Journal
RADIATION PHYSICS AND CHEMISTRY
Volume 118, Issue -, Pages 48-54Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.radphyschem.2015.03.011
Keywords
Track-etched membrane; Vinylpyridine; Irradiation; Radiografting; Mercury detection
Funding
- RTRA [2009-042T-ASSENSOR]
- OSEO [A1006069Q]
- CEA TECHNOSANTE
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By a radiation-induced grafting technique, we have functionalized track-etched nanoporous polymer membranes with mercury sensitive poly-4-vinyl pyridine (P4VP). Coating of these membranes with a very thin layer of gold results in an electrochemical sensor that is very selective and highly sensitive for mercury LOD 5 ng/L - well below the norms for water (0.015 mu g/L potable water and 0.5 mu g/L residual waters-French water norms of 27 October 2011). E-beam irradiation permitted optimization of the radiografting synthesis on PVDF thin films prior to ion-track grafting. Synthesis and characterization by EPR, FESEM and FTIR are described in detail. A comparison between FOR in ATR and transmission modes enabled us to localize the grafting on the surface of the e-beam irradiated PVDF films allowing us to extrapolate what happens on the etched tracks. Using Square Wave Anodic Stripping Voltammetry (SW-ASV), mercury concentrations of 1 mu g/L are detected in 2 h and low ng/L concentrations are detected after 24 h of adsorption. The adsorption is passive so sensors do not require instrumentation and the analysis takes only 3-4 min. Also, the P4VP functionalized sensor appears insensitive to pH variations (pHs 3-9), high salt concentrations (up to 1 g/L) and the presence of other heavy metals in the same solution. (C) 2015 Elsevier Ltd. All rights reserved.
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