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为探索黄龙钙华的生物成因,本研究以黄龙嗜冷细菌的胞外特征有机酸组分——琥珀酸为研究对象,通过模拟黄龙水体的低温沉积环境,利用X射线粉末衍射(XRD)和扫描电镜(SEM),考察了琥珀酸对钙化体系中的钙化动力学过程、碳酸钙晶型和形貌的影响。结果表明:①高浓度琥珀酸、低pH值,低温都会在一定程度上抑制碳酸钙沉积。②高浓度琥珀酸可以诱导球霰石型碳酸钙的形成;③高温促进了体系中碳酸钙微晶的聚合。综上可见,黄龙嗜冷细菌的胞外琥珀酸组分在一定程度上参与了碳酸钙的沉积过程,对晶体的晶型和形貌具有一定的调控作用。其结果可为黄龙钙华生物成因的探究提供理论基础。
In order to explore the biological genesis of Huanglong Travertine, the extracellular organic acid component-succinic acid of psychrophilic bacteria of Huanglong was studied in this study. By simulating the low-temperature sedimentary environment of Huanglong water, X-ray powder diffraction (XRD) Scanning electron microscopy (SEM) was used to investigate the effect of succinic acid on the calcification kinetics and the morphology and morphology of calcium carbonate. The results showed that: ① high concentrations of succinic acid, low pH, low temperature will to some extent inhibit calcium carbonate deposition. ② high concentrations of succinic acid can induce the formation of vaterite calcium carbonate; ③ high temperature to promote the system of calcium carbonate microcrystalline polymerization. In conclusion, extracellular succinic acid components of the psychrophilic bacterium of Huanglong are involved in the deposition of calcium carbonate to a certain extent, and have certain regulation on the crystal form and morphology of the crystal. The results provide a theoretical basis for the exploration of the genesis of Huanglong travertine.