On-line concentration using a magnetic molecularly imprinted sorbent and GC-MS determination of bisphenol A in natural media
Abstract
Studies that propose methods for concentrating various substances under dynamic conditions using magnetic sorbents are relevant.
In this study we investigated concentration under dynamic conditions using a molecularly imprinted sorbent (Fe3O4@MIP-BPA) with imprints of bisphenol A (BPA) for its subsequent determination in waters, soils and bottom sediments at the level of ultra microquantities.
Designed, original stand installation, based on online magnetic solid phase extraction principles was developed. The installation includes a borosilicate glass column filled with Fe3O4@MIP-BPA, which is fixed with two neodymium magnets. In comparison with the use of a single magnet, the dual magnet design ensures that the sorbent is evenly distributed over the entire cross section of the column. The highest enrichment factors (EF=3216) and the degree of BPA desorption from the column were achieved for the volumetric filtration rate (W) 2.0 cm3/min and for W=0.4 cm3/min for the elution with methanol.
The GC-MS determination of BPA in concentrates from model media ensures the high sensitivity of the developed method for the determination of BPA. For the analysis of model solutions prepared in distilled water, the limit of detection (LOD) is 0.3 ng/dm3. In the analysis of river water, the LOD increases by about 2 times. In the analysis of soils, LOD=2.2 ng/kg dry wt. Soils, in comparison with water bodies, contain a greater amount of interfering components, the sensitivity of the method is reduced by 7-8 times. The bottom sediments are even more polluted, the LOD increases by more than 2 times in comparison with the determination of BPA in soils.
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