Due to the importance of heavy metal ions determination in water samples for quality control in the health, many routine analytical methods have been developed. But, these methods suffer from some disadvantages. They are either time-consuming, or involve expensive procedure and toxic reagents and solvents. Among various analytical methods, electroanalytical methods are rapid, inexpensive and easy to operate. In the present work, a novel modifier, Fe 2 O 3 @S 2- NPs, for glassy carbon electrode has been synthesized. The synthesized nanocomposite was fully characterized using methods such as Fourier transform infrared spectroscopy, scanning electron microscopy, cyclic voltammetry. Preliminary experiments showed that the nanocomposite has a significant effect on the precocentration and improvement of the ssquare wave anodic stripping voltammetry (SWASV) signal for mercury (II). Anodic stripping current was obtained at +0.238 V (vs. Ag/AgCl). Various chemical and instrumental parameters which could potentially affect the electrochemical signal were optimized. Under the optimized conditions, a linear calibration curve was obtained for mercury (II) in the concentration range 10 380 µg/l with a detection limit of 1.3 µg/l. Furthermore, the method was applied for the determination of mercury (II) ion in real sample with acceptable recoveries and minimal matrix effects. A comparison of figures of merit between the developed method and other previously developed methods showed that a powerful alternative method for the determination of mercury (II) in real samples has been developed.
