Development of Electrochemical Sensor Based on Silica/Gold Nanoparticles Modified Electrode for Detection of Arsenite

Abstract

Arsenic is an extremely poison element in earth crust and its contamination in environment is a global hazard. In this study, an efficient electrochemical detection of arsenite [As(III)] has been developed using linear sweep anodic stripping voltammetry (LSASV), based on adsorption of arsenic on the surface of screen printed carbon electrode modified silica/gold nanoparticles (SiNPs/AuNPs/SPCE). The surface property of modified electrode was characterized by field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDX) and fourier transform infrared spectroscopy (FTIR). The morphology studies using FESEM showed that the distribution of SiNPs/AuNPs composite is not homogenous therefore resulting in some areas with aggregation on the working electrode surface. Several optimum voltammetric parameters were established such as supporting electrolyte, 1 M HCl; deposition potential, -0.4 V and deposition time, 300 s. Under optimum condition, a linear correlation was obtained in the range of 10 -100 ppb with limit of detection 5.6 ppb. A variety of common coexistence ions such as Pb 2+ , Ni 2+ , Zn 2+ , Hg 2+ and Cu 2+ in water samples showed no interferences in arsenite detection. The proposed method showed high sensitivity and good reproducibility with a relative standard deviation of 4.52 %, providing potential application of arsenite detection in environment.

Electrochemical Detection of Arsenite Using a Silica Nanoparticles-Modified Screen-Printed Carbon Electrode

“…Evidently, although the SiNPs/SPCE was unable to demonstrate the lowest limit of detection (LOD) in comparison with the previous reported works [ 5 , 22 ], the SiNPs/SPCE reported in this research had not only offered a competitive detection limit but a simplification of the analytical procedure through the alleviation of the requirement for electrode modification. Moreover, the proposed sensor had performed satisfactorily in a range of real samples analyses.…”

“…The proposed scheme can be introduced as a new route for a simple, fast, and practical method in the advancement of sensor studies from the existing scheme, in which the latter requires complicated fabrication protocols using high-cost materials. Evidently, although the SiNPs/SPCE was unable to demonstrate the lowest limit of detection (LOD) in comparison with the previous reported works [5,22], the SiNPs/SPCE reported in this research had not only offered a competitive detection limit but a simplification of the analytical procedure through the alleviation of the requirement for electrode modification. Moreover, the proposed sensor had performed satisfactorily in a range of real samples analyses.…”

“…Considering that, a previous work had demonstrated the development of an electrochemical sensor utilizing gold nanoparticles combined with silica nanoparticles (Au-SiNPs) as a sensing platform for arsenic detection. In this two-steps of nanoparticles-modified screen-printed carbon electrode (SPCE) approach, the developed sensor showed good sensitivity and selectivity towards As(III) determination, with a low detection limit of 5.6 ppb [22]. Although the AuNPs-modified electrode has been widely used in arsenic determination, such electrodes still come with disadvantages, including the high cost of noble metals that makes the system inefficient for routine analysis, as well as the non-uniform coatings caused by the easy agglomeration of small-sized nanoparticles, therefore, complicating the fabrication protocols [23].…”

Advances in Electrochemical Detection Electrodes for As(III)

“…Suhainie Ismail et al developed an efficient electrochemical detection method for arsenite using linear scanning anodic solvation voltammetry (LSASV) based on silicon nanoparticles and gold nanoparticles (SiNPs/AuNPs/SPCE) modifying the screen-printed electrode surface [ 93 ]. The electrode showed good linearity in the concentration range of 10–100 ppb with a detection limit of 5.6 ppb.…”

Screen-printed carbon electrode/natural silica-ceria nanocomposite for electrochemical aptasensor application

“…In addition of improving biosensor performance, the basic functions of nanoparticles can be mainly classified as: 1) immobilization of biomolecules; 2) catalysis of electrochemical reactions; 3) enhancement of electron transfer; 4) labeling biomolecules and 5) acting as the reactant [2]. Many types of nanomaterials have been reported to modify electrode surfaces, for example, a screen-printed carbon (SPCE) immunosensor was modified with AuNP [3][4][5][6][7][8], and SPCE aptasensor was modified with ceria [3,9,10]. Silica-based nanocomposites have been widely developed as electrode modifiers, such as silica-Au nanocomposite for the detection of the enzyme glucose oxidase [11], c-creative protein [12], and arsenic detection [5].…”