Abstract
A novel solid-phase microextraction fiber coated with a porous β-cyclodextrin polymer was developed. The porous β-cyclodextrin polymer cross-linked using tetrafluoroterephthalonitrile, possessed well-distributed pores and the largest surface area among current β-cyclodextrin polymers. Scanning electron microscopy revealed that the coating had a continuous wrinkled and folded structure, which guarantees a sufficient loading capacity for contaminants. The properties of the developed fiber were evaluated using headspace solid-phase microextraction of five contaminants as model analytes coupled with gas chromatography-mass spectrometry. Owing to the advantages of a large surface area and three-dimensional cavities, the novel fiber exhibited excellent operational stability and extraction ability. After optimisation of the extraction conditions, including extraction temperature, extraction time, salt effect, and desorption time, validation of the method with water samples achieved good linearity over a wide range (0.01-120 μg L-1) and low detection limits (0.003-1.600 μg L-1). The single-fiber and fiber-to-fiber repeatabilities were 1.7-11.0% and 1.9-11.0%, respectively. The method was applied to the simultaneous analysis of five analytes with satisfactory recoveries (76.6-106.0% for pond water and 89.0-105.9% for rainwater).