Magnetic Sorbent with a Mesoporous Shell for the Simultaneous Preconcentration of Ecotoxicants of Different Nature |
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Authors: | M. S. Kiseleva D. V. Pryazhnikov I. V. Kubrakova |
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Affiliation: | 1.Vernadsky Institute of Geochemistry and Analytical Chemistry,Russian Academy of Sciences,Moscow,Russia |
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Abstract: | A magnetic sorbent with a multilayer shell of the composition Fe3O4@TEOS@CTAB@TEOS + MPTEOS designed for the simultaneous or sequential preconcentration of components of various nature is obtained. The conditions of microwave synthesis and modification of a new magnetic sorption material are described; its composition and particle sizes are characterized. The sorption capacity of the sorbent is provided by creating a mesoporous silica layer filled with cetyltrimethylammonium bromide (CTAB) micelles and additionally modified with an S-containing polymer (MPTEOS) on the surface of the magnetic carrier. The properties of the obtained material with respect to the regulated substances from two groups of priority pollutants are studied: phenols of various structures and heavy metals. The main sorption characteristics (effect of pH, phase contact time, nature of eluent, V: m, salt background) are studied and the conditions for extracting ecotoxicants at their concentration in the solution at a level of μg/L are optimized. The data obtained under the conditions of separate and simultaneous extraction of analytes of different nature confirmed a possibility of the quantitative determination of various types of natural water pollutants at the levels significantly lower than the MPC using a single sorption material. In using HPLC methods and electrothermal atomic absorption spectrometry, a complete analysis of a single sample takes 40?50 min and of a series of samples, 2–3 h. Such characteristics, combined with the simplicity of material preparation make it promising for routine analytical studies. |
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