Siderophores, high-affinity Fe(III) ligands produced by microorganisms to facilitate iron acquisition, might contribute significantly to dissolved Fe(III) complexation in ocean surface waters. In previous work, we demonstrated the photoreactivity of the ferric ion complexes of several a-hydroxy carboxylic acid–containing siderophores produced by heterotrophic marine bacteria. Here, we expand on...

In most aquatic systems, natural organic acids constitute an important pool of trace-metal binding ligands. The effect of natural organic matter (NOM) on metal ion sorption to mineral surfaces is a complex function of the environment in which the mineral and ions reside, as well as the source, molecular weight distribution and composition of the NOM. In spite of the well-acknowledged importance...

dynamically stable redox state under oxidizing conditions in soils. The constant capacitance model, a chemical surface complexation Arsenate adsorption on soils and soil minerals has model, was applied to arsenate, As(V), adsorption on 49 soils selected been described using various modeling approaches. Such for variation in soil properties. The constant capacitance model was able to fit arsenat...

Coulombic interactions between charged species in pore water and at surface/solution interfaces are of pivotal importance for multicomponent reactive transport porous media. In this study, we investigate the impact domain dimensionality on electrostatically coupled dispersion surface-solution reactions during acidic plumes major ions Column quasi two-dimensional flow-through experiments were pe...

Synthetic noncrystalline aluminosilicates with variable charge, similar to allophanes present naturally in volcanic soils, were studied. The surface charge behavior was determined by zero point charge (ZPC) measured by electrophoretic mobility (isoelectric points, IEP) and determined by potentiometric titration (point of zero salt effect, PZSE). The ZPC calculated by Parks model (ZPC(c)), compa...