Time-lapse self-potential signals from microbial processes: A laboratory perspective

IF 2.2 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Journal of Applied Geophysics Pub Date : 2024-07-10 DOI:10.1016/j.jappgeo.2024.105448
Youjun Guo , Yi-an Cui , Chi Zhang , Jing Xie , Pengfei Zhang , Lijuan Zhang , Chuanghua Cao , Jianxin Liu
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Abstract

Microorganisms play a critical role in hydrocarbon degradation, contaminant sequestration, and pollution monitoring. However, the complex relationships between microbial processes and geological media's physical and chemical properties remain ambiguous. The self-potential (SP) is an efficient, low-cost, and nonintrusive passive geophysical technique suitable for monitoring dynamic activities. Herein, we conducted the 3D monitoring experiments to obtain time-lapse SP signals generated from cultivating typical microorganisms (Shewanella oneidensis MR-1) under laboratory-controlled conditions. The 3D multi-channel SP experimental devices enable dynamic monitoring and measurement of weak signals. At the beginning of the experiment, we observed a rapid increase in SP signals that consist mainly of the streaming potential and the redox potential. The peak values of negative anomalies monitored in the two experiments were − 75.9 mV and − 59.5 mV, respectively. During subsequent monitoring, the abnormal potential signal gradually decreased. After a sufficient period, the amplitude of the SP generated solely by the Shewanella oneidensis MR-1 activities ranged from −45 to −35 mV. Our laboratory research paves the way for developing dynamic model data to link the self-potential response with microbial processes. Then, we inverted the measured SP data to obtain the current source density distribution. The consistency of current density results and anomalous potentials shows that SP data collected by pre-buried non-polarizable electrodes can be utilized as a direct indicator signal for spatiotemporal monitoring of microbial activities. The SP method shows promise in environmental bioremediation and biodegradation.

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微生物过程的延时自电势信号:实验室视角
微生物在碳氢化合物降解、污染物封存和污染监测方面发挥着至关重要的作用。然而,微生物过程与地质介质物理和化学性质之间的复杂关系仍然模糊不清。自电位(SP)是一种高效、低成本、非侵入式的被动地球物理技术,适用于监测动态活动。在此,我们进行了三维监测实验,以获取在实验室控制条件下培养典型微生物(Shewanella oneidensis MR-1)所产生的延时 SP 信号。三维多通道 SP 实验装置可对微弱信号进行动态监测和测量。实验开始时,我们观察到 SP 信号迅速增加,主要由流电位和氧化还原电位组成。两次实验中监测到的负异常峰值分别为 - 75.9 mV 和 - 59.5 mV。在随后的监测过程中,异常电位信号逐渐减弱。经过足够长的一段时间后,仅由 Shewanella oneidensis MR-1 活动产生的 SP 的振幅在 -45 至 -35 mV 之间。我们的实验室研究为开发动态模型数据,将自电位反应与微生物过程联系起来铺平了道路。然后,我们将测得的 SP 数据进行反演,以获得电流源密度分布。电流密度结果与异常电位的一致性表明,通过预埋非极化电极收集的自电势数据可用作微生物活动时空监测的直接指示信号。SP 方法在环境生物修复和生物降解方面大有可为。
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来源期刊
Journal of Applied Geophysics
Journal of Applied Geophysics 地学-地球科学综合
CiteScore
3.60
自引率
10.00%
发文量
274
审稿时长
4 months
期刊介绍: The Journal of Applied Geophysics with its key objective of responding to pertinent and timely needs, places particular emphasis on methodological developments and innovative applications of geophysical techniques for addressing environmental, engineering, and hydrological problems. Related topical research in exploration geophysics and in soil and rock physics is also covered by the Journal of Applied Geophysics.
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