Abstract
A magnetic graphene/polydopamine (MG/PDA) nanocomposite has been prepared and used as sorbent for magnetic dispersive solid-phase extraction (MDSPE) of four benzoylurea insecticides in environmental water samples. The obtained nanocomposites were characterized by transmission electron microscopy, scanning electron microscopy, vibrating sample magnetometry, powder X-ray diffraction, fourier transform infrared spectroscopy, surface area and porosity analysis and thermogravimetric analysis. To investigate the adsorption performance of MG/PDA for target analytes, various parameters affecting the MG/PDA-based MDSPE procedure were optimized. Under the optimal conditions, the established method exhibits good linearity (R2 ≥ 0.9988) in the concentration range 2.5–500 µg L−1. A low limit of detection (0.75 µg L−1, signal/noise = 3:1), a low limit of quantification (2.50 µg L−1, signal/noise = 10:1), and good precision (intraday relative standard deviation ≤3.6%, interday relative standard deviation ≤4.5%) are also achieved. Finally, the simple, fast, and sensitive sample preparation technique was successfully used to determine benzoylurea insecticides in environmental water samples.
Highlights
Benzoylurea insecticides (BUIs), as a class of insect growth regulators, have been widely used to control insects because of their capability to interfere with chitin synthesis and inhibit the molting process of target pests[1,2]
The aim of this study is to prepare the magnetic graphene/polydopamine (MG/PDA) nanocomposite and develop a simple, fast, and sensitive sample preparation method based on magnetic Dispersive solid-phase extraction (DSPE) (MDSPE) coupled with HPLC and diode array detection (DAD) for the determination of BUIs in environmental water samples
The prepared magnetic graphene (MG)/PDA nanocomposite exhibit a rough morphology on surface due to the fold of graphene layer and the surface modification of PDA (Fig. 2C), suggesting that the synthetic magnetic nanocomposite material possesses good prospect of applicability in the adsorption of BUIs
Summary
Benzoylurea insecticides (BUIs), as a class of insect growth regulators, have been widely used to control insects because of their capability to interfere with chitin synthesis and inhibit the molting process of target pests[1,2]. A large number of mehods have been researched and developed for the analysis BUIs in water samples, such as dispersive liquid–liquid microextraction, solid-phase extraction (SPE) and solid-phase microextraction (SPME)[7,8,9]. Dispersive solid-phase extraction (DSPE), which is a miniaturized SPE method introduced in 200310, is considered to be a quick, easy, cheap, effective, robust, and safe sample preparation method. Several materials have been prepared for the preparing of magnetic sorbents to extract BUIs from different matrixes, such as attapulgite[1], ionic liquids[12], and polymers[2,13]. A combination of MG and PDA shows good prospects as an adsorbent for MDSPE of BUIs in water samples
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