LAUSR

In this work, an octahedral magnetic metal organic frameworks composed of Fe 3 O 4 @NH 2 -MIL-101 was synthesized through simple solvothermal reaction for magnetic solid phase extraction (MSPE) of six pesticides with benzene ring in environmental water samples. The Fe 3 O 4 @NH 2 -MIL-101 was characterized by various techniques. The results showed Fe 3 O 4 @NH 2 -MIL-101 exhibits ultra-high surface area (1012.7 m 2 g −1 ), large pore volume (0.64 cm 3 g −1 ) and high magnetic responsivity (30.0 emu g −1 ), which can be used as an ideal adsorbent for rapid isolation and enrichment of target analytes. A sensitive method was developed by using Fe 3 O 4 @NH 2 -MIL-101-based MSPE coupled with HPLC (High performance liquid chromatography) with UV (Ultraviolate) detector. The linear range extended to 1000 µg L −1 was achieved, low limits of detection (S/N = 3) of 0.13–0.86 µg L −1 and good reproducibility (1.8–3.1%). The applicability of Fe 3 O 4 @NH 2 -MIL-101 was demonstrated for determining six pesticides in water samples with satisfactory recoveries at two spiking levels of 20.0, 80.0 µg L −1 were in the range of 70.5 to 119.8% with the RSDs less than 8.1%. These accurate experimental results by this method indicated that the novel Fe 3 O 4 @NH 2 -MIL-101 as a MSPE adsorbent was an attractive option for efficient extraction and enrichment trace pesticides in future.