|
Abstract
|
A new adsorbent is described that consists of a magnetite@carbon/dithizone nanocomposite. It was characterized using energydispersive
X-ray spectroscopy, Fourier transform infrared spectroscopy, X-ray diffraction, and field emission scanning electron
microscopy. The magnetic sorbent is shown to be a viable material for the preconcentration of mercury(II) before its quantification
by differential pulse anodic stripping voltammetry. The effects of pH value, eluent, adsorbent amount, sample volume, and
adsorption/desorption time were optimized. The calibration plot extends from 0.25 to 30 ng.mL−1, and the detection limit is
27 pg.mL−1. The preconcentration factor and intra-day and inter-day relative standard deviations are 100, 3.8, and 4.5%,
respectively, for six measurements at 5 ng.mL−1 concentrations of mercury(II). The method was validated by the analysis of
the certified reference material NIST SRM 1566b, and successfully applied to the preconcentration and quantification of
mercury(II) in industrial wastewaters and spiked water samples.
|