Iodate Sensing Electrodes Based on Phosphotungstate‐ Doped‐Glutaraldehyde‐Cross‐Linked Poly‐L‐lysine Coatings

Abstract

Glassy carbon electrode modified with phosphotungstate-doped-glutaraldehyde-cross-linked poly-l-lysine (PLL-GA-PW) film was employed for iodate determination. The PLL-GA-PW film electrode shows excellent electrocatalytic activity towards iodate reduction with significant reduction of overpotential. Under optimized experimental conditions, a linear range from 5 Â 10 À8 to 2.27 Â 10 À2 M with a sensitivity of 61.75 mA mM À1 was obtained. Possible interfering species, in iodate determination, were evaluated and the applicability of proposed sensor for iodate estimation in table salt was also demonstrated. The PLL-GA-PW film electrode shows fast response, wider linear range, and good selectivity and stability.

Structural aspects of heteropolyacid microemulsions

“…[10][11][12][13] In this, the acid salts of POM anions-the so-called heteropolyacidsare renowned for their combined acidity and redox activity. [14][15][16][17] These behaviours have been exploited for sensor [18][19][20][21] and, very recently, energy storage applications, [22][23][24][25][26] wherein hybrid surfactantencapsulated POM materials are, in general, more durable than the unencapsulated heteropolyacids. The improved stabilities of the amalgamated, inorganic-organic core-shell systems 1,11,13,27 result from the organization of organic surfactants around POMs that alters their physical and chemical properties.…”

Electrodeposited indigotetrasulfonate film onto glutaraldehyde-cross-linked poly-l-lysine modified glassy carbon electrode for detection of dissolved oxygen

“…Solutions of product of poly-L-lysine and glutaraldehyde were prepared by mixing 97.5% PLL and 2.5% GA for 30 min. For this purpose, 1% (w/v) PLL and 0.05% (w/ v) GA solutions were used [13][14][15]17,18]. Ten microliter of the product solution was placed on the polished GCE surface and allowed in room temperature to evaporate the solvent.…”

“…Previous scholars presented that the cross-linking of a proportion of the amino groups in PLL by means of GA might usefully produce a material that would adhere better to electrode surfaces than does PLL itself [13][14][15]. The ratio of PLL-GA could be used to adsorption of different anionic compounds, such as potassium ferricyanide [15], sodium neodocromil [16], phosphotungstate [17], and silicomolybdate [18]. Indigotetrasulfonate (ITS) is an organic dye with redox active species bearing anionic sulfogroups and unstable in neutral or basic aqueous solution [19].…”

Electrochemical behavior of tectoridin and its sensitive determination based on l-arginine modified electrode

“…To date, polymerizations of amion acids have attracted considerable attention and the poly amion acids modified electrodes were extensively applied at the determination of pharmaceutical drugs owing to their excellent electrocatalytic properties [17][18][19]. L-arginine as a kind of amion acids exhibits high biocompatibility, high adsorption ability and the biological activity of redox proteins [20].…”