Figure 7

(a) SW-ASV voltammograms of Zn(II) obtained with PAA-g-PVDF nanoporous membrane-electrodes after a preconcentration step by adsorption of 30 min in standard Zn(II) water solutions and subsequent measurement in 0.1 M buffered acetate, pH 5; (b) Obtained calibration curve in the extended concentration range of 10–1000 \(\upmu \)g L\(^{-1}\) (ppb) around OSPAR threshold for Zn in the case of production water from offshore petroleum platform.