Kinetic investigation of galvanic dissolution of ZnS and PbS with FeS2 from hydrothermal sulfides in seawater

Sulfide mineral dissolution is an important reaction controlling geochemical and environmental chemical processes in aqueous environments. In this study, we quantitatively evaluated the kinetic influence of galvanic interactions between different sulfide minerals on their seawater. Four hydrothermal sulfides with amounts Fe disulfide (pyrite) were reacted artificial seawater for 144 h, rates Zn Pb determined by extraction method. The from samples high Fe/Zn molar ratios (>0.26) 1.3–1.5 × 10?10 mol m?2 s?1; approximately one order magnitude higher than those low (<0.002; 1.6–1.8 10?11 s?1). a sample nine orders (8.4× s?1) reference data single galena rate (8.9 10?19 solubility PbSO4 PbS PbCO3 could explain intense release other samples. These results mineralogical observations X-ray diffraction, photoelectron spectroscopy, electron probe micro-analysis particulates provide evidence selective anodic (e.g., sphalerite galena) at cathodic pyrite).