Sensitive determination of phenylurea herbicides in soybean milk and tomato samples by a novel hypercrosslinked polymer based solid-phase extraction coupled with high performance liquid chromatography.

Affiliation

College of Science, Hebei Agricultural University, Baoding 071001, Hebei, China. Electronic address: [Email]

Abstract

A heterocyclic hypercrosslinked polymer (Py-DMB HCP) was prepared by Friedel-Crafts alkylation reaction using pyrrole as monomer and p-dimethoxybenzene as crosslinker. The Py-DMB HCP was employed as an adsorbent for solid-phase extraction (SPE) of phenylurea herbicides (PUHs) and showed superior extraction performance. Thus, a sensitive analytical method for the determination of PUHs from soybean milk and tomato samples was established by combining Py-DMB HCP based SPE with high performance liquid chromatography. Under the optimal conditions, good sensitivity was achieved with the detection limits of 0.10-0.20 ng mL-1 and 0.06-0.15 ng g-1 for soybean milk and tomato samples, respectively. The linearity range of PUHs was 0.3-150.0 ng mL-1 and 0.2-150.0 ng g-1, respectively. The recoveries were 87.4% to 116% with relative standard deviations lower than 6.5%. Density functional theory calculation was performed to study the intermolecular interaction mechanism, demonstrating the coexistence of both the H-bonding and π-π interactions in the adsorption process.

Keywords

Buturon (PubChem CID: 19587),Chlortoluron (PubChem CID: 27375),Density functional theory,Heterocyclic hypercrosslinked polymer,High performance liquid chromatography,Metoxuron (PubChem CID: 29863),Monolinuron (PubChem CID: 15629),Monuron (PubChem CID: 8800),Phenylurea,Solid-phase extraction,

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