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

Abstract

Arsenic poisoning in the environment can cause severe effects on human health, hence detection is crucial. An electrochemical-based portable assessment of arsenic contamination is the ability to identify arsenite (As(III)). To achieve this, a low-cost electroanalytical assay for the detection of As(III) utilizing a silica nanoparticles (SiNPs)-modified screen-printed carbon electrode (SPCE) was developed. The morphological and elemental analysis of functionalized SiNPs and a SiNPs/SPCE-modified sensor was studied using field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDX), and Fourier transform infrared spectroscopy (FTIR). The electrochemical responses towards arsenic detection were measured using the cyclic voltammetry (CV) and linear sweep anodic stripping voltammetry (LSASV) techniques. Under optimized conditions, the anodic peak current was proportional to the As(III) concentration over a wide linear range of 5 to 30 µg/L, with a detection limit of 6.2 µg/L. The suggested approach was effectively valid for the testing of As(III) found within the real water samples with good reproducibility and stability.

Silica and graphene mediate arsenic detection in mature rice grain by a newly patterned current–volt aptasensor

“…The bands peaks at 1406, 1384, and 1360 cm −1 represent the OH bond, the methyl (CH 3 ), and the common inorganic ions of nitrate 59 . The first sharp band at 1324 cm −1 represents the secondary aromatic amine with C–N stretching, while the second peak exhibits a strong and sharp bend at 1065 cm −1 , representing the silicon–oxy compounds (Si–O–C) 60 . The last band peaks was located at 1022, 827, and 752 cm −1 for methylene (> CH 2 ) as saturated aliphatic in form of cyclohexane ring vibrations and the last two from an aromatic ring, which specifically as C–H 1,4 and C–H 1,2 from aromatic ring (aryl) 58 .…”

Advances in Electrochemical Detection Electrodes for As(III)

“…The method is highly sensitive and reproducible with a relative standard deviation of 4.52%, which is promising for application. In addition, they also tried to detect As(III) using silicon nanoparticles (SiNPs)-modified screen-printed electrodes (SPCE) and tested the electrochemical response of the electrode to arsenic using cyclic voltammetry (CV) and linear scanning anodic solvation voltammetry (LSASV) [ 219 ]. Under the optimized conditions, the peak anode current showed good linearity in the concentration range of 5–30 μg/L As(III) with a detection limit of 6.2 μg/L.…”

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

“…SPCE electrodes were washed twice to remove impurities physically adsorbed on the electrode surface with double distilled water, then dried at room temperature and characterized using SEM and DPV in 10 mM K3[Fe(CN)6] solution in 0.1 M KCl as the supporting electrolyte [21].…”

“…Natural sand is a commonly use source of silica which is mixed with oxides and other minerals and therefore, a separation is needed to obtain pure silica by the alkaline fusion method [20]. Up to now, SPCE electrode modified with natural silica-ceria composite has never been carried out, and only synthetic silica was applied in biosensors to detect some inorganic compounds [21,22]. One of the uses of natural silica produced from natural sand in this study [20] is to stabilize ceria nanoparticles.…”