Year-end Sale % OFF 
Abstract
This paper reports the synthesis and characterization of the water-soluble form of 3-n-propyl(4-methylpyridinium) silsesquioxane chloride (Si4Pic+Cl−), which showed potential for application as a stabilizing agent for gold nanoparticles (AuNP). Dispersed and stable suspensions of nanoparticles, with an average diameter of 45nm, were obtained. Carbon paste electrodes modified with gold nanoparticles and Si4Pic+Cl− were constructed and applied in the detection and quantification of sulfite in acidic medium. Under these conditions, sulfur is in the electroactive form (sulfur dioxide) with a typical reduction peak at ca. −0.35V (vs. SCE). Considering the voltammetric signal for sulfite, the electrode modified with AuNP (CPE/Au-Si4Pic+Cl−) showed an electrocatalytic effect of ca. −0.20V compared to the bare electrode. In the square-wave voltammetry analysis, under optimized experimental conditions, the reduction peak increased with an increasing concentration of sulfite in the range of 2.54 to 48.6mgL−1. The calculated LOD and LOQ values for sulfite were 0.88 and 2.68mgL−1, respectively. The proposed method was successfully applied to white wine and coconut water samples, and no matrix effects were noted. Validation was performed through a comparison with results obtained by iodimetric titration. In recovery tests, the percentage recovery varied from 98 to 103% (n=3).
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
