Abstract
Magnetic porous microspheres composed of Fe3C, MnO and graphitic carbon (Fe3C/MnO/GC) were prepared by a one-pot method. A polycondensate obtained from urea and formaldehyde served as the carbon source and was calcined in the presence of metallic iron and manganese to yield Fe3C/MnO/GC. The resultant hybrid has highly mesoporous architecture, large specific surface, graphitic structure and adequate saturation magnetism. It is shown to possess excellent pre-concentration ability for herbicides (monuron, chlortoluron, atrazine and terbutylhylazine). The sorbent can be easily separated and has a long service lifetime (>25 cycles). Under optimized conditions, the sorbent excels by good recoveries (78–120%), high enrichment factors (45–50) and good precision (RSDs ≤10.7%). The limits of detection are 0.01–0.10 μg L−1 for (spiked) water samples, 0.22–0.87 μg kg−1 for grape samples, and 0.18–0.74 μg kg−1 for potato samples. This work offers a new strategy for the construction of magnetic bimetallic heterostructured GC hybrids.
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This work was supported by National Nature Science Foundation of China (Grant Nos. 21707061 and 51672116) and Research Fund for the Doctoral Program of Liaoning Province (Grant No. 20180540060).
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Tong, Y., Liu, X. & Zhang, L. One-pot fabrication of magnetic porous Fe3C/MnO/graphitic carbon microspheres for dispersive solid-phase extraction of herbicides prior to their quantification by HPLC. Microchim Acta 186, 256 (2019). https://doi.org/10.1007/s00604-019-3358-0
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DOI: https://doi.org/10.1007/s00604-019-3358-0