Effervescence-assisted beta-cyclodextrin/attapulgite composite for the in-syringe dispersive solid-phase extraction of pyrethroids in environmental water samples

摘要

In this research, an effervescence-assisted beta-cyclodextrin/attapulgite composite (beta-CD/ATP) for the in syringe dispersive solid-phase extraction (EAIS-DSPE) of pyrethroids in environmental samples was developed for the first time. A syringe was used to conduct the extraction procedure and a small amount of beta-CD/ATP was dispersed into the solution with the release of carbon dioxide when the effervescent tablet components dissolved in water. Then, the sorbent was recovered using a filter membrane, and the analytes were directly eluted using acetonitrile. In the process, the beta-CD/ATP sorbent resulted in an excellent extraction efficiency compared to commercially available sorbents such as C-18 and HLB. Moreover, in the extraction procedure, both the beta-cyclodextrin inclusion interactions (especially the hydrophobic effects) and the special structure of the ATP contributed to the efficient enrichment of pyrethroids in aqueous media. The amount of beta-CD/ATP sorbent, the volume of desorption, the ratio of NaH2PO4/Na2CO3, the volume of the sample, and the pH were screened using a Plackett-Burman design. All factors affecting the procedure were optimized by applying a central composite design. Under the optimized conditions, a good repeatability (RSDs) ranging from 1.7 to 2.3, linearity (2.5-500 mu g L-1), limits of detection (LODs) (0.15-1.03 mu g L-1), and an acceptable recoveries (76.8-86.5%) were achieved. Finally, the proposed method was successfully applied for the determination of pyrethroids in environmental samples including river water, reservoir water and lake water. (C) 2016 Elsevier B.V. All rights reserved.