Distinguishing Biotic and Abiotic Iron Oxidation at Low Temperatures
Distinguishing Biotic and Abiotic Iron Oxidation at Low Temperatures
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DOI：
10.1021/acsearthspacechem.9b00016
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发表时间：
2019-05
影响因子：
3.4
通讯作者：
Brian St Clair;J. Pottenger;R. Debes;K. Hanselmann;E. Shock
中科院分区：
文献类型：
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作者：
Brian St Clair;J. Pottenger;R. Debes;K. Hanselmann;E. Shock
在瑞士阿尔卑斯山的各种寒冷（T = 9-12 °C）、环中性（pH = 5.5-9.0）环境中测定了微生物和非生物铁氧化的速率。这些栖息地包括铁碳酸氢盐泉、铁砷碳酸氢盐泉和高山湖泊。微生物的铁氧化率进行了测量，pH值为7.4，只有非生物过程中检测到较高的pH值。在检测到生物铁氧化的位置，铁氧化细菌（FeOB）占净氧化率的39-89%。推定的铁氧化属的成员，特别是Gallionella，是丰富的系统中，生物铁氧化进行了测量。伴随每个实验的地球化学采样套件包括现场数据（温度，pH值，电导率，溶解氧和氧化还原敏感溶质），溶质浓度和沉积物成分。溶解的无机碳浓度表明碳酸氢根和碳酸根通常是这些系统中最丰富的阴离子。特别...
The rates of microbial and abiotic iron oxidation were determined in a variety of cold (T = 9–12 °C), circumneutral (pH = 5.5–9.0) environments in the Swiss Alps. These habitats include iron–bicarbonate springs, iron–arsenic–bicarbonate springs, and alpine lakes. Rates of microbial iron oxidation were measured up to a pH of 7.4, with only abiotic processes detected at higher pH values. Iron oxidizing bacteria (FeOB) were responsible for 39–89% of the net oxidation rate at locations where biological iron oxidation was detected. Members of putative iron oxidizing genera, especially Gallionella, are abundant in systems where biological iron oxidation was measured. Geochemical sampling suites accompanying each experiment include field data (temperature, pH, conductivity, dissolved oxygen, and redox sensitive solutes), solute concentrations, and sediment composition. Dissolved inorganic carbon concentrations indicate that bicarbonate and carbonate are typically the most abundant anions in these systems. Specia...