|
Abstract
|
In this work, a novel thin film based on ZnO nanoparticles (ZnO NPs) incorporated into polyamide (PA) has
been designed and prepared. For this purpose, the ex situ prepared ZnO NPs were dispersed into PA
solution and the obtained solvent blend was deposited onto cellulose paper applying a solvent exchange
method. The characterization of the prepared ZnO NPs/PA nanocomposite was performed applying
energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD) and scanning electron microscopy
(SEM). The prepared thin film based on ZnO NPs/PA/cellulose paper was employed for ultrasound
assisted thin film microextraction (USA-TFME) of some organophosphorous pesticides (OPPs) as model
compounds including fenthion, chlorpyrifos, fenithrothion, phosalone, edifenphos and ethion in
environmental water samples followed by gas chromatography-flame ionization detection (GC-FID)
determination. The effect of the level of ZnO NP doping into the prepared nanocomposite on the
extraction efficiency of the thin film was studied. The important parameters influencing the extraction
and back-extraction steps of USA-TFME were optimized by applying a Taguchi orthogonal array design.
The limits of detection (LODs) for the developed method were in the range of 0.05 to 0.3 ng mL1 and
its linear dynamic ranges (LDRs) were 0.2–1000, 0.3–1000 and 1–1000 ng mL1 for different analytes.
The method precision (RSD%) with three replicates was in the range of 2.1 to 9.8% using spiked distilled
water (100 ng mL1).
|