Figure 9

Square-wave anodic stripping voltammograms obtained using a PAA-g-PVDF membrane-electrode in 80 mL of: (1) raw production waters (grey and black curves—duplicate experiments); (2) a presorbed production water which was already in contact for 30 min with a PAA-g-PVDF membrane-electrode (green curve); (3) a 1 ppm Zn(II) spiked presorbed production water (red curve).