Biogeochemical Aspects of Transformation of Humic Substances and Silicate Rocks during Freezing–Thawing

IF 0.7 4区 地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS
L. M. Kondratyeva, D. V. Andreeva, E. M. Golubeva, Z. N. Litvinenko
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引用次数: 0

Abstract

In the northern regions, seasonal temperature fluctuations cause cyclic thawing and freezing of soils and rocks, which is accompanied by dangerous natural phenomena, including landslides. Special conditions arise on the mountain slopes of many reservoirs due to the fluctuations of water levels and the interaction of humified waters with rocks. The paper presents the results of an experimental study of the biotransformation of sodium humate (SH) and changes in the microstructure of the surface of silicate rock that is a part of the Bureya landslide body under various conditions of cyclic freezing–thawing (CFT). Freezing of samples was carried out at a temperature of –18°C, and thawing at different temperature ranges (+4 and +23°C). The role of biogenic factor was played by four strains of microorganisms isolated from the surface and bottom waters in the Bureya Reservoir above and below the landslide body. The nature of the SH biotransformation during CFT was studied by spectral methods at different wavelengths (254, 275, and 465 nm). Analysis of the composition of water-soluble forms of chemical elements in an aqueous environment during rock destruction was carried out by ICP-MS, and changes in the surface microstructure was studied using scanning electron microscopy. It was found that the aromatic component of SH was subjected to the most intense transformation. After CFT, the strain Actinomyces sp. 45VD isolated from bottom waters showed maximum activity at a thawing temperature of +4°C relative to SH and leaching of elements from rock (Al, Ca, Mg, Mn). Its activity was comparable to the intensity of element leaching by a natural microbial consortium of non-sterile rock. Rocks subjected to CFT in deionized water were used for comparison; in this case, the content of water-soluble forms of many chemical elements (Fe, Ni, Cu, Zn, As, Mo, Ag, Cd, Tl, Bi, As) was below the detection limits (<0.001). The high biogeochemical activity of Actinomyces sp. 45VD is confirmed by the analysis of SEM-images of the microstructure of the silicate rock surface and the formation of a wide variety of isomorphic biominerals.

Abstract Image

Abstract Image

冻融过程中腐殖质和硅酸盐岩转化的生物地球化学问题
摘要 在北方地区,季节性的温度波动导致土壤和岩石周期性解冻和冻结,随之而来的是危险的自然现象,包括山体滑坡。由于水位的波动和腐殖质水与岩石的相互作用,许多水库的山坡上出现了特殊情况。本文介绍了对腐植酸钠(SH)的生物转化以及布列亚(Bureya)滑坡体部分硅酸盐岩表面微观结构在各种循环冷冻-解冻(CFT)条件下的变化进行实验研究的结果。样品在-18°C的温度下冻结,在不同的温度范围(+4 和 +23°C)下解冻。从滑坡体上方和下方的布雷亚水库表层和底层水体中分离出的四种微生物菌株发挥了生物因子的作用。通过不同波长(254、275 和 465 纳米)的光谱方法研究了 CFT 期间 SH 生物转化的性质。利用 ICP-MS 分析了岩石破坏过程中水溶液环境中化学元素的组成,并利用扫描电子显微镜研究了表面微观结构的变化。结果发现,SH 的芳香族成分发生了最强烈的转变。在 CFT 之后,从底层水分离出来的放线菌 45VD 菌株在解冻温度为 +4°C 时相对于 SH 和从岩石中沥滤元素(Al、Ca、Mg、Mn)表现出最大的活性。其活性与非无菌岩石的天然微生物群的元素沥滤强度相当。在这种情况下,许多化学元素(Fe、Ni、Cu、Zn、As、Mo、Ag、Cd、Tl、Bi、As)的水溶性含量都低于检测限(<0.001)。硅酸盐岩表面微观结构的扫描电镜图像分析以及多种同形生物矿物的形成证实了放线菌 45VD 的高生物地球化学活性。
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来源期刊
Geochemistry International
Geochemistry International 地学-地球化学与地球物理
CiteScore
1.60
自引率
12.50%
发文量
89
审稿时长
1 months
期刊介绍: Geochemistry International is a peer reviewed journal that publishes articles on cosmochemistry; geochemistry of magmatic, metamorphic, hydrothermal, and sedimentary processes; isotope geochemistry; organic geochemistry; applied geochemistry; and chemistry of the environment. Geochemistry International provides readers with a unique opportunity to refine their understanding of the geology of the vast territory of the Eurasian continent. The journal welcomes manuscripts from all countries in the English or Russian language.
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