meng; Jamali‐Sheini, Farid; Sookhakian, M.; Silakhori, Mahyar

doi:10.1016/j.jelechem.2015.05.026

Cited by 46 publications

(17 citation statements)

References 42 publications

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“…За рахунок простого адсорбційного закріплення четвертинних амонієвих солей (ЧАС) силікагелі (СГ) набувають властивостей аніоніту, що дозволяє поєднувати операції концентрування та детектування безпосередньо у фазі концентрату. Сорбція забарвлених сполук на модифікованих носіях відкриває нові можливості для створення комбінованих спектрометричних методик і тест-систем для експрес-аналізу [11][12][13][14][15][16].…”

Section: модифицированный электрод для вольтамперометрического опредеunclassified

“…Оскільки процеси відновлення необоротні, то необхідно забезпечити наявність на поверхні робочого електрода великої кількості каталітично активних центрів. Як матеріал для виготовлення робочих електродів застосовують важкі метали [14,15] та різні вуглецеві матеріали [16,17]. Серед металічних найбільш перспективними виявилися мідні, кадмієві та срібні електроди.…”

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Modified Electrode for No3- Determination in Saline Waters by Voltammetry Method

Smyk

Kopanytsa

2019

Bull. T. Shevchenko Nat. Univ. Kyiv. Chem.

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A certain level of NO3- in water is necessary for the growth of algae. Most aquatic organisms can survive at relatively high nitrate levels, but concentrations higher than 0.2 mg/l cause fish diseases, eutrophication and algal bloom in aquariums. Thus, it is necessary to monitor the level of nitrates in aquarium water. When choosing the method of nitrate level analysis that will be used to develop an in-site saltwater monitor system, we should take into account several key factors, such as the threshold concentration and possible inferences, including high levels of Cl- in saltwater. Other desired criteria for the method are the need to get results in real time, low cost of production, and a way to perform the measurements in-site without the need for highly skilled personnel. The voltammetry was chosen as a method that satisfies our criteria. It is known that nitrate can be reduced quantitatively on a copper electrode. However, the copper electrode becomes poisoned after only a few minutes of use. Previous studies showed that a thin layer of copper deposited on the surface of various commonly used electrodes significantly improve the perfomance of the sensing system. This paper describes the fabrication process of voltammetric sensor and shows the advantage of using a glassy carbon electrode modified with electrodeposited copper layer to measure the concentration of nitrate in sea water. We have found that the modified sensor can be effectively used to catalyze nitrate reduction with a welldefined reduction wave with E= -1.1 V. We performed the cyclic voltammetric (CV) experiments and chose an optimal supporting electrolyte and the optimal conditions for the pretreatment. It was found that the peak current of nitrate increases with the increase of Cl- concentration and is stable in the range (2–3)⋅10-1 mol/l. The pH value from 3.5 to 6.0 does not influence the reaction on an electrode. The developed sensor was used to direct determine of nitrate in artificial seawater without of any sample preparation. Potentiometry with standard proсedure of Cl- precipitation was used to validate all the results. The values obtained by both methods were in good agreement with each other.

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Section: модифицированный электрод для вольтамперометрического опредеunclassified

unclassified

Modified Electrode for No3- Determination in Saline Waters by Voltammetry Method

Smyk

Kopanytsa

2019

Bull. T. Shevchenko Nat. Univ. Kyiv. Chem.

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“…Table 5 summarises the main advantages and disadvantages of electrochemical systems. [29,30,56,66,68,72] * Less power consumption during operation [28,30] * Simple operation for direct determination of nitrate [29,30,68] *High selectivity towards targeted ions [30,56] *Fast response/feedback system [66,67] *Suitable for in situ/on line analyses [30,66] *Viable approach for portable application as relatively simple [30,56] *Low-cost system [56,68] *Small and compact system [29,30] *Surface cumulative passivation effect [28] *Complicated programmed potential protocol for renewal of microelectrode surface/electrode reactivation [28] *Extensive procedure for reagent preparation [27] *Measurement result is influenced by other contamination in analyte solution/samples [26] *Tedious reagent preparation procedure [27] *Sensitive materials such as dope polypyrrole need to be stored in the dark during polymerisation [26,29] *Sensitive materials such as dope polypyrrole are expensive [29,30] *Sensitive materials such as nitrate reductase enzymes are too sophisticated to be field-deployable [29,30] *Interference of other ions in water such as chloride, sulphate and phosphate [26] *Requirement of different types of material for the electrode in the system such as working, counter and reference electrode [27,…”

Section: And Mohd Amri MD Yunus Techniques In Advancing the Capabilimentioning

confidence: 99%

Techniques in Advancing the Capabilities of Various Nitrate Detection Methods: A Review

Azmi

Azman

Ibrahim

et al. 2017

International Journal on Smart Sensing and Intelligent Systems

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“…(1): (1) where S B is the standard deviation of the blank solution, and b is the slope of the analytical curve. 30 Standard deviation was calculated using four blank measurement results and the analytical curve that was obtained with pesticide concentration, and electrochemical signal data was used to calculate the slope.…”

Section: Sensor Measurementsmentioning

confidence: 99%

Electrochemical pesticide sensor based on anthraquinone substituted copper phthalocyanine

İpek

Şener

Koca

2017

International Journal of Chemistry and Technology

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In this study, a biomimetic selective pesticide electrochemical sensor based on copper phthalocyanineanthraquinone hybrid (CuPc-AQ) was studied. Electrochemical activities based on Pc ring and anthraquinone substituent of the CuPc-AQ make it valuable material for electrochemical sensor studies in detecting of pesticides. Thin film of CuPc-AQ on ITO electrode (ITO/CuPc-AQ) was exposed to water samples containing eserine and carbofuran pesticides, separately. Then in order to observe the sensor behavior of the modified electrode, square wave voltammetry (SWV), electrochemical impedance spectroscopy (EIS), and double potential step chronocoulometry (DPSCC) techniques were used. When the ITO/CuPc-AQ electrode was doped with nano-platinum (nPt) or nano-gold (nAu) particles, the sensitivity of ITO/CuPc-AQ electrode increased. The lowest detection limit (DL) (1.23x10-9 mol dm-3) was obtained with ITO/CuPc-AQ-nAu electrode using electrochemical impedance spectroscopy technique. ÖZBu çalışmada antrakinon hibrit bakır ftalosiyanin (CuPc-AQ) temelli, seçici bir elektrokimyasal pestisit sensörü üzerinde çalışılmıştır. CuPc-AQ'un, ftalosiyanin halkası ve antrakinon substituenti kaynaklı elektrokimyasal aktiviteleri, bu malzemeyi pestisitlerin saptanmasında kullanılacak olan elektrokimyasal sensor çalışmaları için değerli kılmaktadır. ITO elektrot üzerinde bulunan CuPc-AQ ince filmi (ITO/CuPc-AQ) eserin ve carbofuran pestisitleri içeren su numunelerine ayrı ayrı maruz bırakılmış ve daha sonra kare dalga voltametrisi (SWV), elektrokimyasal empedans spektroskopisi (EIS) ve çift potansiyel basamaklı kronokulometri (DPSCC) teknikleri kullanılarak modifiye elektrodun sensor davranışları incelenmiştir. ITO/CuPc-AQ elektrodu, nano-Platin (nPt) ya da nano-Altın (nAu) parçacıkları ile yüklendiğinde ITO/CuPc-AQ elektrodunun hassasiyeti artmıştır. En düşük saptama limiti değeri (DL) (1.23x10 -9 mol dm -3 ) ITO/CuPc-AQ-nAu elektrodu ile elektrokimyasal empedans spektroskopisi tekniği kullanıldığında elde edilmiştir.

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A sensitive electrochemical nitrate sensor based on polypyrrole coated palladium nanoclusters

Cited by 46 publications

References 42 publications

Modified Electrode for No3- Determination in Saline Waters by Voltammetry Method

Modified Electrode for No3- Determination in Saline Waters by Voltammetry Method

Techniques in Advancing the Capabilities of Various Nitrate Detection Methods: A Review

Electrochemical pesticide sensor based on anthraquinone substituted copper phthalocyanine

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