Micro-solid phase extraction based on post-modified chloro-functionalized two-dimensional covalent organic frameworks for the enrichment of organochlorine pesticides
Year: 2026
Type: article
Abstract: stacking interaction dominate the extraction and enrichment of trace OCPs on Cl-COF. The as-fabricated Cl-COF coating was combined with gas chromatography equipped with an electron capture detector （GC-ECD） to establish a novel μ-SPE-GC-ECD analytical method. Methodological validation was carried out to evaluate the analytical performance of the established method. The results demonstrated that the proposed method achieves a wide linear range for the five OCPs，with a low limit of detection of 0.20-0.42 ng/L and high enrichment factors ranging from 891 to 1 308. Satisfactory recoveries of 89.2%-104.0% and 89.0%-105.5% were obtained in two types of real water samples，and the relative standard deviations （RSDs） ranged from 1.7%-11.3% and 2.4%-12.8%，proving good accuracy，precision and anti-interference ability for complex aqueous matrices. Moreover，the composite material adheres firmly to the glass slide substrate without delamination under repeated elution and washing procedures，and no obvious decay in extraction capacity is observed after 30 consecutive adsorption-desorption cycles，demonstrating its superior structural stability and outstanding reusability. Compared with previously reported μ-SPE methods for OCPs determination，this proposed strategy exhibits better comprehensive extraction performance. This study provides feasible technical support for routine safety supervision and rapid detection of OCPs in aquatic environments.
Institution: Northwest Normal University
Language: Chinese
Subfield: Analytical Chemistry
Field: Chemistry
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7225177302