Figure 6From: Formation of Zn- and Fe-sulfides near hydrothermal vents at the Eastern Lau Spreading Center: implications for sulfide bioavailability to chemoautotrophsZn concentration as determined by anodic stripping voltammetry in model Zn-sulfide solutions containing 2 μM ZnS, 2 μM ZnS + 2.5 μM cysteine (CYS), and 2 μM Zn + 2.5 μM CYS (all model solutions prepared in 0.1 M KCl, 4 mM HEPES buffer, pH 7.6). (a) ASV-labile Zn in unfiltered solutions before and after addition of 0.5 μM Cu(II). Addition of Cu(II) caused oxidative dissolution of ZnS; (b) ASV-labile and total Zn quantified in filtered (< 0.2 μm) solutions.Back to article page