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Determination of phenols in natural and waste waters by capillary electrophoresis after preconcentration on magnetic nanoparticles coated with aminated hypercrosslinked polystyrene
Author(s) -
Gubin Alexander,
Sukhanov Pavel,
Kushnir Aleksei,
Sannikova Natalia,
Konopleva Victoria,
Nikulina Alla
Publication year - 2021
Publication title -
journal of separation science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.72
H-Index - 102
eISSN - 1615-9314
pISSN - 1615-9306
DOI - 10.1002/jssc.202001177
Subject(s) - chemistry , sorbent , solid phase extraction , adsorption , chromatography , capillary electrophoresis , extraction (chemistry) , desorption , polystyrene , aqueous solution , phenols , elution , enrichment factor , detection limit , polymer , organic chemistry
Abstract An efficient sorbent for magnetic solid‐phase extraction was developed from Fe 3 O 4 nanoparticles covered with aminated hypercrosslinked polystyrene. The sorbent has a saturation magnetization of 47 emu/g and a surface area of 509 mg/g and was tested for the extraction of 11 phenols from aqueous media. The optimum conditions were as follows: pH 3; adsorbent mass, 20.0 mg; adsorption time, 30 min; eluent (acetone) volume, 0.5 mL; and desorption time, 5 min. The enrichment factor after desorption reached 1595‐1716 and the maximum adsorption capacity was 501‐909 mg/g. Capillary electrophoresis was applied successively to separate 11 phenols after solid‐phase extraction. The best separation was achieved using a fused silica capillary and borate buffer (pH 10.7) as a supporting electrolyte. After optimization, the linearity range was from 0.2 to 950 μg/L, and the limits of detection were 0.05‐0.2 μg/L. The relative standard deviation varied from 6.1 to 8.7% ( C = 1 μg/L) and from 2.9 to 3.5% ( C = 500 μg/L). The determination of phenols is complicated in eutrophic water and spring water with a high content of humic and fulvic acids.