Characterization of salt crystals in soil using electrochemical measurements

IF 2.5 4区工程技术 Q2 ENGINEERING, MECHANICAL

Journal of Porous Media Pub Date : 2024-07-01 DOI:10.1615/jpormedia.2024052860

Ferid Mezdari, Walaeddine Maaoui, Faycel Tiss, Mustapha Najjari, Kamel Khirouni, Noureddine Hamdi

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引用次数: 0

Abstract

Soil salinization is considered among the most serious problems that affect irrigated lands and, thus, food security in the world. It is interesting to develop methods to test soil salinization. In this paper, the electric properties of sand-salt crystals (NaCl) mixtures (SSM) are investigated using electrical impedance spectroscopy. Seven samples were considered by mixing dry sand and salt crystals with different salt mass percentages (SMP) from 0% to 100%. The electrical responses are explored by measuring the electrical impedance and the global conductance for different SSM filling a small capacitive cell. The influence of frequency and SMP on the electrical conductance and the complex impedance are investigated. It was found that the conductance shows high dispersion with SMP at the whole frequency range and a high dispersion with frequency at low and high frequencies (≤103Hz and ≥105Hz). Impedance diagrams show a frequency dispersion at high and low frequencies that is modeled by an equivalent circuit constituted of three dipoles in series, each one formed by a pure resistance and a constant phase element in parallel. Findings characteristics are directly related to the rate of salt crystals in the samples. Then, the method developed in this work constitutes a non-destructive technique for detecting salt crystals in soils in arid regions and can be used to develop devices for in situ measurements.

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利用电化学测量法确定土壤中盐晶体的特征

土壤盐碱化被认为是影响灌溉土地，进而影响世界粮食安全的最严重问题之一。开发测试土壤盐碱化的方法很有意义。本文使用电阻抗光谱法研究了砂盐晶体（NaCl）混合物（SSM）的电特性。通过混合干砂和盐晶体（盐的质量百分比从 0% 到 100% 不等），研究了七种样品。通过测量不同 SSM 在小型电容池中的电阻抗和全局电导，研究了其电气响应。研究了频率和 SMP 对电导和复阻抗的影响。研究发现，在整个频率范围内，电导率随着 SMP 的变化而高度分散，在低频和高频（≤103Hz 和≥105Hz）时，电导率随着频率的变化而高度分散。阻抗图显示了高频和低频的频率频散，该频散由三个偶极子串联构成的等效电路模拟，每个偶极子由一个纯电阻和一个并联的恒相元件构成。结果特征与样品中盐晶体的速率直接相关。因此，本研究开发的方法是一种用于检测干旱地区土壤中盐晶体的非破坏性技术，可用于开发现场测量设备。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Porous Media 工程技术-工程：机械

CiteScore

3.50

自引率

8.70%

发文量

审稿时长

12.5 months

期刊介绍： The Journal of Porous Media publishes original full-length research articles (and technical notes) in a wide variety of areas related to porous media studies, such as mathematical modeling, numerical and experimental techniques, industrial and environmental heat and mass transfer, conduction, convection, radiation, particle transport and capillary effects, reactive flows, deformable porous media, biomedical applications, and mechanics of the porous substrate. Emphasis will be given to manuscripts that present novel findings pertinent to these areas. The journal will also consider publication of state-of-the-art reviews. Manuscripts applying known methods to previously solved problems or providing results in the absence of scientific motivation or application will not be accepted. Submitted articles should contribute to the understanding of specific scientific problems or to solution techniques that are useful in applications. Papers that link theory with computational practice to provide insight into the processes are welcome.