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为探索生物因素在黄龙钙华沉积过程中的作用及参与程度,本研究以黄龙水体中2株嗜冷细菌胞外特征有机酸组分——柠檬酸为研究对象,通过模拟黄龙常年水温和p H值,结合碳酸钙晶体晶型和形貌,探讨柠檬酸钙化体系中的钙化过程及柠檬酸对碳酸钙晶型和形貌的影响。结果表明:1柠檬酸浓度高、p H值低和温度低都会一定程度地抑制碳酸钙沉积;2柠檬酸浓度(20、40、80、160mg/L)对碳酸钙晶型影响不大,主要合成方解石型碳酸钙,但随着浓度的增加,伴随有花瓣状形貌的生成;3随着p H值的增大,棱柱体形貌转变为边缘较为圆滑的椭球体。综上可见,柠檬酸对碳酸钙的钙化速率、晶型和形貌具有一定的影响和调控作用,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 role and involvement of biological factors in the deposition of Huanglong travertine, two extracellular free organic acids (citric acid) of psychrophilic bacteria in Huanglong water were studied in this study. H value, combined with the crystalline form and morphology of calcium carbonate crystal, calcium citrate calcification process and citric acid on calcium carbonate crystal form and morphology. The results showed that: 1 citric acid concentration, low pH and low temperature will inhibit the calcium carbonate deposition to a certain extent; 2 citric acid concentration (20,40,80,160 mg / L) has little effect on the crystal form of calcium carbonate , Mainly calcite calcium carbonate, but with the increase in concentration, accompanied by the formation of petal-like morphology; 3 with the p H value increases, the prism morphology into a more smooth edge ellipsoid. In summary, citric acid has a certain influence and regulation on the calcification rate, crystal form and morphology of the calcium carbonate, and the results may provide a theoretical basis for the exploration of the genesis of the Huanglong travertine.