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• W2519333557 abstract "Abstract It is widely accepted that anoxygenic photosynthetic bacteria (photoferrotrophs) oxidized dissolved Fe(II) in anoxic Archean seawater, leading to the sedimentation of cellular biomass and the Fe(III) minerals that comprised banded iron formations (BIF). However, it remains unknown to which extent the sedimented bacteria may have transported trace metals to BIF through their ability to sorb ions from seawater. We therefore chose the marine anoxygenic photoferrotroph Rhodovulum iodosum to quantify Cd 2 + , Co 2 + , Cu 2 + , Mn 2 + , Ni 2 + and Zn 2 + adsorption to bacteria/Fe(III)-oxyhydroxide composites at neutral pH and an ionic strength of 0.1 M. Acid base titration data were modeled using a linear programming optimization method to yield pK a values of 4.83 ± 0.13, 6.21 ± 0.18, 7.74 ± 0.24 and 9.28 ± 0.27 and corresponding site densities of 5.7, 12.0, 3.3 and 6.5 × 10 − 4  mol/g, respectively. FTIR spectroscopy confirmed the presence of carboxyl groups as the most acidic sites corresponding to the lowest pK a values. The analysis of Cd 2 + sorption data showed two metal complexing sites with pK S values of 3.44 ± 0.14 and 4.80 ± 0.21 and corresponding binding site concentrations of 1.1 ± 0.3 × 10 − 4 and 0.9 ± 0.2 × 10 − 4  mol/g on the ferrihydrite/ R. iodosum composite. The pK S values were used to calculate metal-ligand binding constants, K m . This confirmed Cd 2 + binding to the most acidic carboxyl groups on the ferrihydrite/ R. iodosum composite surface, as the calculated K m was consistent with reported Cd 2 + binding constants for simple organic acids (e.g., lactic, acetic, pyruvic and citric acid). This was used to further calculate the concentration of Co 2 + , Cu 2 + , Mn 2 + , Ni 2 + and Zn 2 + sorbed to ferrihydrite/ R. iodosum composites. The resulting concentrations were ultimately compared to the concentrations of trace elements in BIF to demonstrate that is plausible that the trace metal content in BIF was derived from plankton growing in the ancient ocean's photic zone." @default.
• W2519333557 created "2016-09-23" @default.
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• W2519333557 date "2016-11-01" @default.
• W2519333557 modified "2023-09-24" @default.
• W2519333557 title "Surface reactivity of the anaerobic phototrophic Fe(II)-oxidizing bacterium Rhodovulum iodosum: Implications for trace metal budgets in ancient oceans and banded iron formations" @default.
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• W2519333557 doi "https://doi.org/10.1016/j.chemgeo.2016.09.004" @default.
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