Abstract
The objective of this research is to develop an effective sensor for measuring arsenic ions. Mangifera indica leaf extract (MILE), coated with gold nanoparticles (AuNPs) at concentrations of 3, 5, 7, and 9 mM, were prepared using the Turkevich method (a relatively simple and reproducible technique for the synthesis of spherical particles). The nanoparticle size of 5 mM gold in trisodium citrate was 31.73 ± 0.59 nm, which is the most appropriate size for modifying a surface with MILE at 0.1% due to its small size and stabilizer qualities. Compared with arsenic on selectivity, the effect of the other metal ions, including (Cd(II), Cu(II), Hg(II), Mn(II), Pb(II), Ni(II), and Cr(III)) was studied. The results indicated that MILE/AuNPs showed the highest specific selectivity as As-MILE/AuNPs formation of complexes. Moreover, electrical chemical efficiency was performed by cyclic and square wave voltammetry. The experiment showed that gold nanoparticles improved with 0.1% MILE can detect arsenic ions with a limit of detection (LOD) of 0.04 ppb, which is below the World Health Organization’s (WHO) permissible limit of 10 ppb. Thus, the electrical chemical sensor that improved screen-printed carbon electrode (SPCE)-modified surfaces with 0.1% MILE-coated AuNPs could be used to effectively detect arsenic ions.
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