Journal
MICROCHIMICA ACTA
Volume 184, Issue 8, Pages 2551-2559Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-017-2251-y
Keywords
Beverage; Milk; Plasticizer; X-ray diffraction; High-resolution transmission electron microscopy; Nitrogen adsorption-desorption isotherms
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Funding
- National Natural Science Foundation of China [31,571,925, 31,471,643, 31,671,930]
- Hebei Double First Class Discipline Construction Foundation for the Discipline of Food Science and Engineering of Hebei Agricultural University [2016SPGCA18]
- Natural Science Foundation of Hebei Provinces [B2016204136]
- Scientific and Technological Research Foundation of the Department of Education of Hebei Province [ZD2016085]
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The authors describe the preparation of magnetic cobalt/nitrogen-doped carbon microspheres (Co-N/Cs) by combining a hydrothermal procedure with a carbonization process. The textures of the Co-N/Cs were investigated by powder X-ray diffraction, scanning electron microscopy, high-resolution transmission electron microscopy, nitrogen adsorption-desorption isotherms and vibration sample magnetometry. The Co-N/Cs possess a high surface area and strong magnetism. This results in good adsorption capability and enables magnetic separation. The Co-N/Cs are shown to be an effective magnetic solid-phase extraction adsorbent for the enrichment of various phthalate esters (diethyl phthalate, diallyl phthalate and diisobutyl phthalate) from sport beverages and milk samples prior to their determination by HPLC. The limits of detection (at an S/N ratio of 3) are between 0.1-0.2 and 0.08-0.3 ng mL(-1) for sport beverages and milk samples, respectively. The recoveries when extracting all the spiked samples varied from 80.3% to 116.2%.
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