Development of a carbon nanotubes paste electrode modified with crosslinked chitosan for cadmium(II) and mercury(II) determination

Abstract

a b s t r a c tA functionalized carbon nanotubes paste electrode modified with cross-linked chitosan for the determination of trace amounts of cadmium(II) and mercury(II) by linear anodic stripping voltammetry is described. Under optimal experimental conditions, the peak current was linear in the Cd(II) concentration range from 5.9 Â 10 À8 to 1.5 Â 10 À6 mol L À1 with a detection limit of 9.8 Â 10 À9 mol L À1 and, for Hg(II) from 6.7 Â 10 À9 to 8.3 Â 10 À8 mol L À1 with a detection limit of 2.4 Â 10 À9 mol L À1 . The proposed method was successfully applied for the determination of Hg(II) in natural and industrial wastewater samples, and Cd(II) in sediments, human urine, natural, and industrial wastewater samples.

An Overview of Pesticide Monitoring at Environmental Samples Using Carbon Nanotubes-Based Electrochemical Sensors

“…Carbon nanotubes are widely used in the development of electrochemical sensors for the detection of drugs, dyes, ions, phenols, and pesticides [38][39][40][41][42][43][44]. In the course of this review, we will present an overview of the recent advances in the preparation of electrochemical sensors based on carbon nanotubes for the determination of pesticides in environmental samples.…”

A Portable Microcontrolled Pumping Flow System Developed to In Loco Determination of Diuron at Nanomolar Levels Employing a Disposable Biosensor

“…In this context, several research groups have been proposed sensors and biosensors based on nanostructured materials [14][15][16][17][18], such as carbon nanotubes, graphene and metal nanoparticles [12]. In fact, particularity gold nanoparticles (AuNPs) exhibit electronic, optical and chemical properties very attractive for various technological applications such as nanoelectronics, sensors/biosensors, optics and catalysis [19].…”

A novel architecture based upon multi-walled carbon nanotubes and ionic liquid to improve the electroanalytical detection of ciprofibrate

“…[15][16][17][18][19][20] When carbon nanotubes are used as a modier of traditional electrodic surfaces (e.g. glassy carbon electrode (GCE) 21,22 ) or even as the electrode material (e.g.…”

“…glassy carbon electrode (GCE) 21,22 ) or even as the electrode material (e.g. carbon nanotube paste electrode 18,19,23 ), two effects can be generally observed: 24,25 (i) work potential is reduced, making it possible to detect analytes at a lower potential where interferences from concomitant compounds decreases and, thus, improves the selectivity of the sensor; and (ii) the peak current (analytical signal) increases due to high electroactive surface area provided by the nanomaterial, which improves the analytical parameters such as the detection limit and analytical sensitivity.…”