Determination of arsenic(III) in water using gold nanorods-modified electrode

In this work, the gold nanorods (GNR) material were successfully synthesized and stabilized by cetyltrimethylammonium bromide (GNR-CTAB) and poly(sodium-4-styrenesulfonate) (GNR-PSS). The result shows that the effect of stabilizers CTAB and PSS are quite uniform. The GNR-PSS solution revealed great stability after 168 h of continuous shaking. The structure of nanoparticles is characterized by UV–Vis spectrum and transmission microscope (TEM). The glassy carbon electrode (GCE) was modified by dropping the GNR material (GNR/GCE) with the nanosized particles onto its surface whose electrochemical properties were studied. Moreover, the determination of As(III) by using electrode was carried out in turn through cyclic voltammetry (CV) and differential pulse anodic stripping voltammetry (DP-ASV). In the result, the modified GNR/GCE electrode exhibited excellent response toward As(III) by using the DP-ASV method, compares to employ the bare GCE, with a limit of detection (LOD) 0.72 ppb and the linear concentration of As(III) between 0.90 and 38.99 ppb. The modified electrode had durable operation with noninterference of Fe(III), Cd(II), Cu(II), Fe(II), Zn(II), and Pb(II) ions. It is worth noting in this report that the products of As(III) analysis process in real sample solutions are reliable compared to the GF-AAS method.