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首页> 外文期刊>Science of the total environment >Trace element fixation in sediments rich in organic matter from a saline lake in tropical latitude with hydrothermal inputs (Sochagota Lake, Colombia): The role of bacterial communities
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Trace element fixation in sediments rich in organic matter from a saline lake in tropical latitude with hydrothermal inputs (Sochagota Lake, Colombia): The role of bacterial communities

机译：含有热带纬度的盐水沉积物中沉积物的痕量元素固定与水热投入（苏格兰湖，哥伦比亚）：细菌社区的作用

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摘要

We studied the relationships between the trace element concentration in sediments from a saline lake at a tropical latitude (Sochagota Lake, Colombia) containing hydrothermal and anthropic inputs with the organic matter content, the mineral assemblage composition and the activity of the bacterial communities of the sediments. Organic matter-poor sediments (TOC ＜ 0.7%) with quartz and kaolinite near the southern entrance of the lake were enriched in Zr (up to 603 mg/kg) and some major detrital elements (Na, Ti, Al and Si). Fine-sized day-rich sediments deposited in the deep zones of the lake (central and northern segments) were characterized by substantial organic matter (up to 11.10%) and the crystallization of S-bearing minerals, clay mineral mixed layers and illite. These sediments were enriched in S, Fe, Zn, Mo, Rb, Co, K, Cr, Sb, Ni, As, Ba, Cu, Mn, Pb, P, Mg, and Sr. The presence of Fe sulfide nanoparticles enriched in heavy metals encrusting microbial cells and a dominant sulfate-reducing bacteria (SRB) community (Desulfatiglans, Desulfobacterales and Sva0485) suggested that the precipitation of the hydrothermal S and the accumulation of trace elements in the sediments was regulated by SRB activity. The crystallization of S°, barite and calcite and the good correlations between Ba, Sr and Ca indicated that previously precipitated sulfide can be oxidized by the activity of a relevant sulfur-oxidizing bacterial community (Thioalkalimicrobium, Sulfurovum, Arcobacter and Sulfurimonas), possibly facilitating the release of the metals.
机译：我们研究了在热带纬度（苏格兰湖，哥伦比亚）的盐水湖中沉积物之间的痕量元素浓度与有机物质含量，矿物组合组合物和沉积物细菌群落的活性的盐水湖之间的关系。在湖南南部南部的石英和高岭土中有机质 - 沉积物（TOC <0.7％）富含Zr（高达603mg / kg）和一些主要卵形元素（Na，Ti，Al和Si）。通过大量有机物质（高达11.10％）和S轴承矿物，粘土矿物混合层和伊尔硫铁矿的含量沉积在湖泊（中央和北部段的深层）中沉积在湖泊（中央和北部区段）的细小的沉积物。这些沉积物富含S，Fe，Zn，Mo，Rb，Co，K，Cr，Sb，Ni，作为Ba，Cu，Mn，Pb，P，Mg和Sr。富含Fe硫化物纳米粒子的存在重金属结壳微生物细胞和优势硫酸盐还原细菌（SRB）群落（SRB）群落（脱硫油，脱硫和SVA0485）表明，通过SRB活性调节水热量沉淀和沉积物中的微量元素的积累。 S°，重晶石和方解石的结晶以及Ba，Sr和Ca之间的良好相关性，表明先前沉淀的硫化物可以通过相关的硫 - 氧化细菌群落（硫代甲酸粒细胞，硫虫，arcobacter和硫纤米）的活性来氧化，可能促进金属的释放。

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