Sensitive determination of As (III) and As (V) by magnetic solid phase extraction with Fe@polyethyleneimine in combination with hydride generation atomic fluorescence spectrometry.
The magnetic nanomaterial Fe@polyethyleneimine (Fe@PEI) was successfully synthesized and used as an effective adsorbent material for magnetic solid phase extraction(MSPE) of As(III) and As(V) from water samples. Fe@SiO2 nanoparticles were prepared by one pot synthetic method using a borohydride reduction method, then modified with (3-chloropropyl)trimethoxysilane to obtain Fe@SiO2-Cl by chloropropylation, which was reacted with PEI to achieve Fe@polyethyleneimine (Fe@PEI). The microstructure and morphology of Fe@PEI were characterized by transmission electron microscoscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), and X-ray diffraction (XRD). The experimental results showed that Fe@PEI demonstrated excellent adsorption for As(III) and As(V). Based on this fact, the determination method for these two arsenic species earned good limits of detection (LODs) of 0.002μgL(-1) and wide calibration curves in the concentration range from 0.008 to 0.2μgL(-1). The precisions of As (III) and As (V)were 1.95% and 2.55% (RSD, n=6), respectively. The proposed method was validated with real samples and the spiked recoveries were in the range of 82.7-98.3% and the accuracies were in the range of 2-13.3%. The results demonstrated that the developed MSPE method had good advantages such as simplicity, rapid separation, low cost, easy to reuse and high-quality analytical performances, which made it attractive for rapid and efficient extraction of inorganic arsenic species in the environmental water samples.
College of Geosciences, China University of Petroleum Beijing, Beijing 102249, China. Electronic address: zhouqx@cup.edu.cn.
Qingxiang
Q
Zhou
College of Geosciences, China University of Petroleum Beijing, Beijing 102249, China; College of Chemistry and bioengineering, University of Science and Technology Beijing, Beijing 100083, China.
Zhenwen
Z
Zheng
College of Chemistry and bioengineering, University of Science and Technology Beijing, Beijing 100083, China.
Junping
J
Xiao
College of Chemistry and bioengineering, University of Science and Technology Beijing, Beijing 100083, China.
Huili
H
Fan
Arsenic; Atomic fluorescence spectrometry; Fe@PEI; Magnetic solid-phase extraction