Development of a solid-phase microextraction fiber coated with poly(methacrylic acid-ethylene glycol dimethacrylate) and its application for the determination of chlorophenols in water coupled with GC

Abstract

A solid-phase microextraction (SPME) fiber coated with poly(methacrylic acid-ethylene glycol dimethacrylate) coupled to GC with a micro electron-capture detector was developed for the determination of four chlorphenols in water samples for the first time. A novel and simple method for the preparation of this novel SPME fiber was proposed by copolymerization of methacrylic acid and ethylene glycol dimethacrylate in an appropriate solvent using a glass capillary as a "mold". The factors affecting the polymerization were optimized in detail. Furthermore, the extraction performance of the poly(methacrylic acid-ethylene glycol dimethacrylate) fiber was evaluated. Moreover, experimental headspace-SPME parameters, such as extraction temperature, extraction time, salt concentration, stirring speed, and pH, were optimized by orthogonal array experimental designs. Under the optimized conditions, the target analytes were linear in the range of 0.2-50 ng/mL, and the correlation coefficients were all greater than 0.99. RSD was less than 8.9%, and the detection limits were in the range of 0.1-10 ng/L. Four cholorphenols were detected from tap and lake water samples using the proposed method, with the recoveries of spiked natural water samples were ranged from 91.8 to 110.8, and 90.6 to 111.4% for tap and lake water samples, respectively.

Keywords: Chlorophenol; GC; Poly(methacrylic acid-ethylene glycol dimethacrylate); Solid-phase microextraction.