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Electrospun nanofibrous mercury filter: Efficient concentration and determination of trace mercury in water with high
Huaming Wang1, Wenyao Huang1, Lin Tang1
1Hubei Provincial Key Laboratory of Heavy Metal for Food Safety Risk Assessment, Hubei Provincial Key Laboratory for Applied Toxicology, Institute of Health Inspection and Testing, Hubei Provincial Center for Disease Control and Prevention, Wuhan 430079, China.
Abstract:
Herein, we reported a simple and highly sensitive method for the concentration and determination of trace mercury in water samples based on a novel electropsun nanofibrous mercury filter (ENMF). The method consisted of two simple steps: first, the concentration of mercury on a piece of thiol-containing ENMF; and second, the determination of mercury captured on the ENMF using a direct mercury analyzer (DMA). By changing the volume of water sample, the dynamic range of the method could extend from 0.0025 to 6.0 ng/mL with the lowest limit of detection (LOD) of 2.5 pg/mL (2.5 ppt, 12.5 pM). The proposed method exhibited good precision with the relative standard deviations (RSDs, n = 11) of 9.4%, 5.5%, and 3.7% at the concentrations of 0.01, 0.1 and 1.0 ng/mL, respectively, as well as satisfying accuracy for the analysis of certified reference materials (GSB 07-3173-2014 202033 and GBW 08603). The proposed method showed good agreement with the Chinese AFS standard method (GB/T 5750.6) in the measurement of three different real water samples, with the relative errors of -6.2-2.6% and standard addition recoveries of 90.6-108.2%. This strategy provided a simple and efficient approach to the highly sensitive determination of trace mercury in water, and extended the application of electrospun nanofibrous membranes for environmental pollutant analysis.
