β-FeOOH · Cln (akaganéite) and Fe1-xO (wüstite) in hot brine from the Atlantis II Deep (Red Sea) and the uptake of amino acids by synthetic β-FeOOH · Cln |
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| Authors: | Nils G Holm Michael J Dowler Tommy Wadsten Gustaf Arrhenius |
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| Institution: | University of Stockholm, Department of Geology, S-106 91 Stockholm, Sweden;Department of Natural Science, San Diego State University, San Diego, CA 92182, USA;University of Stockholm, Department of Inorganic Chemistry, S-106 91 Stockholm, Sweden;Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA 92093, USA |
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| Abstract: | A yellowish brown precipitate in samples of Red Sea hot brine has been identified as β-FeOOH · Cln (akaganéite) by Guinier-Hägg X-ray diffraction techniques, transmission electron microscopy (TEM), electron diffraction and electron excited X-ray fluorescence. Microcrystals of Fe1-xO (wüstite) were also identified by electron diffraction. Synthetic β-FeOOH · Cln characterized by the same techniques was identical with the brine precipitate.Bonding between β-FeOOH · Cln and 14C labeled amino acids is pH dependent: between pH 3 and pH 7.6 amino acids were bound to the extent of 40 to 60% or 0.6 to 0.9 mmol per kg of iron oxide hydroxide. Some selectivity in affinity for different amino acids was observed, however, the effect is insufficient to explain the unusual distribution in the Atlantis II Deep brine reported in the literature. |
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