Silver-organic coordination networks for magnetic solid-phase extraction of trihalomethanes from environmental water...

Trihalomethanes (THMs) are the primary toxic and carcinogenic byproducts during disinfection of drinking water. THMs have been frequently detected in water body and posed a huge threat to human health. Thus, analyzing the trace levels of THMs in an accurate and rapid method for water quality monitoring is important. In this paper, silver-based organic coordination networks (Ag-OCN) were fabricated with different diameters under mild pH condition. After modification with magnet, Fe₃O₄ @ Ag-OCN as extractant was applied to the magnetic solid-phase extraction of THMs from water samples. Gas chromatography-tandem mass spectrometry was used for sample quantification and detection. The magnetic extractant displayed good linearity in the range of 0.03-10 ug/L, low limits of detection (1.41-10.13 ng/L), and good reproducibility (relative standard deviations < 6.31%). Moreover, density-functional theory (DFT) calculation was also applied to investigate the possible interaction mechanism. Combining the experimental data with theoretical calculation, results showed that Fe₃O₄ @ Ag-OCN was a potential magnetic material for the enrichment and extraction of formed THMs at trace levels from water samples.