Detection and analysis of soil contaminants by terahertz time-domain spectroscopy

Meihui Yang; Caiqin Liu; Dongshun Zhang; Zili Zhang; Zhiyuan Zheng; Haochong Huang

doi:10.1117/12.2607064

1 November 2021 Detection and analysis of soil contaminants by terahertz time-domain spectroscopy

Meihui Yang, Caiqin Liu, Dongshun Zhang, Zili Zhang, Zhiyuan Zheng, Haochong Huang

Proceedings Volume 12057, Twelfth International Conference on Information Optics and Photonics; 120574T (2021) https://doi.org/10.1117/12.2607064
Event: Twelfth International Conference on Information Optics and Photonics, 2021, Xi'an, China

Abstract

In this work, the optical properties of several inorganic contaminants and organic pollutants in soil were characterized by using terahertz time-domain spectroscopy, such as heavy metals and microplastics. The main purpose of the present investigation is to provide a new technical approach for assessing the degree of soil pollutions and remediation. Terahertz wave is a kind of non-ionizing radiation with unique features located between microwave and infrared band. It has been widely utilized in many fields, such as the identification of heavy metals in organic pollutants heptachlor, DDT and inorganic pollutants in environmental science. Terahertz spectrum of soil samples subjected to different drying time was measured at first to explore the duration of moisture effects elimination. Based on the processing and analysis of the time-domain signal, the spectral absorption of wide band pulsed terahertz wave can be modulated by soil, hexavalent chromium and microplastics. The positive experimental results show that the absorption coefficient and refractive index of various samples corresponding to different types and proportion blends. Meanwhile, different samples have various absorption peaks in the terahertz region, which can be used to distinguish different contaminants. At the same time, the content of hexavalent chromium and the number of microplastics in the soil can be judged according to the degree of absorption. The experimental verification confirms that terahertz spectroscopy is a feasible, effective and promising method for the detection of soil pollutants with broad application prospects.

Citation Download Citation

Meihui Yang, Caiqin Liu, Dongshun Zhang, Zili Zhang, Zhiyuan Zheng, and Haochong Huang "Detection and analysis of soil contaminants by terahertz time-domain spectroscopy", Proc. SPIE 12057, Twelfth International Conference on Information Optics and Photonics, 120574T (1 November 2021); https://doi.org/10.1117/12.2607064

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KEYWORDS

Soil contamination

Absorption

Soil science

Terahertz radiation

Chromium

Terahertz spectroscopy

Refractive index

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