论文标题
使用共振微波光谱法在土壤和水中进行微塑料检测
Microplastic Detection in Soil and Water Using Resonance Microwave Spectroscopy
论文作者
论文摘要
使用谐振微波反射测量法对微塑性检测和定量的可行性研究是使用具有高体积浓度的微塑料的人工创建的，具有50μm-0.5mm颗粒的大小。开发了一种数学模型，该模型是在土壤和水中表达微塑性浓度的，这是所测量的S11共振频移和相对介电常数对比度的线性函数，并发现与实验数据非常吻合。接下来，使用微波传感技术在自然环境中找到最佳的微塑料浓度的理论分辨率，在线性信号检测方向上显示为100ppm（每组百万）水平。证明最佳的微型污染物分辨率的最佳水平取决于传感器探针Q因子和微波接收器的灵敏度。可实现的污染物浓度分辨率的结合以分析形式发现了高Q共振微波传感器的任意几何形状。尽管目前正在使用基于光学，红外和X射线光谱的几项建立良好的协议，以用于自然环境中的微型塑性检测，但微波光谱也可以提供额外的可能性，尤其是用于实验室空间以外不同环境条件下的低成本实时，实时的实时内部微型塑料检测。
A feasibility study of microplastic detection and quantification in soil and water using resonance microwave reflectometry is carried out using artificially created samples with high volumetric concentration of microplastic with 50μm-0.5mm particles size. A mathematical model expressing microplastic concentration in soil and water as a linear function of the measured S11 resonance frequency shift and relative permittivity contrast is developed and is found to be in a very good agreement with the experimental data. Next, this model is applied to find the best achievable theoretical resolution of microplastic concentration in the natural environment using microwave sensing technology which is shown to be at around 100ppm (parts-per-million) level in the linear signal detection regime. It is demonstrated that the best achievable level of microplastic contaminant resolution depends on the sensor probe Q-factor and sensitivity of the microwave receiver. The bound for the achievable contaminant concentration resolution is found in the analytical form for high-Q resonance microwave sensors of arbitrary geometry. Even though several well-established protocols based on optical, infrared and X-ray spectroscopy are currently being used for microplastic detection in the natural environment, microwave spectroscopy could offer additional possibilities, especially for low-cost, real-time in-situ microplastic detection in diverse environmental conditions outside of the laboratory space.
