Arsenic uptake in bacterial calcite

被引:25
作者
Catelani, Tiziano [1 ,2 ]
Perito, Brunella [3 ]
Bellucci, Francesco [1 ]
Lee, Sang Soo [4 ]
Fenter, Paul [4 ]
Newville, Matthew [5 ]
Rimondi, Valentina [1 ]
Pratesi, Giovanni [1 ]
Costagliola, Pilario [1 ]
机构
[1] Univ Firenze, Earth Sci Dept, Via G La Pira 4, I-50126 Florence, Italy
[2] Fdn Ist Italiano Tecnol, Elect Microscopy Facil, Via Morego 30, I-16163 Genoa, Italy
[3] Univ Firenze, Biol Dept, Via Madonna Piano 6, I-50019 Sesto Fiorentino, FI, Italy
[4] Argonne Natl Lab, Chem Sci & Engn Div, 9700 South Cass Ave, Argonne, IL 60439 USA
[5] Univ Chicago, Argonne Natl Lab, GSECARS, 9700 South Cass Ave, Argonne, IL 60439 USA
基金
美国国家科学基金会;
关键词
Bacterial calcite; Arsenic; X-ray diffraction; X-ray absorption spectroscopy; As speciation; Travertine; STRUCTURE REFINEMENTS; CARBONATE; SPECTROSCOPY; ADSORPTION; SORPTION; GROWTH; IRON; BIOMINERALIZATION; COPRECIPITATION; PRECIPITATION;
D O I
10.1016/j.gca.2017.11.013
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Bio-mediated processes for arsenic (As) uptake in calcite were investigated by means of X-ray Diffraction (XRD) and Xray Absorption Spectroscopy (XAS) coupled with X-ray Fluorescence measurements. The environmental bacterial strain Bacillus licheniformis BD5, sampled at the Bullicame Hot Springs (Viterbo, Central Italy), was used to synthesize calcite from As-enriched growth media. Both liquid and solid cultures were applied to simulate planktonic and biofilm community environments, respectively. Bacterial calcite samples cultured in liquid media had an As enrichment factor (Kd) 50 times higher than that from solid media. The XRD analysis revealed an elongation of the crystal lattice along the c axis (by 0.03 angstrom) for biogenic calcite, which likely resulted from the substitution of larger arsenate for carbonate in the crystal. The XAS data also showed a clear difference in the oxidation state of sorbed As between bacterial and abiotic calcite. Abiotic chemical processes yielded predominantly As(V) uptake whereas bacterial precipitation processes led to the uptake of both As(III) and As(V). The presence of As(III) in bacterial calcite is proposed to result from subsequent reduction of arsenate to arsenite by bacterial activities. To the best of our knowledge, this is the first experimental observation of the incorporation of As(III) in the calcite crystal lattice, revealing a critical role of biochemical processes for the As cycling in nature. (C) 2017 Elsevier Ltd. All rights reserved.
引用
收藏
页码:642 / 654
页数:13
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