期刊
FOOD CHEMISTRY
卷 359, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2021.129958
关键词
Magnetic dispersive micro-solid phase extrac-tion; Solidified floating organic drop; microextraction; 1-phenyl-3-methyl-4-benzoyl-5-pyrazone; Mn(II); Mn(VII); Beverage samples
资金
- Nature Science Foundation of Hubei Province [2019CFB159]
- Research and Innovation Initiatives of Wuhan Polytechnic University [2018J04, 2018Y07]
MDMSPE coupled with SFODME was used for direct separation and preconcentration of Mn(II) and Mn(VII) before graphite furnace atomic absorption spectrometry. The method provided an enrichment factor of 200-fold with detection limits of 0.005 and 0.007 ng mL-1 for Mn(II) and Mn(VII) respectively. Recovery rates of spike experiments ranged from 92.5 to 106%.
Magnetic dispersive micro-solid phase extraction (MDMSPE) was coupled with solidified floating organic drop microextraction (SFODME) for direct separation and preconcentration of Mn(II) and Mn(VII) before graphite furnace atomic absorption spectrometry determination. MDMSPE involved use of magnetic ZnFe2O4 nanotubes for adsorbing Mn(VII). Sorbent was isolated from aqueous phase by an external magnet. Mn(II) in upper solution from MDMSPE was further enriched by SFODME. This method avoids tedious pre-oxidation/pre-reduction operation and time-consuming centrifugation/filtration step. An enrichment factor of 200-fold was obtained. Detection limits of this method were 0.005 and 0.007 ng mL-1 for Mn(II) and Mn(VII) with relative standard deviations of 4.0% and 4.8% (n = 9), respectively. This method was successfully used for detection of Mn(II) and Mn(VII) in tap water, ice tea, energy drink, mineral water, sprite drink and carbonated drink. A certified reference material of water sample was analyzed with satisfactory results. Recoveries of spike experiments ranged from 92.5 to 106%.
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