Modified magnetic graphene oxide as an efficient adsorbent for preconcentration of tartrazine

In this research, novel magnetic Graphene Oxide/Fe3O4/Thiourea/Cethyltrimethyammonium Bromide nanocomposites were designed and fabricated as an efficient adsorbent in the service of micro-solid phase extraction for preconcentration of Tartrazine (Tar) before UV-Vis spectrophotometric detection. This adsorbent was fully characterized by Fourier Transform Infrared (FT-IR) spectroscopy, Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), and Energy Dispersive X-ray (EDX) analysis. The mechanism of Tar adsorption was discussed. The operating parameters affecting preconcentration efficiency and spectrophotometric determination were optimized. Under the optimum conditions, this method exhibited a linear range from 5.0 to 1200.0 ng mL(-1) (R-2=0.9993), with a detection limit of 1.1 ng mL(-1). Relative standard deviations (RSD) for intra (n = 10) and inter-day (n = 8) of Tar (400 ng mL(-1)) were 2.2 and 4.8%, respectively. The satisfactory results of analysis of real samples indicate that the method is very favored in the analysis of various complex matrices.

Automated summary

Novel magnetic nanocomposites were designed and fabricated for efficient adsorption in micro-solid phase extraction of Tartrazine. The method showed a linear range of 5.0 to 1200.0 ng mL(-1) with a detection limit of 1.1 ng mL(-1), making it favorable for analysis of complex matrices.