The Use of Nanocomposite Au / Fe₂H₂O₄ –GO Based on Surface Plasmon Resonance to Detect Toxic Arsenic(V) in Aqueous Solution

In this study, the Au / Fe₂H₂O₄-GO films are shown to improve the optical sensors based on the plasmon resonance technique, through the modification of the sensor chip with gold film (48.3nm) for the detection of toxic heavy metal Arsenic (V) in solution, the concentrations of ions in the parts per billion range. Mat lab software employing Fresnel formula for a layer system was used in data analysis. The sensor ranged linearly from 1 to 10 ppb. The SPR curves for the Au / Fe2H2O4-GO with different percentages of graphene oxide GO to Fe₂H₂O₄ (1:10 % (v/v)) respectively were attached separately the prism. The results show that when the films with 3% GO which can be observed as the optimum percentage enhancement of sensitivity for detecting ions from 0.0773°ppb⁻¹ for Au/Fe₂H₂O₄ to 0.2509° ppb⁻¹ for Au / Fe2H2O4-GO. With a limit of detection 0.6 μg/L fulfills the detection requirement below the 10 and 5μg/L contaminant levels of Arsenic as suggested by World Health Organization (WHO) and Environmental Protection Agency (EPA). The analytical method was verified by linearity, detection limits, precision, accuracy, and recovery experiments, achieved acceptable results in all states.