Facile green synthesis of magnetic porous organic polymers for fast preconcentration of trace lead and mercury from environmental water followed by graphite furnace atomic absorption spectrometry detection

Magnetic porous organic polymers (MPOPs) was synthesized in aqueous phase under mild condition by using Fe3O4@SiO2 nanoparticles as magnetic core, 1,3,5-tris-(4-aminophenyl) benzene (TAPB) and 4-(2-pyridylazo) resorcinol (PAR) as two building blocks. The resultant materials (denoted as TAPB-PAR-MPOPs) have the fea-tures of good magnetism, high porosity and large surface area, and fast adsorption kinetic (8 min) as well as high adsorption capacities (319 and 374 mg g(-1), respectively) toward lead and mercury ions. With the prepared TAPB-PAR-MPOPs as sorbent, a method of magnetic solid phase extraction coupled with graphite furnace atomic absorption spectrometry was developed for the determination of trace lead and mercury in environmental water samples. Under the optimal conditions, the detection limits were 0.009 and 0.017 mu g L-1 for lead and mercury, respectively. The developed method was successfully applied to the analysis of trace lead and mercury in tap water, lake water and river water samples with satisfactory recoveries (88.3-107%), demonstrating a good potential of TAPB-PAR-MPOPs in extraction of trace lead and mercury in environmental waters.

Automated summary

A magnetic porous organic polymer (MPOPs) with good magnetism, high porosity, and large surface area was synthesized in aqueous phase. This material showed fast adsorption kinetics and high adsorption capacities towards lead and mercury ions. A magnetic solid phase extraction method coupled with graphite furnace atomic absorption spectrometry was developed for trace lead and mercury determination in environmental water samples using the prepared MPOPs as a sorbent. The method exhibited low detection limits and satisfactory recoveries.