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• 1,2-ethanedithiol functionalized magnetic polymer material was fabricated. • The prepared sulfur functionalized MNPs has high adsorption capacity towards Hg. • The MSPE-HPLC-ICP-MS was proposed for mercury speciation in environmental samples. • The method has low LODs, high enrichment factors, and fast analytical speed. 1,2-Ethanedithiol was firstly involved in preparing sulfur-containing functional magnetic polymer material of Fe 3 O 4 @SiO 2 @ glycidyl methacrylate (GMA)-S-SH. The prepared Fe 3 O 4 @SiO 2 @GMA-S-SH magnetic nanoparticles (MNPs) show better adsorption capacity and adsorption/desorption dynamics for mercury species than other -SH functional materials due to the high affinity of both thioether and thiol group towards mercury. A new method of magnetic solid phase extraction (MSPE) using Fe 3 O 4 @SiO 2 @GMA-S-SH as sorbents combined with high performance liquid chromatography (HPLC)-inductively coupled plasma mass spectrometry (ICP-MS) was developed for the analysis of trace Hg2+, methylmercury (MeHg+) and phenylmercury (PhHg+). Variables affecting the simultaneous extraction of three target mercury species were investigated. It was found that Hg2+, MeHg+ and PhHg+ in 200 mL of water sample could be quantitatively adsorbed within 5 min and eluted by 0.5 mL 0.1 mol L−1 nitric acid and 4% thiocarbamide in 2 min. The developed method has high actual enrichment factors of 367, 380, 329-fold for Hg2+, MeHg+ and PhHg+, respectively. The detection limits were 0.40, 0.49 and 1.4 ng L−1 with the relative standard deviations (n = 5, inter-day) of 7.4, 8.1 and 8.3% for Hg2+, MeHg+ and PhHg+, respectively. The accuracy of the method was validated by the analysis of the Certified Reference Materials of GSS-11 soil, GSS-13 soil, GSB21 rice and DORM-2 fish. The established method was successfully used for the mercury speciation in farmland water, soil and rice samples collected from Wanshan, China, and satisfactory recoveries (84.3–116%) were obtained for the spiked samples. [ABSTRACT FROM AUTHOR]

[Display omitted] • MGE which contains two types of quaternary ammonium sites was successfully synthesized. • The performance of MGE in treating NO 3 − and PO 4 3− surpasses that of commercial resins. • Removal of NO 3 −, PO 4 3−, and HA by MGE conforms to pseudo-second-order kinetic and Freundlich isotherm equations. • The effluent from MGE met the water quality standards for scenic environmental use. • The H-bonds between HA and NH 4 + enhances the NH 4 + removal by anionic resins. The direct discharge of secondary effluent (SE) from wastewater treatment plants without proper nitrogen and phosphorus treatments can result in the eutrophication of landscape water bodies. The primary objective of advanced treatment should focus on the removal of NO 3 − and PO 4 3− as the optimal approach. In this study, magnetic resin microspheres known as MGE (derived from the initials of the three organic monomers used, namely methyl methacrylate, glycidyl methacrylate, and 3,4-epoxy-1-butene) were successfully prepared through suspension polymerization. MGE incorporated two types of sites specifically designed for the removal of anionic nitrogen and phosphorus nutrients. The removal of NO 3 −, PO 4 3−, and humic acid (HA) by MGE fit well with the pseudo-second-order kinetic and Freundlich adsorption isotherm models (R2 = 0.884–0.993 and 0.918–0.969, respectively). The removal efficiencies of ultraviolet absorbance at 254 nm, total nitrogen, total phosphorus, NO 3 −, PO 4 3−, and total fluorescence in SE by MGE were 50.4 %, 20.9 %, 27.1 %, 21.5 %, 30.2 %, and 42.0 %, respectively, which were significantly higher than those achieved by commercially available MIEX® and D201. The molecular dynamic simulation results indicated that the increased removal of NH 4 + by resin after adsorption of HA can be attributed to the aggregation effect of HA and NH 4 + caused by H-bonds. The nitrogen and phosphorus indicators of the MGE effluent met the GB/T 18921-2019 water quality standard for scenic environmental use in China. MGE exhibited exceptional adsorption capacity and rapid achievement of adsorption equilibrium, making it a potential adsorbent for the removal of anionic nitrogen and phosphorus nutrients in engineering applications. [ABSTRACT FROM AUTHOR]