1. Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, china;
2. Norendar International Ltd., Shijiazhuang 050011, China
Based on the theory of passive sampler and stir bar sorptive extraction(SBSE), a novel passive sampler with a multi-walled carbon nanotubes/polydimethylsiloxane(MWCNTs/PDMS) coating by stir bar sorptive extraction was invented to monitoring micro-pollutants in the water. In this study, phenol(PhOH), diethylstilbestrol(DES) and lead(PB) were selectedas the target pollutants to test and verify the performance of absorption capacity and optimize the adsorption conditions of this novel passive sampler. The results showed that, compared to a commercial one, our self-made passive sampler with MWCTNs/PDMS sorptive coatingcan quickly reach the adsorption equilibrium time and had greater adsorption capacity. Methanol was an optimaldesorption solution for PhOH and DES, and 0.6mol/L HNO3 was perfect for Pb. Recirculated desorption experiments show that the new passive sampler could be used more than 50times and after than the desorption efficiency can still reached more than 70%, indicating a good stability and reusability.
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