|
Abstract
|
A monolithic mixed matrix membrane of functionalized multi-walled carbon nanotubes-polyethersulfone
(MWCNT/PES) was prepared in a non-covalent approach and employed as an SPME fiber for extraction of
chlorophenols (CPs). The proposed extraction method was followed by GC-ECD to determine the analytes. The
influencing factors on the extraction efficiency such as pH, ionic strength, extraction and desorption temperature
and time were studied. Under the selected conditions, calibration curves were linear over a wide concentration
range from 0.005 to 1000 μgL−1 (r2 > 0.9961) for target analytes. In addition, the limits of detection (LOD) of
the method were obtained in the range of 0.3–30 ng L−1. The relative standard deviation (RSD) for single fiber
repeatability (n = 5) is from 1.4 to 4.6%. Fiber-to-fiber repeatability (n = 3) was also evaluated and the RSD is
in the range of 1.3–6.3%. Applications of proposed fiber for extraction of CPs from the headspace of urine and
serum samples were successfully investigated. The relative recovery in the biological samples spiked with different
levels of CPs were in the range of 91.6–102.5%.
|