Detection of Lead Using a Sensitive Anodic Stripping Voltammetric Method Based on Composite Mesoporous Silica/Bismuth Oxychloride Modified Electrode

Abstract

Exposure to lead in the environment and food poses severe threat to human health especially for the nervous and hemopoietic system, of which children are more vulnerable than adults. In this study, a sensitive detection platform aimed at the blood lead sample was developed based on BiOCl‐KIT‐6 composite materials modified glassy carbon electrode (BiOCl‐KIT‐6/GCE). The BiOCl‐KIT‐6 composites of varied molar ratio of Bi/Si with a litchi‐like surface structure are facilely prepared under hydrothermal conditions. The synthesized composites and modified electrode were characterized by a combination of physicochemical as well as electrochemical methods. Under optimized experimental conditions, square wave anodic stripping voltammetry (SWASV) was employed to determine the lead concentration using BiOCl‐KIT‐6/GCE, which exhibits a good electrochemical response to Pb (II) with linear calibration curves ranging from 0.2 to 10 and 10 to 300 μg/L and a detection limit of 33 ng/L. The constructed sensor was also successfully used for the electrochemical determination of lead‐spiked human blood sample with desirable accuracy.

Phytochemical Curcumin-Coformulated, Silver-Decorated Melanin-like Polydopamine/Mesoporous Silica Composites with Improved Antibacterial and Chemotherapeutic Effects against Drug-Resistant Cancer Cells

“…The characteristic framework vibration region of SBA-15 consisted of bands centered at 1086, 968, and 806 cm –1 , respectively. The 1086 and 806 cm –1 peaks were assigned to Si–O asymmetric and symmetric stretching bands originating from the intrinsic vibration of SiO 4 tetrahedra, respectively . The characteristic peak of curcumin at 1560 cm –1 was the CO stretching band, but after loading curcumin on the nanoexcipient, the typical band was red-shifted to a lower wavenumber, indicating the involvement of carbonyl groups of curcumin in the chelation of silver and successful loading of curcumin in nanoexcipient SBA-15/PDA/Ag.…”

Simultaneous voltammetric determination of tramadol and paracetamol exploiting glassy carbon electrode modified with FeNi3 nanoalloy in biological and pharmaceutical media

“…[6] It should be noted that some disadvantages have been reported for many of these methods, including the need for more time, difficulty in pre-treatment of specimens, and the need for expensive interfering reagents, highlighting the necessity for development of rapid, sensitive and inexpensive strategy to successfully detect these drugs. [7][8][9][10][11][12][13] One of the recently effective methods to overcome these disadvantages is the use of electrochemical processes due to unique properties such as high selectivity and sensitivity, and the capacity in minimizing the interferences. [14][15][16][17] Oxidation of analytes using electrochemical methods commonly shows a large potential on the bare electrode surface, thus indicating the affinity of analyte detection to interfere with other oxidizable materials.…”