Triazine‐based covalent organic polymer: A promising coating for solid‐phase microextraction

Abstract

Advancement of novel coating materials for solid-phase microextraction is highly needed for sample pretreatment. Herein, a triazine-based covalent organic polymer was constructed from the monomers of cyanuric chloride and transstilbene via the Friedel-Crafts reaction and thereafter used as a solid-phase microextraction fiber coating for the extraction of polycyclic aromatic hydrocarbons and their nitrated and oxygenated derivatives. The newly-developed solidphase microextraction method coupled with gas chromatography/flame ionization detection gives enhancement factors of 548-1236 and limits of detection of 0.40-2.81 ng/L for the determination of polycyclic aromatic hydrocarbons and their derivatives. The one fiber precision for five replicate determinations of the analytes and the fiber-to-fiber precision with three parallel prepared fibers, expressed as relative standard deviations, was in the range of 4.6-9.4% and 6.2-10.9%, respectively. The relative recoveries of the analytes for environmental water samples were in the range of 88.6-106.4% with the relative standard deviations ranging from 4.0 to 11.7% (n = 5).

Preparation of COPs Mixed Matrix Membrane for Sensitive Determination of Six Sulfonamides in Human Urine

“…Although crystalline COFs are challenging to synthesize due to harsh reaction conditions, amorphous COPs can be easily prepared through a simple synthetic process. They have been widely applied in catalysis [29], gas absorption [30], sample pretreatment [31], and drug delivery [32]. The existence of carbon, oxygen, and nitrogen atoms in COP blocks enhances their enrichment efficiency as the adsorbents, owing to the inter-molecular forces with target compounds [33].…”