2008
DOI: 10.3390/s8095806
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Voltammetric Detection of Urea on an Ag-Modified Zeolite-Expanded Graphite-Epoxy Composite Electrode

Abstract: In this paper, a modified expanded graphite composite electrode based on natural zeolitic volcanic tuff modified with silver (EG-Ag-Z-Epoxy) was developed. Cyclic voltammetry measurements revealed a reasonably fast electron transfer and a good stability of the electrode in 0.1 M NaOH supporting electrolyte. This modified electrode exhibited moderate electrocatalytic effect towards urea oxidation, allowing its determination in aqueous solution. The linear dependence of the current versus urea concentration was … Show more

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Cited by 44 publications
(33 citation statements)
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“…These particles result in the RS signal enhancing at 474 nm. With the increase of urea concentration, the formed NH 4 ? increased and more (NH 4 -TPB) n association particles were produced.…”
Section: Resultsmentioning
confidence: 98%
See 2 more Smart Citations
“…These particles result in the RS signal enhancing at 474 nm. With the increase of urea concentration, the formed NH 4 ? increased and more (NH 4 -TPB) n association particles were produced.…”
Section: Resultsmentioning
confidence: 98%
“…The PDAB method had a linear range of 10-300 lg/mL, with a detection limit of 15 mg/kg urea [2], but its operation was also complicated. The enzyme electrode was used to detect urea as low as 0.05 mmol/L [4], with selectivity, stability and rapidity. The coupling enzyme methods include urease-leucine dehydrogenase and urease-glutamate dehydrogenase.…”
Section: Introductionmentioning
confidence: 99%
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“…Transition metal-containing zeolites were found to exhibit a high catalytic activity. Ni-containing zeolites [5], Agzeolites [6], Pd-zeolites [7], Ti-zeolites [8], Pt-and Pt-Ru-zeolites [9] have been used for catalytic purposes. On the other hand, hydrogen peroxide plays a significant role in the chemical and pharmaceutical industries as an oxidizing, bleaching and sterilizing agent.…”
Section: Introductionmentioning
confidence: 99%
“…Due to these properties, e.g. ion-exchange capacity, molecular selectivity, catalyst-assisted reactivity, microporous structure and conductivity, they are frequently used in composite electrodes [19], [20].…”
Section: Introductionmentioning
confidence: 99%