Abstract:

A magnetic nanoparticle Fe3O4/C was prepared by solvothermal/hydrothermal method and characterized by
transmission electron microscope, Fourier transform infrared spectroscopy and X-ray diffraction. Using the material as a
magnetic solid phase extraction sorbent, a new method for the detection of trace crystal violet (CV) in water was established
by UV spectrophotometry. Effects of several factors including sample pH stirring time, and adsorption temperature on
the percent adsorption of CV were investigated. The optimum adsorption conditions were determined as follows: pH,
8.0; stirring time, 10 min; and temperature, 25 ℃, and high desorption efficiency was achieved using ethanol-0.5 mol/L
p-toluenesulfonic acid (9:1, V/V) as the eluent. Under the optimum conditions, the limit of detection (LOD) of this method
was 0.024 mg/L. The proposed method was applied to the determination of CV in Ganjiang river water with spiked
recoveries of 105.8%–108.4% and relative standard deviation (RSD) of 3.6%–6.1%, respectively.

Key words: magnetic nanomaterials, crystal violet, enrichment, water sample