A magnetic stirring
device allowing semidispersive solid phase
extraction of eight bisphenols (A, AF, AP, C, BP, G, M, and Z) from
river waters using polymer nano- and microfibers followed by HPLC
with spectrophotometric detection has been developed and applied.
About 50 mg of fibers was placed in a round, cage-like housing consisting
of two identical 3D printed pieces that were locked together by a
magnetic stirring bar. Magnetic stirring action of the cage devices
enabled highly efficient interaction of the fibers housed inside with
the aqueous samples and analyte transfer without risking fiber compaction
and/or damaging. Polypropylene was found to be the best-suited filament
material for the cage 3D printing, and polycaprolactone fibers appeared
the most efficient sorbent out of eight tested polymers. Experimental
design revealed that analytes extraction from 100 mL aqueous samples
was completed within 50 min and stripping in methanol required less
than 35 min. Cage housing enabled simple and robust handling of the
fibrous sorbent that could be used repeatedly up to at least 5 times.
Procedural repeatability was less than 5% RSD, and limits of detection
and quantitation were 0.1–2.1 and 0.4–7.0 μg L–1, respectively. Analyte recoveries at 50 μg
L–1 level ranged from 87.1% to 106.5% in the analysis
of two spiked river and two lake waters.
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