| 蓝藻聚铁作用的模拟实验 |
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| 引用本文： | 刘志礼,杜汝霖.蓝藻聚铁作用的模拟实验[J].地质科学,1993,28(1):79-86. |
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| 作者姓名： | 刘志礼 杜汝霖 |
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| 作者单位： | 1. 南京大学生物学系 南京 210008;2. 河北地质学院 石家庄 050031 |
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| 摘 要： | 实验模拟前寒武纪大气的高二氧化碳分压(PCO2),低氧浓度条件下,加入较低浓度(6μg/g)铁的Zarronk培养液培养蓝藻Spirulina platensis,观察铁的沉淀与凝聚。藻在生长过程中不断改变环境的离子平衡系统以及pH,Eh等,造成铁的氧化、还原、络合和Fe3+沉淀。实验组与未加蓝藻的对照组有显著差别。实验证实藻在聚铁和铁矿形成中起重要作用。
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| 关 键 词： | 蓝藻 聚铁作用 模拟实验 |
| 收稿时间： | 1991-04-01 |
| 修稿时间： | 1991-04-01; |
A SIMULATED TEST OF IRON ACCUMULATION BY BLUE GREEN ALGAE |
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| Liu Zhili Liu Xuexian Du Qinghong.A SIMULATED TEST OF IRON ACCUMULATION BY BLUE GREEN ALGAE[J].Chinese Journal of Geology,1993,28(1):79-86. |
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| Authors: | Liu Zhili Liu Xuexian Du Qinghong |
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| Institution: | 1. Department of Biology, Nanjing University, Nanjing 210008;2. Hebei College of Geology 050031 |
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| Abstract: | The relationship between algae and iron accumulation has attracted great attention for long time both in the geological and biological sciences. A vast amount of ferric sedimentary structures and algal fossils found in ferrolites have been attributed to the activity of cyanophytes.The experiments conducted in this study are designed to be dependent on the conditions that are believed to be algal specific actions for the formation of iron ore-In the experiments, Spirulina platensis were cultured under the simulated conditions of high PCo2 and low O2 concentrations, using low concentrations (Fe2+ 6μg/g) of ammonium ferrous sulfate in a controllable system.The results obtained show that algae can alter the microenvironment and modify the conditions for their continuations including the pH,the equilibrium system of ions, and redox potential during their logrithmic growth phase, thereby promoting ferric oxidation (Fe2+→Fe3+), and formation and deposition of a large amount of ferric complex compounds and other ferric compounds. Deposits and aggregates of iron on the bottom of containers can often be seen, obviously differing from the contrasts. Iron accumulated by algal adsorption and absorption can be up to 550μg/g. d.W.The experimental results indicate that algae may have played an important role in iron accumulation and ferrolite formation. |
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| Keywords: | Simulated test Blue green algae Iron accumulatio |
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