Effect of Humic Acids on the Generation of Potential Differences in a Bioelectrochemical System

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The possibility of increasing the electrogenic properties of the root environment through the use of potential electron carriers, humic acids (HA), was studied. For this purpose, a bioelectrochemical cell has been created, including electrode systems introduced into the planters to remove the potential difference formed during the development of plants. Using the example of Typhoon lettuce, it was determined that an increase in the concentration of HA in the root environment by 2 times allowed to increase the voltage by 7–16% of the control variant, depending on the place of their introduction. The best result – a more stable generation of a high potential difference from the early periods of vegetation was typical for the variant with addition of HA to the upper electrode area – the average voltage value for it was 418 ± 29 mV and a specific power of 0.2 MW/m2. A number of physicochemical parameters of near-electrode regions in plant bioelectrochemical systems have been studied: electrical conductivity, pH, concentration of humic acids at the end of the growing season. The potential electroactivity of microorganisms in the root environment of lettuce has been revealed. It is shown that the ability of humic acids to play the role of a redox mediator in a bioelectrochemical system largely depends on the place of their concentration.

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作者简介

Z. Gasieva

Agrophysical Research Institute

编辑信件的主要联系方式.
Email: melkii844@gmail.com
俄罗斯联邦, Grazhdansky prosp. 14, St. Petersburg 195220

A. Galushko

Agrophysical Research Institute

Email: melkii844@gmail.com
俄罗斯联邦, Grazhdansky prosp. 14, St. Petersburg 195220

Yu. Khomyakov

Agrophysical Research Institute

Email: melkii844@gmail.com
俄罗斯联邦, Grazhdansky prosp. 14, St. Petersburg 195220

G. Panova

Agrophysical Research Institute

Email: melkii844@gmail.com
俄罗斯联邦, Grazhdansky prosp. 14, St. Petersburg 195220

T. Kuleshova

Agrophysical Research Institute

Email: melkii844@gmail.com
俄罗斯联邦, Grazhdansky prosp. 14, St. Petersburg 195220

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2. Fig. 1. Calibration curve for determining the content of humic acids in the substrate (optical density at a wavelength of 465 nm is the average of 2 points).

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3. Fig. 2. Dynamics of the potential difference in the root–inhabited environment in BES of various compositions, options: (a) - BES–K (control without plants), (b) - BES–R (with Typhoon lettuce), (c) - BES-GC (with added GC to the substrate), (d) – BES-GCv (with added GC to the upper electrode region), (e) – BES-GCn (with added GC to the lower electrode region). The same is shown in Fig. 3.

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4. Fig. 3. The dependence of the power of the power plant on the connected load.

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